Tecnologic TLK 94 Operating Instructions Manual - User Manual

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TLK 94

MICROPROCESSOR-BASED

DIGITAL

ELECTRONIC CONTROLLER

OPERATING INSTRUCTIONS

Vr. 01 (ENG) - 01/10

cod.: ISTR-MTLK94ENG1

TECNOLOGIC S.p.A.

VIA INDIPENDENZA 56

27029 VIGEVANO (PV) ITALY

TEL.: +39 0381 69871

FAX: +39 0381 698730

internet : http:\\www.tecnologic.it

e-mail: info@tecnologic.it

FOREWORD

This manual contains the information
necessary for the product to be installed
correctly and also instructions for its
maintenance and use; we therefore recommend
that the utmost attention is paid to the following
instructions and to save it.

This document is the exclusive property of TECNOLOGIC
S.p.A. which forbids any reproduction and divulgation , even
in part, of the document, unless expressly authorized.
TECNOLOGIC S.p.A. reserves the right to make any formal or
functional changes at any moment and without any notice.
Whenever a failure or a malfunction of the device may cause
dangerous situations for persons, thing or animals, please
remember that the plant has to be equipped with additional
devices which will guarantee safety.
Tecnologic S.p.A. and its legal representatives do not assume
any responsibility for any damage to people, things or animals
deriving from violation, wrong or improper use or in any case
not in compliance with the instrument’s features .

INDEX

INSTRUMENT ORDERING CODES

7.6

MEASURING RANGE TABLE

7.5

FUNCTIONAL DATA

7.4

MECHANICAL DIMENSIONS, PANEL CUT-OUT AND

MOUNTING

7.3

MECHANICAL DATA

7.2

ELECTRICAL DATA

7.1

TECHNICAL DATA

GUARANTEE AND REPAIRS

6.3

CLEANING

6.2

ERROR WARNINGS

6.1

PROBLEMS , MAINTENANCE AND GUARANTEE

PROGRAMMABLE PARAMETERS TABLE

PARAMETERS CONFIGURATION BY A01

4.20

RS 485 SERIAL INTERFACE

4.19

DIGITAL INPUTS

4.18

FUNCTION OF KEY “U”

4.17

LOOP BREAK ALARM FUNCTION

4.16

HEATER BREAK ALARM FUNCTION

4.15

ALARMS OUTPUTS FUNCTIONS

4.14

SOFT-START FUNCTION

4.13

REACHING OF SET POINT AT CONTROLLED SPEED

AND AUTOMATIC COMMUTATION BETWEEN TWO
SET POINTS

4.12

SPLIT RANGE FUNCTION

4.11

LIMITATION OF THE CONTROL POWER VARIATION
SPEED (MAXIMUM RATE OF RISE)

4.10

CONTROL POWER LIMITATION

4.9

AUTO-TUNING AND SELF-TUNING FUNCTIONS

4.8

PID CONTROL FOR MOTORIZED ACTUATORS WITH
TIME POSITIONING

4.7

DOUBLE ACTION PID CONTROL

4.6

SINGLE ACTION PID CONTROL

4.5

NEUTRAL ZONE ON/OFF CONTROL

4.4

ON/OFF CONTROL

4.3

OUTPUT CONFIGURATION

4.2

MEASURING AND VISUALIZATION

4.1

FUNCTIONS

ELECTRICAL WIRING DIAGRAM

3.4

ELECTRICAL CONNECTIONS

3.3

MECHANICAL MOUNTING

3.2

PERMITTED USE

3.1

INFORMATION ON INSTALLATION AND USE

ACTIVE SET POINT SELECTION

2.5

CONTROL STATES

2.4

PARAMETER PROGRAMMING LEVELS

2.3

SELECTION OF CONTROL STATE AND PARAMETERS

PROGRAMMING

2.2

FAST PROGRAMMING OF THE SET POINT

2.1

PROGRAMMING

FRONT PANEL DESCRIPTION

1.2

GENERAL DESCRIPTION

1.1

INSTRUMENT DESCRIPTION

1 - INSTRUMENT DESCRIPTION

1.1 - GENERAL DESCRIPTION

TLK 94 is a “single loop” digital microprocessor-based controller,

with ON/OFF, Neutral Zone ON/OFF, PID single action, PID dual
action (direct and reverse) control, PID for motorized actuators with

time positioning control. The instrument is equipped with

AUTO-TUNING

function (FAST or OSCILLATING type),

SELF-TUNING

function and automatic calculation of the

FUZZY

OVERSHOOT CONTROL

parameter for PID control. The PID

control has a particular algorithm with

TWO DEGREES OF

FREEDOM

that optimises the instrument’s features independently

of the event of process disturbances and Set Point variations.

Furthermore, the instrument allows for RS485 serial
communication using MODBUS-RTU communication protocol and
a transmission speed up to 38.400 baud.

The process value is

visualized on 4 red displays, the Set value is visualized on 4 green
displays while the outputs status is indicated by 6 leds. The

TECNOLOGIC spa - TLK 94

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instrument provides for the storage of 4 Set Points and can have
up to 6 outputs : relay type or can drive solid state relays type

(SSR), or it is also possible to have up to 2 analogue outputs.
The input is programmable and accepts temperature probes

(Thermocouples J,K,S,B,C,E,L,N,R,T; Thermo-resistances PT100,
Thermistors PTC and NTC; Infrared sensors mod. TECNOLOGIC

IRS) and normalized analogue signals (0/4..20 mA, 0/1..5 V,
0/2..10 V, 0..50/60 mV, 12..60 mV). The instrument have 2

programmable digital inputs for free voltage contacts and can be
equipped with an input for the current transformer, working as a

Heater Break Alarm function. Other important available functions
are: Loop-Break Alarm function, control power limitation, limitation

of the variation speed of the control power, split-range, reaching of
the Set Point at controlled speed, ramp and dwell function,
Soft-Start function, parameters protection on different levels.

1.2 - FRONT PANEL DESCRIPTION

TLK 94

Out2

SET

TUN

Out1

Out3 Out4 Out5

Out6

1 - Key P

: This is used to access the programming parameters

and to confirm selection.

2 - Key DOWN

: This is used to decrease the values to be set and

to select the parameters. If the key is held down, the user returns to
the previous programming level until he exits the programming

mode. Outside the programming mode it permits visualisation of
the current measured by the TAHB input, on the SV display.

3 - Key UP

: This is used to increase the values to be set and to

select the parameters. If the key is held down, the user returns to
the previous programming level until he exits the programming

mode. Outside the programming mode it permits visualisation of
the output control power, on the SV display.

4 - Key U

: This is a key with a function programmable by par.

“USrb”. It can be set to : Activate Auto-tuning and Self-tuning
functions, swap the instrument to manual control, silence the

alarm, change the active Set Point, deactivate control (see par.
4.17) and modify the visibility of the parameters in “ConF” menu

(see par. 2.3).

5 - Led OUT1

: indicates the state of output OUT1

6 - Led OUT2

: indicates the state of output OUT2

7 - Led OUT3

: indicates the state of output OUT3

8 - Led OUT4

: indicates the state of output OUT4

9 - Led OUT5

: indicates the state of output OUT5

10 - Led OUT6

: indicates the state of output OUT6

11 - Led SET

: it indicates access to the programming mode and

the parameters level (see par. 2.3).

12 - Led TUN

: indicates that the Self-tuning function is activated

(light on) or that Auto-tuning (flashing ) is in progress.

13 - Display PV:

normally indicates the process value

14 - Display SV:

normally indicates the active Set value, however it

can be programmed, using par. “diSP”, to visualize other values.

2 - PROGRAMMING

2.1 - FAST PROGRAMMING OF THE SET POINT

This procedure permits rapid programming of the active Set Point
and possibly the alarm thresholds (see par 2.3)
Push key “P”, then release it and the display will visualise

“SP n”

(where n is the number of the Set Point active at that moment) and
the programmed value.

To modify the value, press “UP” key to increase it or the “DOWN”
key to decrease it.

These keys change the value one digit at a time but if they are
pressed for more than one second, the value increases or

decreases rapidly and, after two seconds in the same condition,
the changing speed increases in order to allow the desired value to

be reached rapidly.
Once the desired value has been reached, by pushing key P it is

possible to exit by the fast programming mode or it is possible to
visualise the alarm thresholds

AL1, AL2, AL3, AL4

(see par. 2.3).

To exit the fast Set programming it is necessary to push key P,

after the visualisation of the last Set Point, or alternatively, if no key
is pressed for approx. 15 seconds, the display will return to normal
functioning automatically.

2.2 - SELECTION OF THE CONTROL STATE AND
PARAMETERS PROGRAMMING

By pushing key "P" and holding it down for approx. 2 sec. it is

possible to enter into the main selection menu.

S E L FT U N IN G

A U TO T U N IN G

2 sec.

H old fo r

"O FF "

"rE G "

"O P L O "

Using the "UP" or DOWN” keys, it is then possible to roll over the

selections:

to swap the regulator to the manual control state and
therefore to program the % control value using the

“UP” and “DOWN” keys

"OPLO"

to activate the Auto-tuning or Self-tuning function

"tunE"

to swap the regulator into the automatic control state

"rEG"

to swap the regulator into the OFF state

"OFF"

to enter into the configuration parameters menu

"ConF"

to enter into the operating parameters menu

"OPEr"

Once the desired item has been selected, push key “P” to confirm.

Selecting "OPEr" and "ConF" gives the possibility of accessing
other menus containing additional parameters and more precisely :

"OPEr" –

Operating parameters Menu: this normally contains the

Set Point parameters but it can contain all the desired parameters
(see par. 2.3).

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"ConF" –

Configuration parameters Menu: this contains all the

operating parameters and the functioning configuration parameters
(alarm configuration, control, input, etc.)
To enter the menu

“ConF”

select the option “ConF”, press the key

“P” and the display will show “0”.
At this request, enter, using keys “UP” and “DOWN”, the number

reported on the last page of this manual and push key “P”.
If an incorrect password is entered, the instrument exit from

programming mode.
If the password is correct, the display will visualise the code
identifying the first group of parameters (“

]

“) and with keys “UP”

and “DOWN” it will be possible to select the desired group of
parameters.

Once the desired group of parameters has been selected, the code
identifying the first parameter of the selected group will be

visualised by pushing the “P” key.
Again using the “UP” and “DOWN” keys, it is possible to select the

desired parameter and, if the key “P” is pressed, the display will
show the parameter’s code and its programming value, which can

be modified by using the “UP” or “DOWN” keys.
Once the desired value has been programmed, push key “P” once

more: the new value will be memorised and the display will show
only the code of the selected parameter.

By using the “UP” or “DOWN” keys, it is then possible to select a
new parameter (if present) and modify it as described above.

To select another group of parameters, keep the “UP” or “DOWN”
key pressed for approx. 2 sec., afterwards the display will return to

visualise the code of the group of parameters.
Release the key and by using the “UP” and “DOWN” keys, it will be

possible to select a new group.
To exit the programming mode, no key should be pressed for

approx. 20 seconds, or keep the “UP” or “DOWN” pressed until exit
from the programming mode is obtained.

The programming and exit modes for the “OPEr” menu are the
same as those described for menu “ConF” with the difference that

to access the menù "OPEr" the Password is not required.

Longer

Hold

2 sec.

Hold for

2 sec.

Hold for

ATTENTION:

The instrument is programmed in factory with all the

parameters, to exception of the Set Point "SP1" (and 2,3,4),
programmable in the menù "ConF" to the purpose to prevent wrong
accidental programming from non experienced consumers.

2.3 - PARAMETERS PROGRAMMING LEVELS

The menu “OPEr” normally contains the parameters used to

program the Set Point; however it is possible to make all desired
parameters appear or disappear on this level, by following this

procedure:
Enter the menu “ConF” and select the parameter to be made

programmable or not programmable in the menu “OPEr”.
Once the parameter has been selected, if the LED SET is switched

off, this means that the parameter is programmable only in the
menu “ConF”, if instead the LED is on, this means that the

parameter is also programmable in the menu “OPEr”.
To modify the visibility of the parameter, push key “U” : the LED

SET will change its state indicating the parameter accessibility level
(on = menu ”OPEr” and “ConF”; off = menu “ConF” only).

The active Set Point and the alarm thresholds will only be visible on
the Set Point fast programming level (described in par. 2.1) if the

relative parameters are programmed to be visible (i.e. if they are
present in the menu “OPEr”).

The possible modification of these Sets, with the procedure
described in par. 2.1, is instead subordinate to what is programmed
in par.

“Edit”

(contained in the group “

]

PAn

“).

This parameter can be programmed as :

=SE : The active Set Point can be modified while the alarm
thresholds cannot be modified.

=AE : The active Set Point cannot be modified while the alarm
thresholds can be modified

=SAE : Both the active Set Point and the alarm thresholds can be
modified

=SAnE : Both the active Set Point and the alarm thresholds cannot
be modified

2.4 - CONTROL STATE

The controller can act in 3 different ways : automatic control

(rEG),

control off

(OFF)

and manual control

(OPLO).

The instrument is able to pass from one state to the other :

- by selecting the desired state from the main selection menu suing
the keyboard.

- By using the key “U” on the keyboard; suitably programming par.
“USrb” (“USrb” = tunE; “USrb” = OPLO; “USrb” = OFF) it is possible

to pass from “rEG” state to the state programmed on the parameter
and vice versa.

- Automatically (the instrument swaps into "rEG" state at the and of
the auto-tuning execution)

When switched on, the instrument automatically reassumes the
state it was in when it was last switched off.

AUTOMATIC CONTROL (rEG)

– Automatic control is the normal

functioning state of the controller.
During automatic control, on the SV display, it is possible to

visualize the control power on the display by pushing key “UP”.
The range of the power values goes from H100 (100% of the

output power with reverse action) to C100 (100% of the output
power with direct action).

CONTROL OFF (OFF)

– The instrument can be swapped into the

“OFF” state, i.e. the control and the relative outputs are
deactivated.

The alarm outputs are instead working normally.

BUMPLESS MANUAL CONTROL (OPLO)

– By means of this

option it is possible to manually program the power percentage

given as output by the controller by deactivating automatic control.
When the instrument is swapped to manual control, the power

percentage, visualised on the SV display, is the same as the last
one supplied and can be modified using the “UP” and “DOWN”

keys.
In case of ON/OFF control, 0% corresponds to the deactivated

output while any value different from 0 corresponds to the activated
output.

As in the case of visualization, the programmable values range
from H100 (100% output power with reverse action) to C100 (100%

output power with direct action).
In case of motorized actuators with time positioning, the manual

control of the output is obtainable in the following way :
- By pushing the UP key, the opening of the actuator is driven

- By pushing DOWN key, the closing of the actuator is driven
For all time during which the manual control is active, “3 Pt” or

“OPEn” is visible on the lower display if the UP key is pressed or
“CLOS” if the DOWN key is pressed.

To return to automatic control, select "rEG" in the selection menu.

2.5 - ACTIVE SET POINT SELECTION

This instrument permits pre-programming of up to 4 different Set
points (

“SP1”

“SP2”

“SP3”

“SP4”

) and then selection of which

one must be active. The maximum number of Set points is
determined by the par.

"nSP"

located in the group of parameters “

]

“.

The active Set point can be selected :
- by parameter

"SPAt"

in the group of parameters “

]

“.

- by key “U” if par. "USrb" = CHSP

- by digital input if par. “diF” = CHSP or = SP1.2 or =HECo)
- Automatically between SP1 and SP2 if a time “dur.t” (see par.

4.12) has been programmed.
Set Points “SP1”, “SP2”, “SP3”, “SP4” will be visible depending on

the maximum number of Set Points selected on par. “nSP” and
they can be programmed with a value that is between the value
programmed on par.

“SPLL”

and the one programmed on par.

“SPHL”.

TECNOLOGIC spa - TLK 94

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Note

: in all the following examples the Set point is indicated as

"SP", however the instrument will act according to the Set point
selected as active.

3 - INFORMATION ON INSTALLATION AND USE

3.1 - PERMITTED USE

The instrument has been projected and
manufactured as a measuring and control device

to be used according to EN61010-1 for the
altitudes operation until 2000 ms.

The use of the instrument for applications not

expressly permitted by the above mentioned rule must adopt all the

necessary protective measures.
The instrument CANNOT be used in dangerous environments

(flammable or explosive) without adequate protection.
The installer must ensure that EMC rules are respected, also after

the instrument installation, if necessary using proper filters .
Whenever a failure or a malfunction of the device may cause

dangerous situations for persons, thing or animals, please
remember that the plant has to be equipped with additional devices

which will guarantee safety.

3.2 - MECHANICAL MOUNTING

The instrument, in DIN case 48 x 96 mm, is designed for flush-in
panel mounting.

Make a hole 45 x 92 mm and insert the instrument, fixing it with the
provided special brackets.

We recommend that the gasket is mounted in order to obtain the
front protection degree as declared. Avoid placing the instrument in

environments with very high humidity levels or dirt that may create
condensation or introduction of conductive substances into the

instrument.
Ensure adequate ventilation to the instrument and avoid installation

in containers that house devices which may overheat or which may
cause the instrument to function at a higher temperature than the

one permitted and declared.
Connect the instrument as far away as possible from sources of

electromagnetic disturbances such as motors, power relays, relays,
solenoid valves, etc.

The instrument can be removed from its housing from the front side
: it is recommended that the instrument be disconnected from the

power supply when it is necessary to carry out this operation.

3.3 - ELECTRICAL CONNECTION

Carry out the electrical wiring by connecting only one wire to each

terminal, according to the following diagram, checking that the
power supply is the same as that indicated on the instrument and

that the load current absorption is no higher than the maximum
electricity current permitted.

As the instrument is built-in equipment with permanent connection
inside housing, it is not equipped with either switches or internal

devices to protect against overload of current: the installation will
include an overload protection and a two-phase circuit-breaker,

placed as near as possible to the instrument, and located in a
position that can easily be reached by the user and marked as

instrument disconnecting device which interrupts the power supply
to the equipment.

It is also recommended that the supply of all the electrical circuits
connected to the instrument must be protect properly, using

devices (ex. fuses) proportionate to the circulating currents.
It is strongly recommended that cables with proper insulation,

according to the working voltages and temperatures, be used.
Furthermore, the input cable of the probe has to be kept separate

from line voltage wiring. If the input cable of the probe is screened,
it has to be connected to the ground with only one side.

We recommend that a check should be made that the parameters
are those desired and that the application functions correctly before

connecting the outputs to the actuators so as to avoid
malfunctioning that may cause irregularities in the plant that could

cause damage to people, things or animals.

3.4 - ELECTRICAL WIRING DIAGRAM

Out2,3,4,5: 4A-AC1(2A-AC3)/ 250 VAC

Out1: 6A-AC1(3A-AC3)/ 250 VAC

Pt100

GND

Out6

+12 VDC

0/1..5 V

0/2..10 V

0/4..20

(active)

(passive)

4..20

NTC

INPUT

PTC

TA HB

RS485

ANALOG.: 0/4..20mA - 0/2..10V

RELAYS:

OUTPUTS

SSR: 12 VDC/20 mA

6b
5b

4a
3a

DIG. IN 2

DIG. IN 1

Out1

10b

SUPPLY

9b
8b

Out2

12b
11b

Out4

Out3

9a
8a

10a

Out5

12a
11a

TLK 94

4 - FUNCTIONS

4.1 - MEASURING AND VISUALIZATION

All the parameters referring measurements are contained in the
group

“

]

InP”.

By using par.

“HCFG”,

it is possible to select the input signal type

which may come: from a thermocouple (tc), a thermo-resistance or
a thermistor (rtd), from a transducer with normalised analogue

signal in current (I) or tension (UoLt) or also from a signal coming
from the communication serial line of the instrument (SEr).

Once the signal type has been selected, it is necessary to set the
type of input probe on par.

“SEnS”,

which can be :

- for thermocouples J (J), K (CrAL), S (S), B (b), C (C), E (E), L (L),

N (n), R (r), T (t) or for infrared sensors serie TECNOLOGIC IRS –
A range - with linearization J (Ir.J) or K (Ir.CA)

- for thermoresistances Pt100 IEC (Pt1) or thermistors PTC
KTY81-121 (Ptc) or NTC 103AT-2 (ntc)

- for normalised signals in current 0..20 mA (0.20) or 4..20 mA
(4.20)

- for normalised signals in tension 0..50 mV (0.50), 0..60 mV (0.60),
12..60 mV (12.60), 0..5 V (0.5), 1..5 V (1.5), 0..10 V (0.10) or 2..10

V (2.10).
We recommend that the instrument be switched on and off

whenever these parameters are modified, in order to obtain a
correct measurement.

For the instruments with input for temperature probes (tc, rtd) it is
possible to select the unit of measurement (°C, °F) through par.

“Unit”,

and the desired resolution (0=1°; 1=0,1°) through par.

“dP”

Instead, with regards to the instruments with normalised analogue
input signals, it is first necessary to program the desired resolution
on par.

“dP”

(0=1; 1=0,1; 2=0,01; 3=0,001) and then, on par.

"SSC"

, the value that the instrument must visualise at the

beginning of the scale (0/4 mA, 0/12 mV, 0/1 V o 0/2 V) and, on
par.

"FSC",

the value that the instrument must visualise at the end

of the scale (20 mA, 50 mV, 60 mV, 5 V or 10 V).

In the case of infrared sensors (TECNOLOGIC IRS-"A" range), by
programming the sensor as "Ir.J" or "Ir.CA", the par. "

rEFL

" is also

present and it allows the correction of possible measuring errors

caused by the environment lighting and by the reflectivity of the
material. This parameter should be programmed with a high value

if the material to be measured is particularly bright / reflective and
must be reduced if the surface is particularly dark / not reflective,

keeping in mind however that for most materials, the recommended
value is within 1.00 and 0.80.

The instrument allows for measuring calibration, which may be
used to recalibrate the instrument according to application needs,
by using par.

“OFSt”

and

“rot”.

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Programming par. “rot”=1,000, in par. “OFSt” it is possible to set a
positive or negative offset that is simply added to the value read by

the probe before visualisation, which remains constant for all the
measurements.

If instead, it is desired that the offset set should not be constant for
all the measurements, it is possible to operate the calibration on

any two points.
In this case, in order to decide which values to program on par.

“OFSt” and “rot”, the following formulae must be applied :

“rot” = (D2-D1) / (M2-M1) “OFSt” = D2 - (“rot” x M2)

where:

M1 =measured value 1
D1 = visualisation value when the instrument measures M1

M2 =measured value 2
D2 = visualisation value when the instrument measures M2

It then follows that the instrument will visualise :

DV = MV x “rot” + “OFSt”

where: DV = visualised value

MV= measured value

Example 1: It is desired that the instrument visualises the value
effectively measured at 20° but that, at 200°, it visualises a value

lower than 10° (190°).
Therefore : M1=20 ; D1=20 ; M2=200 ; D2=190

“rot” = (190 - 20) / (200 - 20) = 0,944
“OFSt” = 190 - (0,944 x 200) = 1,2
Example 2: It is desired that the instrument visualises 10° whilst the

value actually measured is 0°, but, at 500° it visualises a 50° higher
value (550°).

Therefore : M1=0 ; D1=10 ; M2=500 ; D2=550
“rot” = (550 - 10) / (500 - 0) = 1,08
“OFSt” = 550 - (1,08 x 500) = 10
By using par.

“FiL”

it is possible to

program time constant of the

software filter for the input value measured, in order to reduce
noise sensitivity (increasing the time of reading).

In case of measurement error, the instrument supplies the power
as programmed on par.

“OPE”.

This power will be calculated according to cycle time programmed

for the PID controller, while for the ON/OFF controllers the cycle
time is automatically considered to be equal to 20 sec. (e.g. In the

event of probe error with ON/OFF control and “OPE”=50, the
control output will be activated for 10 sec., then it will be

deactivated for 10 sec. and so on until the measurement error
remains.).
By using par.

“InE”

it is also possible to decide the conditions of

the input error, allowing the instrument to give the power
programmed on par. “OPE” as output.

The possibilities of par. “InE” are :
= Or : the condition occurs in case of over-range or probe breakage

= Ur : the condition occurs in case of under-range or probe
breakage

= OUr : the condition occurs in case of over-range or under-range
or probe breakage
Using par.

“diSP”,

located in the group

“

]

PAn”,

it is possible to set

normal visualization of the SV display which can be the active Set
Point (SP.F), the control power (Pou), the Set Point operating when
there are active ramps (SP.o) or alarm threshold AL1, 2, 3, 4 .

4.2 - OUTPUT CONFIGURATION

The instrument’s outputs can be programmed by entering the
group of parameters

“

]

Out”

where different parameters (depending

on the type of outputs - digital or analogue - available on the
instrument) are located.

Note:

In the following examples, the number of outputs is

generically indicated with

- DIGITAL OUTPUTS relay or SSR type :

The par.

“OnF”

can be set for the following functions :

= 1.rEG : Main control output
= 2.rEG : Secondary control output

= ALno : Alarm output normally open
= ALnc : Alarm output normally closed

= On : Output always activated
= OFF : Output deactivated

The coupling outputs number outputs – number alarms can be
made in the group referring to the alarm to the alarm (“

]

AL1, 2, 3,

4”). The option "On" it results usable for the output OUT6 (standard
on all the models) to have an auxiliary supply output for input

sensors

- ANALOGICAL OUTPUTS 0/4..20 mA or 0/2..10 V (only
OUT1,2):

With the parameter

“Aorn”

it is possible to set the beginning of the

scale used for the output.

This parameter will therefore be set at:
= 0 : if one intends to use the beginning of the scale as equal to 0

(0 mA if the output is 0/4...20 mA, or 0 V if the output is 0/2...10 V)
= no_0 : if one intends to use the beginning of the scale other than

0 (4 mA if the output is 0/4...20 mA, or 2 V if the output is 0/2...10
V)
The parameter

“AonF”

will be present by which it is possible to

configure the function of the analogical output as:

= 1.rEG : Primary control output
= 2.rEG : Secondary control output

= r.inP : measurement retransmission output
= r.Err : error retransmission output [SP-PV]

= r.SP : Active Set Point retransmission output
= r.SEr : output led by serial communication line of the instrument

= OFF : deactivated output
In the case that analogical output is configured as 1.rEG or 2.rEG

the output signal will be proportional to the control power
calculated by the instrument starting from 0% (output signal

corresponding to the set beginning of the scale) up to 100% (output
signal corresponds to the maximum that can be supplied by the

type of output available).
The analogical control outputs can only be used for PID single

action or dual action controls.
If the set control mode was the ON/OFF type, the analogical output

could only take on the control states 0 % or 100 %.
In the case that the analogical output function should be configured

for the retransmission of the signal, it is therefore necessary to
programme another two parameters which set the minimum and

maximum reference values.
Therefore, in these cases, set the parameter

"AonL"

with the value

that the instrument must provide the minimum value (0/4 mA or 0/2

V) in output and the value to which the instrument must provide the
maximum value (20 mA o 10 V) to the parameter

"AonH"

in output.

4.3 - ON/OFF CONTROL (1.rEG)

All the parameters referring to the ON/OFF control are contained in
the group

“

]

rEG”.

This type of control can be obtained by programming par.

"Cont"

On.FS or = On.FA and works on the output programmed as

1.rEG,

depending on the measure, on the active Set Point

“SP”

, on the

functioning mode

"Func”

and on the hysteresis

"HSEt

The instrument carries out an ON/OFF control with symmetric

hysteresis if “Cont" = On.FS or with asymmetrical hysteresis if
“Cont” = On.FA.

O UT

S P

o ff

O N

H EAt - O n.F A

O UT

tim e

H S Et

S P

P V

H SE t

tim e

C ooL - O n.F A

O N

off

o ff

C ooL - O n.FS

H EAt - O n.F S

O N

O UT

S P

o ff

off

O N

H S Et

tim e

O UT

O N

S P

P V

O N

off

o ff

O N

tim e

H SE t

H S Et

H SE t

1.rE G

1.rEG

1.rE G

The control works in the following way : in the case of reverse
action, or heating (“FunC”=HEAt), it deactivates the output, when

the process value reaches [SP + HSEt] in case of symmetrical
hysteresis, or [SP] in case of asymmetrical hysteresis and is then

activated again when the process value goes below value [SP -
HSEt]. Vice versa, in case of direct action or cooling

("Func”=CooL), it deactivates the output, when the process value

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 5

reaches [SP - HSEt] in case of symmetrical hysteresis, or [SP] in
case of asymmetrical hysteresis and is activated again when the

process value goes above value [SP + HSEt].

4.4 - NEUTRAL ZONE ON/OFF CONTROL (1.rEG - 2.rEG)

All the parameters referring to Neutral Zone ON/OFF control are
contained in the group

“

]

rEG”.

This type of control can be obtained when 2 outputs are
programmed respectively as 1.rEG and 2.rEG and the par.

“Cont”

= nr .

The Neutral Zone control is used to control plants in which there is
an element which causes a positive increase (ex. Heater,

humidifier, etc.) and an element which causes a negative increase
(ex. Cooler, de-humidifier, etc).

The control functions works on the programmed outputs depending
on the measurement, on the active Set Point

“SP”

and on the

hysteresis

"HSEt

The control works in the following way : it deactivates the outputs

when the process value reaches the Set Point and it activates the
output 1rEG when the process value goes below value [SP - HSEt],

or it activates the output 2.rEG when the process value goes above
[SP + HSEt].

Consequently, the element causing a positive increase has to be
connected to the output programmed as 1.rEG while the element

causing a negative increase has to be connected to the output
programmed as 2.rEG.

OUT 2.rEG

(cooling)

OUT 1.rEG

(heating)

off

time

HSEt

4.5 -SINGLE ACTION PID CONTROL (1.rEG)

All the parameters referring to PID control are contained in the
group

“

]

rEG”.

The Single Action PID control can be obtained by programming
par.

"Cont"

= Pid and works on the output 1.rEG depending on the

active Set Point

“SP”

, on the functioning mode

"Func”

and on the

instrument’s PID algorithm with two degree of freedom.

0 N

0 %

( H E A t )

1 . r E G

A N A L O G .

1 0 0 %

t c r 1

1 . r E G

( H E A t )

D I G .

S P

P V

t c r 1

o f f

tc r1

tc r 1

0 N

o f f

o ff

0 N

o f f

o ff

0 N

tc r1

o f f

0 N

tim e

In order to obtain good stability of the process variable, in the event

of fast processes and with control by digital output, the cycle time
“tcr1” has to have a low value with a very frequent intervention of

the control output.
In this case use of a solid state relay (SSR) is recommended for

driving the actuator.
The Single Action PID control algorithm foresees the setting of the

following parameters :

"Pb"

- Proportional Band

"tcr1"

- Cycle time of the output 1rEG (digital output only)

"Int"

- Integral Time

"rS"

- Manual Reset (if “Int =0 only)

"dEr"

- Derivative Time

“FuOC” -

Fuzzy Overshoot Control

This last parameter allows the variable overshoots at the start up of
the process or at the changing of the Set Point to be avoided.

Please remember that a low value on this parameter reduces the
overshoot while a high value increase it.

2
1

S P

P V

t im e

1: “FuOC” OK
2: “FuOC” too high
3: “FuOC” too low

4.6 - DOUBLE ACTION PID CONTROLLER (1.rEG - 2.rEG)

All the parameters referred to PID control are contained into the
group

“

]

rEG”.

The Double Action PID control is used to control plants where there

is an element which causes a positive increment (ex. Heating) and
an element which causes a negative increment (ex. Cooling).

This type of control is obtainable when 2 outputs are programmed
respectively as 1.rEG and 2.rEG and the par.

“Cont”

= Pid.

The element causing a positive increase has to be connected to

the output programmed as 1.rEG while the element causing a
negative increase has to be connected to the output programmed

as 2.rEG.
The Double Action PID control works on the outputs 1.rEG and
2.rEG depending on the active Set Point

“SP”

and on the

instrument’s PID algorithm with two degree of freedom.
In order to obtain a good stability of the process variable, in case of

fast processes and with control by digital outputs, the cycle times
“tcr1” and “tcr2” have to have a low value with a very frequent

intervention of the control outputs.
In this case it’s recommended to use solid state relays (SSR) to

drive the actuators.
The Double Action PID control algorithm needs the programming of

the following parameters :

"Pb"

- Proportional Band

"tcr1"

- Cycle time of the output 1rEG

“tcr 2”

- Cycle time of the output 2rEG

"Int"

- Integral Time

"rS"

- Manual Reset (if “Int =0 only)

"dEr"

- Derivative Time

“FuOC” -

Fuzzy Overshoot Control

"Prat"

- Power Ratio or relation between power of the element

controlled by output 2.rEG and power of the element controlled by

output 1.rEG.

.7 - PID CONTROL FOR MOTORIZED ACTUATORS WITH TIME

POSITIONING (1.rEG - 2.rEG)

All the parameters concerning the PID control for motorised
actuators are contained in the group

“

]

rEG”.

This type of control is used to control installations that have a

motorised actuator with digital opening and closing controls that
remain at the point they have reached if no command is received

and which are started up when 2 outputs are configured as 1.rEG
and 2.rEG respectively and the parameter

“Cont”

= 3 Pt is set.

The opening command for actuation will be supplied by the output

configured as 1.rEG while the closing command will be supplied by
the output configured as 2.rEG.

The PID type control for motorised actuators therefore acts on the
outputs 1.rEG and 2.rEG depending on the active Set point

“SP”

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 6

and the result of the PID control algorithm with two degrees of
liberty for the instrument.

The control system used does not foresee a retroaction for finding
the current position of the actuator.

If the actuator is not fitted with safety stop contacts that interrupt
the actuator at the end of its run it is necessary to equip the

installation with these contacts (SQo, SQc) as shown in the
diagram

S u p p l y

C L O S E

O P E N

S Q o

1 . r E G

2 . r E G

S Q c

T L K 9 4

The PID control algorithm for motorised actuators with time

positioning foresees the setting of the following parameters:

“Pb”

- Proportional band

“Int”

- Integral time

“rS”

- manual reset (only if “Int =0)

“dEr”

- Derivative time

“FuOC” -

Fuzzy Overshoot Control

“tcor”

- time of actuator run.

This is the time, expressed in seconds that is needed for the

actuator to pass from the “completely open” position to “completely
closed” position.

“SHrI”

- Minimum control value.

It is the value that the control must have reached (in %) before it
has an effect on the output. It is needed to prevent the control from

intervening too frequently.

“PoSI”

- Switch on position.

This is the position that the actuator must reach when the

instrument is switched on. It can have the following values :
nO = the actuator remains where it is,

oPEn = the actuator goes to the “completely open” position,
cLoS = the actuator goes to the “completely closed” position.

If the options "OPEn" or "CloS" are programmed, when it is turned
on the device with activate the output 1.rEG (if "oPEn") or 2.rEG (if

"cLoS") for the time set on parameter "tcor" after which control
begins.

In the event of an error in measurement, the outputs are activated
so that the valve moves to the position fixed by the parameter

“PoSI”.

4.8 - AUTOTUNING

AND SELFTUNING FUNCTIONS

All the parameters referring to the AUTO-TUNING and
SELF-TUNING functions are contained in the group

“

]

rEG”.

The AUTO-TUNING and SELF-TUNING functions permit the

automatic tuning of the PID controller.
The

AUTO-TUNING

function (

FAST

OSCILLATING

type)

permits the calculation of the PID parameters by means of a tuning

cycle and, at the end of this operation, the parameters are stored
into the instrument’s memory and remain constant during control.
The

SELF-TUNING

function (rule based "TUNE-IN") instead allows

control monitoring and the continuous calculation of the parameters
during control.

All functions automatically calculate the following parameters :

"Pb"

- Proportional Band

"tcr1"

- Cycle time of the output 1.rEG

"Int"

- Integral Time

"dEr"

- Derivative Time

“FuOC” -

Fuzzy Overshoot Control

and, for the Double Action PID control, also :

“tcr 2”

- Cycle time of the output 2.rEG

"Prat"

- Ratio P 2.rEG/ P 1.rEG

To activate the AUTO-TUNING function proceed as follows :

1) Program and activate the desired Set Point.
2) Program par. "Cont" =Pid or =3 Pt if the instrument drives a

motorized actuator with time positioning.
3) Program par. "Func" according to the process to be controlled

through output 1.rEG.
4) Program an output as 2.rEG if the instrument controls a plant

with double action or a motorized actuator with time positioning.
5) Set the parameter

"Auto"

as:

= 1

- if FAST autotuning is desired automatically, each time the

instrument is switched on, on the condition that the process value

is lower (with “Func” =HEAt) than [SP- |SP/2|] or higher (with
“Func” =CooL) than [SP+ |SP/2|].

= 2

- if FAST autotuning is desired automatically, the next time the

instrument is switched on, on the condition that the process value
is lower (with “Func” =HEAt) than [SP- |SP/2|] or higher (with

“Func” =CooL) than [SP+ |SP/2|], and once the tuning is finished,
the par. “Auto” is automatically swapped to the OFF state

= 3

- if manual FAST autotuning is desired, by selecting par. “tunE”

in the main menu or by key “U” correctly programming as “USrb” =
tunE. The Autotuning will start at the condition that the process

value is lower (with “Func” =HEAt) than [SP- |SP/5|] or higher (with
“Func” =CooL) than [SP+ |SP/5|].

= 4

- if it’s desired to activate the FAST autotuning automatically at

the end of programmed Soft-Start cycle or each time the Set Point
is changed. The Autotuning will start at the condition that the

process value is lower (with “Func” =HEAt) than [SP- |SP/5|] or
higher (with “Func” =CooL) than [SP+ |SP/5|].

= - 1

- if the OSCILLATING autotuning is to be started automatically

each time the instrument is turned on.

= - 2

- if the OSCILLATING autotuning is to be started

automatically when the instrument is turned on the next time and,

once tuning has been completed, the parameter “Auto"=OFF is set
automatically.

= - 3

- if OSCILLATING autotuning is started up manually, by

selecting par. “tunE” in the main menu or by key “U” correctly
programming as “USrb” = tunE.

= - 4

- if OSCILLATING autotuning is to be started automatically

each time the Set Point is changed.

Note : the Autotuning Fast type is particularly rapid and has no
effect on the control as it calculates the parameters during the Set
Point reaching phase.
In order to correctly perform the Autotuning Fast type it’s necessary
that at the start of the cycle there is a certain difference between
the process and the Set Point and for this reason the instrument
activates the Autotuning Fast type only when :
- For “Auto” = 1 or 2: the process value is lower (with “Func”
=HEAt) than [SP- |SP/2|] or higher (with “Func” =CooL) than [SP+
|SP/2|].
- For “Auto” = 3 or 4 : the process value is lower (with “Func”
=HEAt) than [SP- |SP/5|] or higher (with “Func” =CooL) than [SP+
|SP/5|].
The Autotuning Fast type is not advisable when the Set Point is
next to the initial reading or when the measured variable changes
irregularly during the tuning cycle (for reasons due to the process
the variable goes up or down).
In this cases we advice the Autotuning oscillatory type that
activates some ON-OFF control cycles permitting the oscillation of
the process value around the Se Point value and afterward the
control swap to the PID type with those values calculated by the
Autotuning.

6) Exit from the parameter programming.

7) Connect the instrument to the controlled plant.
8) Start up autotuning turning off and on the instrument if “Auto" = 1

or 2, by selecting “tunE” in the main menu (or by correctly
programming key “U” ) if “Auto" = 3, or by varying the Set value if

“Auto" = 4.
At this point, the Autotuning function is started up and is marked by

the turning on of the led TUN.
The regulator starts up a series of operations on the connected

system in order to calculate the most suitable PID regulation
parameters.

If, at the FAST Auto-tuning start, the condition for the lower or
higher process value is not found the display will show

“ErAt”

and

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 7

the instrument will be swapped to normal control conditions
according to the previously programmed parameters.

To make the error “ErAt” disappear, press key P.
The autotuning cycle is limited to a maximum of 12 hours.

If the process has not ended in 12 hours the instrument will show

"noAt"

Instead, if a probe error should occur, the instrument will interrupt

the cycle being carried out.
The values calculated by Autotuning will be memorized

automatically by the instrument at the end of the correct completion
of the autotuning cycle in the parameters related to PID regulation.

Note :

The instrument is already programmed in our factory to

carry out auto-tuning at every instrument switch on ("Auto" = 1).

To activate the SELF-TUNING function proceed as follows

1) Program and activate the desired Set Point.
2) Program par. "Cont" =Pid.

3) Program par. "Func" according to the process to be controlled
through output 1.rEG.

4) Program an output as 2.rEG if the instrument controls a
dual-action plant
5) Program par.

"SELF"

= yES

6) Exit from the parameter programming.
7) Connect the instrument to the controlled plant.
8) Activate Self-tuning selecting par.

“tunE”

in the main menu (or

by correctly programming key “U”).
When the Self-tuning function is active, the led TUN is permanently

lit up and all the PID parameters ("Pb", "Int", "dEr", etc.) are no
longer visualized.

To stop the Auto-tuning cycle or deactivate the Self-tuning function

select one of the control types : "rEG", "OPLO" or "OFF" from the
menu “SEL”. If the instrument is switched off during Auto-tuning or

with the Self-tuning function activated, these functions will remain
activated the next time it is switched on.

4.9 - CONTROL POWER LIMITATION

Using this function, it is possible to limit the output control power

(separately for both control outputs) within a minimum limit and a
maximum limit .

It is only possible to use these limits if the PID control is single or
dual action and it may be useful to overcome some mechanical

problems of the actuators such as valves that do not open until the
output has reached at least 20% and/or are already completely

closed when the power has reached 80%.
The PID control of the instrument normally works producing power

between 0 and 100 % in the case of single-action PID and –100
(C) and 100 (H) % in the case of dual-action PID.

The function is therefore deactivated by setting “ro1.L” =0 “ro2.L” =
0 and “ro1.H” =100, “ro2.H” = 100.

By setting different values the power is lowered to within the limits
set in order to use the actuator’s dynamics to the maximum.

The parameters that can be set for this function, contained in the

“

]

rEG”

block are:

“ro1.L”

- minimum power in output from 1.rEG (H)

“ro1.H”

- maximum power in output from 1.rEG (H)

“ro2.L”

- minimum power in output from 2.rEG (C)

“ro2.H”

- maximum power in output from 2.rEG (C)

The limitation is not active under the “OPLO” manual control mode.

4.10 - LIMITATION OF THE CONTROL POWER VARIATION
SPEED

This function makes it possible to limit the variation speed of the

control power in output (separately for both control outputs).
It is only possible to use this function if the PID control is single or

dual action and can be useful for overcoming some problems with
the actuators that may need a slow progressive variation in power.

The parameters that can be set for this function, contained in the
block

“

]

rEG”,

are:

“OPS1”

- variation speed of the output power from 1.rEG (H)

expressed in [% / sec].

“OPS2”

- variation speed of the output power from 2.rEG (C)

expressed in [% / sec].

The limitation function is deactivated by setting the parameters =
InF and if “OPLO” is not active in manual control mode.

4.11 - SPLIT RANGE FUNCTION

The use of this function is only possible if the PID control is dual

function and can be used to delay or bring forward the intervention
of the actuators commanded by the instrument.

Using this function it is therefore possible to optimise the
intervention of the two actuators in such a way that their actions do

not overlap or so that they overlap so that they obtain the mix of the
two actions of the actuators.

Basically, this means setting two power offsets (one for direct
action and one for reverse action) that set the beginning of the

intervention of the actuator commanded by the output.
The parameters that can be set for this function contained in the
block

“

]

rEG”,

are:

“thr1”

: Power threshold at which output 1.rEG begins to operate.

“thr2”

: Power threshold at which output 2.rEG begins to operate.

Basically, if one wishes to bring forward the reverse action (1.rEG)
and delay the direct action (2.rEG) it is necessary to set positive

values on parameter “thr1” and negative values on parameter
“thr2”.

In this way, the area within which the two outputs are not activated
at the same time is increased.

Pb
Pb

time

-100%

thr2

thr1

100%

1rEG

(Cooling)

2rEG

(Heating)

Vice versa if one wishes to extend the reverse action (1.rEG) and

bring forward the direct action (2.rEG) it is necessary to set nega-
tive values on parameter “thr1” and positive values on parameter

“thr2”.
In this way, the area within which the two outputs are activated at

the same time is increased.

time

thr1

thr2

100%

-100%

2rEG

(Cooling)

1rEG

(Heating)

The split range function is deactivated by setting the respective
parameters =0.

time

100%

-100%

(Heating)

(Cooling)

2rEG

1rEG

Note

: In order to simplify the explanation of the example graphs a

dual action control that is only proportional (and therefore with “dEr”
and “Int” = OFF) with “Prat” = 1.0 and “rS” = 0.0 was considered.

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 8

4.12 - REACHING OF THE SET POINT AT CONTROLLED
SPEED AND AUTOMATIC SWITCHING BETWEEN TWO SET
POINTS (RAMPS AND DWELL TIME)

All the parameters referring to the ramps functioning are contained
in the group

“

]

rEG”.

It is possible to reach the set point in a predetermined time (in any

case longer than the time the plant would naturally need). This
could be useful in those processes (heating or chemical

treatments, etc.) where the set point has to be reached gradually,
in a predetermined time.

Once the instrument has reached the first Set Point (SP1) it is pos-
sible to have automatic switching to the second Set Point (SP2) af-

ter a set time, thus obtaining a simple automatic process cycle.
These functions are available for all the programmable controls

(PID single and double action, ON/OFF and Neutral Zone
ON/OFF).

The function is determined by the following parameters :

"SLor"

- Gradient of first ramp expressed in unit/minute

"SLoF"

- Gradient of second ramp expressed in unit/minute.

"dur.t"

- Dwell time of Set Point “SP1” before automatic switching

to Set Point “SP2” (expressed in hrs. and min.).

The functions are deactivated when the relative parameters are =
InF.

If is desired only one ramp (ex. to reach “SP1”) it is enough to
program on the par. "SLor" the desired value.

The ramp "SLor" it will always active at power on and when the
Active Set Point value is changed.

S P 1

[U n it]

S V

S P 1 V a lu e

c h a n g e

S P 1

tim e [m in .]

S L o r

If it is desired an automatic cycle from the power on instead it is

necessary to program the par. "nSP" = 2, to program the two Set
Point values "SP1" and "SP2" and naturally to program the par.

"SLor", "dur.t" and "SLoF" with the desired values.
In this case at the end of the cycle all the ramps won't be more

active.

[ U n i t ]

S P 1

S V

A U T O

c h a n g e

S e t

d u r . t

S P 2

t i m e [ m i n . ]

S L o r

S L o F

Examples with starts from values lower than SP and with
decreasing of SP.

Note:

In case of PID control, if Auto-tuning is desired whilst the

ramp function is active, this will not be carried out until the tuning
cycle has been completed. It is therefore recommended that
Auto-tuning be started avoiding activating the ramp function and,
once the tuning is finished, deactivate Auto-tuning (“Auto” = OFF),
program the desired ramp and, if it automatic tuning is desired,
enable the Self-tuning function.

4.13 - SOFT-START FUNCTION

All the parameters referring to the Soft -Start functioning are
contained in the group

“

]

rEG”.

The Soft-Start function only works through PID control and allows

the limitation of control power when the instrument is switched on,
for a programmable period of time.

This is useful when the actuator, driven by the instrument, may be
damaged excess power supplied when the application is not yet in

the normal rating. (ex. for certain heating elements).
The function depends on the following parameters :

“St.P”

- Soft-Start power

“SSt”

- Soft-Start time (expressed in hh.mm)

“HSEt”

- End Soft Start cycle threshold

If both parameters are programmed with values other than OFF,
when switched on the instrument gives an output power as

programmed on par. “St.P” for the time programmed on par. “SSt”
or when is reached the absolute value programmed at par. “HSEt”.

Practically, the instrument works in manual condition and switches
to automatic control at the elapsing of time “SSt” or when is

reached the absolute value programmed at par. “HSEt”.
To disable the Soft-Start function simply program par. “SSt” = OFF.

Whenever, a measurement errors occurs during the Soft-Start
execution, the function is interrupted and the instrument gives an

output power as programmed on par. “OPE”.
If the measurement is restored, the Soft-Start is still deactivated.

If it’s desired to activate the Autotuning with Soft-Start set par.
“Auto”=4 / -4

The Autotuning will start automatically at the end of programmed
Soft-Start cycle (see. par. 4.8).

4.14 - ALARMS OUTPUTS FUNCTIONS (AL1, AL2, AL3, AL4)

The alarms depend on the process value (AL1, AL2, AL3, AL4) and

before setting them to work, it is necessary to know which output
the alarm has to correspond to.

First of all it is necessary to configure in the groups of parameters

“

]

Out ”,

the parameters relative to the outputs required as alarm

(“O1F”, “O2F”, “O3F”, “O4F”, “O5F”, “O6F”) programming the

parameter relating to the desired output as follows :

= ALno

if the alarm output has to be ON when the alarm is active,

while it is OFF when the alarm is not active

= ALnc

if the alarm output has to be ON when the alarm is not

active, while it is OFF when the alarm is active

Note:

In all the examples that follow is made reference to the alarm

AL1. Naturally the operation of the other alarms results analogous.

Have now access at the group

“

]

AL1”,

and program on par.

“OAL1”

, to which output the alarm signal has to be sent.

The alarm functioning is instead defined by parameters :

"AL1t "

- ALARM TYPE

"Ab1"

- ALARM CONFIGURATION

“AL1”

- ALARM THRESHOLD

“AL1L”

- LOW ALARM THRESHOLD (for band alarm) OR

MINIMUM SET OF AL1 ALARM THRESHOLD (for low or high

alarm)

“AL1H”

- HIGH ALARM THRESHOLD (for band alarm) OR

MAXIMUM SET OF AL1 ALARM THRESHOLD (for low or high

alarm)

“HAL1” -

ALARM HYSTERESIS

“AL1d”

- ALARM ACTIVATION DELAY (in sec.)

"AL1i"

- ALARM BEHAVIOUR IN THE EVENT OF

MEASUREMENT ERROR

"AL1t" - ALARM TYPE :

the alarm output can behave in six

different ways.

LoAb

= ABSOLUTE LOW ALARM: The alarm is activated when

the process value goes below the alarm threshold set on parameter
"AL1” and will be deactivated when it goes above the value

[AL1+HAL1].
With this mode is possible to program the minimum and the

maximum set of “AL1” by “AL1L” and “AL1H” parameters.

HiAb

= ABSOLUTE HIGH ALARM: The alarm is activated when the

process value goes higher than the alarm threshold set on

parameter "AL1" and will be deactivated when it goes below the
value [AL1 - HAL1].

With this mode is possible to program the minimum and the
maximum set of “AL1” by “AL1L” and “AL1H” parameters.

LoAb

off

AL1

HiAb

HAL1

time

off

AL1

time

HAL1

off

OUT

off

OUT

AL1

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 9

LodE

= DEVIATION LOW ALARM: The alarm is activated when

the process value goes below the value [SP1 + AL1] and will be
deactivated when it goes above the value [SP1 + AL1 + HAL1].

With this mode is possible to program the minimum and the
maximum set of “AL1” by “AL1L” and “AL1H” parameters.

HidE

= DEVIATION HIGH ALARM: The alarm is activated when the

process value goes above the value [SP1 + AL1] and will be
deactivated when it goes below the value [SP1 + AL1 - HAL1].

With this mode is possible to program the minimum and the
maximum set of “AL1” by “AL1L” and “AL1H” parameters.

LodE

off

-AL1

HAL1

time

off

AL1

HidE

time

HAL1

off

OUT

AL1

OUT

AL1

LHAb

= ABSOLUTE BAND ALARM: The alarm is activated when

the process value goes under the alarm threshold set on parameter

"AL1L" or goes higher than the alarm threshold set on parameter
"AL1H" and will be deactivated when it goes below the value [AL1H

- HAL1] or when it goes above the value [AL1L + HAL1].

LHdE

= DEVIATION BAND ALARM: The alarm is activated when

the process value goes below the value [SP1 + AL1L] or goes

above than the value [SP1 + AL1H] and will be deactivated when it
goes below the value [SP1 + AL1H - HAL1] or when it goes above

the value [SP1 + AL1L + HAL1].

LHAb

off

AL1H

AL1L

time

off

HAL1

AL1L

AL1H

time

LHdE

HAL1

off

OUT

AL1

OUT

AL1

Ab1" - ALARM CONFIGURATION:

This parameter can assume a

value between 0 and 31.
The number to be set, which will correspond to the function

desired, is obtained by adding the values reported in the following
descriptions :

ALARM BEHAVIOUR AT SWITCH ON: the alarm output may
behave in two different ways, depending on the value added to par.

“Ab1”.
+0 = NORMAL BEHAVIOUR: The alarm is always activated when

there are alarm conditions.
+1 = ALARM NOT ACTIVATED AT SWITCH ON: If, when switched

on, the instrument is in alarm condition, the alarm is not activated.
It will be activated only when the process value is in non-alarm

conditions and then back in alarm conditions.

P V

+ 1

+ 0

t i m e

A L 1

O N

o f f

A b 1

exemple with absolute low alarm

ALARM DELAY: the alarm output may behave in two different
ways depending on the value added to par. “Ab1”.

+0 = ALARM NOT DELAYED: The alarm is immediately activated
when the alarm condition occurs.

+2 = ALARM DELAYED: When the alarm condition occurs, delay
counting begins, as programmed on par. “AL1d” (expressed in

sec.) and the alarm will be activated only after the elapsing of that
time.

ALARM LATCH: : the alarm output may behave in two different
ways depending on the value added to par. “Ab1”.

+ 0 = ALARM NOT LATCHED: The alarm remains active in alarm
conditions only.

+ 4 = ALARM LATCHED: The alarm is active in alarm conditions
and remains active even when these conditions no longer exist,

until the correctly programmed key “U”, (“USrb”=Aac) has been
pushed.

A L 1

P V

O N

t i m e

+ 0

A b 1

+ 4

o f f

exemple with absolute high alarm

ALARM AKNOWLEDGEMENT: : the alarm output may behave in

two different ways depending on the value added to par. “Ab1”.
+ 0 = ALARM NOT AKNOWLEDGED: The alarm always remains

active in alarm conditions.
+ 8 = ALARM AKNOWLEDGED: The alarm is active in alarm

conditions and can be deactivated by key “U” if properly
programmed (“USrb”=ASi), and also if alarm conditions still exist.

ALARM BEHAVIOUR AT SET POINT CHANGE (DEVIATION
ALARMS ONLY): the alarm output may behave in two different

ways, depending on the value added to par. “Ab1”.
+0 = NORMAL BEHAVIOUR: The alarm is always activated when

there are alarm conditions.
+16 = ALARM NOT ACTIVATED AT SET POINT CHANGE: If,

when Set Point change, the instrument is in alarm condition, the
alarm is not activated. It will be activated only when the process

value is in non-alarm conditions and then back in alarm conditions.

"AL1i" - ALARM ACTIVATION IN CASE OF MEASUREMENT
ERROR:

This allows one to establish how the alarm have behave

in the event of a measurement error (yES=alarm active; no=alarm

deactivated).

4.15 - HEATER BREAK ALARM FUNCTION (HB)

All the parameters referring to the Heater Break alarm function are
contained in the group

“

]

Hb”.

The Heater Break alarm function (Breakage of the heating element)
is only available when the instrument is equipped with the input

(TAHB) to measure the current and if use a digital output to control
the load.

This input accepts signals coming from current transformers (TA)
with max. output 50 mA.

The first operation to be carried out in order to obtain a correct
current measurement, is to set the current that the instrument has

to measure at the end of scale of the input TA (50 mA) on par.

“IFS”

T L K 9 4

T A

E H

K M

L o a d

P o w e r

S u p p l y

A C

5 b 6 b

o u t 1 . r E G

It is necessary to establish to which output the alarm has to
correspond.

To do this it is necessary to set the parameter relative to the output
to be used (“O1F”, “O2F”, “O3F”, “O4F”, “O5F”, “O6F”) in the
groups

“

]

Out”,

programming the parameter as :

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 10

= ALno

if the alarm output has to be active when the alarm is

active while it is deactivated when the alarm is not active.

= ALnc

if the alarm output has to be active when the alarm is not

active while it is deactivated when the alarm is active.
Enter group

“

]

Hb”

and program which output the alarm signal has

to address on parameter

“OHb

The functioning mode of the alarm is instead defined on par.

“HbF”

which can be set in the following way :

= 1

: The alarm is active when, with output 1rEG active, the current

measured by the input TAHB is lower than the value programmed
on par.

"IHbL"

= 2

: The alarm is active when, with output 1rEG not active, the cur-

rent measured by the input TAHB is higher than the value pro-
grammed on par.

"IHbH"

= 3

: The alarm is active when, with output 1rEG active, the current

measured by the input TAHB is lower than the value programmed
on par.

"IHbL"

or with output 1rEG not active, the current meas-

ured by the input TAHB is higher than the value programmed on
par.

"IHbH"

= 4

: The alarm is active when the current measured by the input

TAHB is lower than the value programmed on par.

"IHbL"

or the

measured current is higher than the value programmed on par.

"IHbH"

, independently by the state of the output 1.rEG.

On par. “IHbL” the value of the current normally absorbed by the
load when output 1.rEG is active has to be set, while on par. “IHbH”

the current normally absorbed by the load when output 1.rEG is not
active.

The programming of these parameters has to be carried out while
also considering the fluctuations of the net voltage to avoid

undesired alarms.
With regards to the hysteresis of the HB alarm, this is automatically

calculated by the instrument as 1% of the programmed thresholds.
During functioning it is possible to visualize the current measured

by the input TAHB when output 1rEG is activated, by pushing the
“DOWN” key and the current measured when output 1.rEG is deac-

tivated, by pushing the “DOWN” and “U” keys at the same time.
To exclude the Heater Break alarm it is enough to set “OHb” =
OFF.

Note :

The HB current measurement is valid if the output 1rEG is

activated (or deactivated) for 264 ms. at least.
This means that, if the cycle time (“tcr1”) is = 1 sec, the HB alarm is
able to intervene only when the output power is higher than 26,4%.

4.16 - LOOP BREAK ALARM FUNCTION

All the parameters referring to the Loop Break alarm function are
contained in the group

“

]

LbA”.

The Loop Break alarm is available on all the instruments, which
intervenes when, for any reason (short-circuit of a thermocouple,

thermocouple inversion, load interruption), the loop control is
interrupted.

First of all, it is necessary to establish to which output the alarm
has to correspond.

To do this it is necessary to set the parameter relative to the output
to be used (“O1F”, “O2F”, “O3F”, “O4F”, “O5F”, “O6F”) in the
groups

“

]

Out ”,

programming the parameter as :

= ALno

if the alarm output has to be ON when the alarm is active

while it is OFF when the alarm is not active.

= ALnc

if the alarm output has to be ON when the alarm is not

active while it is OFF when the alarm is active.
Enter group

“

]

LbA”

and program which output the alarm signal

has to be addressed to on par.

“OLbA”

The Loop Break alarm is activated if the output power remains at
the 100% of the value for the time programmed on par.

"LbAt"

(expressed in sec.).

To avoid false alarms, the value of this parameter has to be set
considering the time the plant takes to reach the Set point when

the measured value is a long distance from it (for example at the
plant start-up).

On alarm intervention, the instrument visualizes the message

“LbA”

and behaves as in the case of a measurement error giving a

power output as programmed on par.

“OPE”

(programmable in

the group

“

]

InP”)

To restore normal functioning after the alarm, select the control
mode “OFF” and then re-program the automatic control (“rEG”)

after checking the correct functioning of probe and drive.
To exclude the Loop Break alarm, set “OLbA” = OFF.

4.17 - FUNCTIONING OF KEY “U”

The function of key “U” can be set through par.

“USrb”

contained

in the group “

“

]

PAn”.

The parameter can be programmed as :

= noF

: no function

= tunE

: Pushing the key for 1 sec. at least, it is possible to

activate/deactivate Auto-tuning or Self-tuning

= OPLO

: Pushing the key for 1 sec. at least, it is possible to swap

from automatic control (rEG) to manual one (OPLO) and vice

versa.

= Aac

: Pushing the key for 1 sec. at least, it is possible to

acknowledge the alarm. (see par. 4.14)

= ASi

: Pushing the key for 1 sec. at least, it is possible to

acknowledge an active alarm (see par. 4.14)

= CHSP

: Pushing the key for 1 sec. at least, it is possible to select

one of the 4 pre-programmed Set Points on rotation.

= OFF

: Pushing the key for 1 sec. at least, it is possible to swap

from automatic control (rEG) to OFF control (OFF) and vice versa.

4.18 - DIGITAL INPUT

The instrument is equipped with 2 digital inputs whose function can
be set by the parameter

"diF"

contained in the group

“

]

InP”.

The parameter can be programmed as:

= noF

: the input does not carry out any function

= AaC

: By closing the contact connected to the digital input, it is

possible to reset a memorised alarm (see par. 4.14)

= ASi:

By closing the contact connected to the digital input, it is

possible to silence an active alarm (see par. 4.14)

HoLd

: By closing the contact connected to the digital input the

measurement taken at that moment is blocked (N.B.: not the
reading on the display, therefore the indication may stabilise itself

with a delay that is proportional to the measuring filter). With the
hold function turned on, the instrument carries out control

according to the memorised measurement. By opening the contact,
the instrument starts normal measurement acquisition once more.

= OFF

: When the instrument is in “rEG” status, by closing the

contact connected to the digital input, the instrument is placed in
OFF status. By reopening the contact, the instrument returns to the

automatic control status “rEG”.

= CHSP

: by closing and reopening the contact connected to the

digital input, it is possible to select one of the 4 memorised set

points in rotation.

= SP1.4

: The following combination of the connected contacts to

the two digital entries allows the activation of one of the 4

memorized set points.

SP4

SP3

off

SP2

off

SP1

off

SET POINT

DIG IN2

DIG IN1

The function can be activated using “nSP” = 4 , also, when it is acti-
vated, it disables the selection of the active set by the parameter

“SPAt” and by the key U.

= HE.Co

: by closing the contact connected to the digital input it is

possible to select as active the set point SP2 in “CooL” mode. Reo-

pening the contact is select as active the set point SP1 in “HEAt”
mode. This function is possible only when “nSP” = 2.

4.19 - RS 485 SERIAL INTERFACE

The instrument can be equipped with a RS 485 serial

communication interface, by means of which it is possible to
connect the regulator with a net to which other instruments

(regulators of PLC) are connected, all depending typically on a
personal computer used as plant supervisor. Using a personal

computer it is possible to acquire all the function information and to
program all the instrument’s configuration parameters. The

software protocol adopted for TLK94 is a MODBUS RTU type,

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 11

widely used in several PLC and supervision programs available on
the market (protocol manual is available on request).

The interface circuit allows the connection of up to 32 instruments
on the same line.

To maintain the line in rest conditions a 120 Ohm resistance (Rt)
must be connected to the end of the line.

The instrument is equipped with two terminals called A and B which
have to be connected with all the namesake terminals of the net.

For the wiring operation it is advisable to adopt a screened cable
wired as in the drawing.

TLK94 n.2

TLK94 n.1

GND

TLK94 n.N

GND

shield

Interface

RS485

GND

HOST

(PC/PLC)

120 ohm

3a 2a 1a

If the instrument is equipped with a serial interface, the parameters

to be programmed are the following, all present in the parameters
group

“

]

SEr”

"Add"

: Address of the station. Set a different number for each

station, from 1 to 255.

"baud"

: Transmission speed (baud-rate), programmable from

1200 to 38400 baud. All the stations have to have the same
transmission speed.

"PACS"

: Programming access. If programmed as "LoCL" this

means that the instrument is only programmable from the
keyboard, if programmed as "LorE" it is programmable both from

the keyboards and serial line.
If an attempt is made to enter the programming from the keyboard

whilst a communication through the serial port is in progress the
instrument will visualise

"buSy"

to indicate the busy state.

4.20 - PARAMETERS CONFIGURATION BY “ A01”

The instrument is equipped with a connector that allows the trans-
fer from and toward the instrument of the functioning parameters
through the device

TECNOLOGIC A01

with

5 poles

connector.

This device it’s mainly useable for the serial programming of the
instruments which need to have the same parameters configuration

or to keep a copy of the programming of an instrument and allow its
rapid retransmission. To use the device A01 it’s necessary that the
device or instrument are being supplied.

Instrument supplied and device not supplied

SUPPLY

Instrument supplied from the device

ADAPTER

SUPPLY

AC SUPPLY

12 VDC

P.A.:

For the instruments equipped with RS485 serial

communication, it’s indispensable that the parameter “PACS” is
programmed = LorE.
For additional info, please have a look at the A01 instruction
manual.

5 - PROGRAMMABLE PARAMETERS TABLE

Here following are described all the parameters available on the

instrument. Some of them could be not present or because they
are depending on the type of instrument or because they are

automatically disabled as unnecessary.

Group “

]

SP”

(parameters relative to the Set Point)

9999

SPLL ÷ 9999

Set Point massimo

SPHL

-1999

-1999 ÷ SPHL

Set Point minimo

SPLL

SPLL ÷ SPHL

Set Point 4

SP4

SPLL ÷ SPHL

Set Point 3

SP3

SPLL ÷ SPHL

Set Point 2

SP2

SPLL ÷ SPHL

Set Point 1

SP1

1 ÷ nSP

Set point Attivo

SPAt

1 ÷ 4

Numero Set point

programmabili

nSP

Note

Def.

Range

Description

Par.

Gruppo “

]

InP”

(parametri relativi agli ingressi)

tc :

J/ CrAL/ S/ b/

E/ L/ n/ r/ t/ C/

Ir.J / Ir.CA

rtd :

Pt1 / Ptc / ntc

I :

0.20 / 4.20

UoLt :

0.50 / 0.60 /

12.60 / 0.5 /

1.5 / 0.10 /

2.10

Probe type:

J=thermocoupled J
CrAL=thermocoupled K

S=thermocoupled S
b=thermocoupled B

E=thermocoupled E
n=thermocoupled N

r=thermocoupled R
t=thermocoupled T

C=thermocoupled C
Ir.J=IR Sen. IRS J

Ir.CA=IR Sen. IRS K
Pt1=thermores. Pt100

0.50= 0..50 mV
0.60= 0..60 mV

12.60= 12..60 mV
Ptc= PTC KTY81-121

ntc= NTC 103-AT2
0.20= 0..20 mA

4.20= 4..20 mA
0.1= 0..1 V

0.5=0..5 V
1.5= 1..5 V

0.10= 0..10 V
2.10= 2..10 V

SEnS

tc / rtd / I /

UoLt / SEr

Input type

HCFG

Note

Def.

Range

Descrizione

Par.

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 12

noF

noF / AaC /

ASi / HoLd /

OFF / CHSP /

SP1.4 /HE.Co

Digital input s function:

noF = No Function
Aac= Reset Alarms

latch
ASi= Aknowledged

Alarms
HoLd = Hold Measure

OFF= Control OFF
CHSP = Sel. Set Point

SP1.4 = Sel. SP1,2,3,4
HE.Co = Sel. Heat-

SP1/Cool -SP2

diF

-100 ÷ 100

Output power in case of

measuring error

OPE

OUr

OUr / Or / Ur

“OPE” functioning in

case of measuring error
OUr = Over and

under-range
Or = Over-range only

Ur = Under-range only

InE

1.000

0.000 ÷ 2.000

Rotation of the

measuring straight line

rot

-1999 ÷ 9999

Measuring Offset

OFSt

0.2

0FF÷ 20.0

sec.

Input digital filter

FiL

°C

tc/rtd :

°C / °F

Temperature unit of
measurement

Unit

tc/rtd :

0 / 1

UoLt / I / SEr:

0 ÷ 3

Number of decimal

figures

SSC ÷ 9999

High scale limit in case
of input with V / I

signals

FSC

-1999 ÷ FSC

Low scale limit in case

of input with V / I
signals

SSC

1.00

0.10 ÷ 1.00

Reflection coefficient

for IRS sensors

rEFL

Group “

]

Out”

(parameters relative to the outputs)

0 / no_0

Beginning of output 2
scale if analogical type

Aor2

OFF

1.rEG / 2.rEG

ALno / ALnc

On / OFF

Functioning of output 2

if digital type:
see “O1F”

O2F

Ao1L ÷ 9999

Maximum reference for

analogical output 1 for
signal retransmission

Ao1H

-1999 ÷ Ao1H

Minimum reference for
analogical output 1 for

signal retransmission

Ao1L

1.rEG

1.rEG / 2.rEG

r.inP / r.Err

r.SP / r.SEr

OFF

Functioning of output 1

if analogue type:
1.rEG= Control output 1

2.rEG= Control output 2
r.inP= measur. retrans.

r.Err=error [SP-PV] retr.
r.SP=Set Point retr.

r.SEr=out by ser. com.
OFF=no funct.

Ao1F

0 / no_0

Beginning of output 1

scale if analogical type

Aor1

1.rEG

1.rEG / 2.rEG

ALno / ALnc

On / OFF

Func. digital output 1:
1.rEG= Control output 1

2.rEG= Control output 2
ALno= Alarm Out nor-

mally opened
ALnc= Alarm Out nor-

mally closed
On = Output on

OFF= Output off

O1F

Note

Def.

Range

Description

Par.

1.rEG / 2.rEG

ALno / ALnc

On / OFF

Functioning of output 6:

see “O1F”

O6F

OFF

1.rEG / 2.rEG

ALno / ALnc

On / OFF

Functioning of output 5:

see “O1F”

O5F

OFF

1.rEG / 2.rEG

ALno / ALnc

On / OFF

Functioning of output 4:
see “O1F”

O4F

OFF

1.rEG / 2.rEG

ALno / ALnc

On / OFF

Functioning of output 3:

see “O1F”

O3F

Ao2L ÷ 9999

Maximum reference for
analogical output 2 for

signal retransmission

Ao2H

-1999 ÷ Ao2H

Minimum reference for

analogical output 2 for
signal retransmission

Ao2L

OFF

1.rEG / 2.rEG

r.inP / r.Err

r.SP / r.SEr

OFF

Functioning of output 2

if analogue type:
see “Ao1F”

Ao2F

Group “

]

AL1”

(parameters relative to alarm AL1)

no / yES

Alarm AL1 activation in
case of measuring error

AL1i

OFF

OFF ÷ 9999

sec.

Activation delay of
alarm AL1

AL1d

OFF ÷ 9999

Alarm AL1 hysteresis

HAL1

9999

AL1L ÷ 9999

High threshold band
alarm AL1 or Maximum

set alarm AL1 for high
or low alarm

AL1H

-1999

-1999 ÷ AL1H

Low threshold band
alarm AL1 or Minimum

set alarm AL1 for high
or low alarm

AL1L

AL1L÷ AL1H

Alarm AL1 threshold

AL1

0 ÷ 15

Alarm AL1 functioning:

+1 = not activated at
power on

+2 = delayed
+4 = latch

+8 = aknowledged

Ab1

LoAb

LoAb / HiAb

LHAb / LodE

HidE / LHdE

Alarm AL1 type:
LoAb= Absolute Low

HiAb= Absolute High
LHAb= Absolute Band

LodE= Deviation Low
HidE= Deviation High

LHdE= Deviation Band

AL1t

Out2

Out1 / Out2

Out3 / Out4 /

Out5 / Out6 /

OFF

Output where alarm
AL1 is addressed

OAL1

Note

Def.

Range

Description

Par.

Group “

]

AL2”

(parameters relative to alarm AL2)

-1999

-1999 ÷ AL2H

Low threshold band

alarm AL2 or Minimum
set alarm AL2 for high

or low alarm

AL2L

AL2L÷ AL2H

Alarm AL2 threshold

AL2

0 ÷ 15

Alarm AL2 functioning:
see “Ab1”

Ab2

LoAb

LoAb / HiAb

LHAb / LodE

HidE / LHdE

Alarm AL2 type:

see “AL1t”

AL2t

OFF

Out1 / Out2

Out3 / Out4 /
Out5 / Out6 /

OFF

Output where alarm

AL2 is addressed

OAL2

Note

Def.

Range

Description

Par.

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 13

no / yES

Alarm AL2 activation in

case of measuring error

AL2i

OFF

OFF ÷ 9999

sec.

Activation delay of

alarm AL2

AL2d

OFF ÷ 9999

Alarm AL2 hysteresis

HAL2

9999

AL2L ÷ 9999

High threshold band

alarm AL2 or Maximum
set alarm AL2 for high

or low alarm

AL2H

Group “

]

AL3”

(parameters relative to alarm AL3)

no / yES

Alarm AL3 activation in
case of measuring error

AL3i

OFF

OFF ÷ 9999

sec.

Activation delay of
alarm AL3

AL3d

OFF ÷ 9999

Alarm AL3 hysteresis

HAL3

9999

AL3L ÷ 9999

High threshold band

alarm AL3 or Maximum
set alarm AL3 for high

or low alarm

AL3H

-1999

-1999 ÷ AL3H

Low threshold band

alarm AL3 or Minimum
set alarm AL3 for high

or low alarm

AL3L

AL3L÷ AL3H

Alarm AL3 threshold

AL3

0 ÷ 15

Alarm AL3 functioning:

see “Ab1”

Ab3

LoAb

LoAb / HiAb

LHAb / LodE

HidE / LHdE

Alarm AL3 type:
see “AL1t”

AL3t

OFF

Out1 / Out2

Out3 / Out4 /

Out5 / Out6 /

OFF

Output where alarm
AL3 is addressed

OAL3

Note

Def.

Range

Description

Par.

Group “

]

AL4”

(parameters relative to alarm AL4)

no / yES

Alarm AL4 activation in

case of measuring error

AL4i

OFF

OFF ÷ 9999

sec.

Activation delay of

alarm AL4

AL4d

OFF ÷ 9999

Alarm AL4 hysteresis

HAL4

9999

AL4L ÷ 9999

High threshold band
alarm AL4 or Maximum

set alarm AL4 for high
or low alarm

AL4H

-1999

-1999 ÷ AL4H

Low threshold band
alarm AL4 or Minimum

set alarm AL4 for high
or low alarm

AL4L

AL4L÷ AL4H

Alarm AL4 threshold

AL4

0 ÷ 15

Alarm AL4 functioning:
see “Ab1”

Ab4

LoAb

LoAb / HiAb

LHAb / LodE

HidE / LHdE

Alarm AL4 type:

see “AL1t”

AL4t

OFF

Out1 / Out2

Out3 / Out4 /

Out5 / Out6 /

OFF

Output where alarm
AL4 is addressed

OAL4

Note

Def.

Range

Description

Par.

Group “

]

LbA”

(parameters relative to Loop Break Alarm)

OFF

OFF ÷ 9999

sec.

Time necessary to acti-

vate alarm LbA

LbAt

OFF

Out1 / Out2

Out3 / Out4 /
Out5 / Out6 /

OFF

Output where alarm

LbA is addressed

OLbA

Note

Def.

Range

Description

Par.

Group “

]

Hb”

(parameters relative to Heater Break Alarm)

OFF

Out1 / Out2

Out3 / Out4 /

Output where alarm HB
is addressed

OHb

Note

Def.

Range

Description

Par.

100.0

IHbL ÷ IFS

High alarm HB

threshold (with Out
1.rEG OFF)

IHbH

0.0

0.0 ÷ IFS

Low alarm HB threshold

(with Out 1.rEG ON)

IHbL

1 / 2 / 3 / 4

HB Alarm function:

1= Min. 1.rEG on
2=Max. 1.rEG off

3= Min. 1.rEG on and
Max. 1.rEG off

4= Max and Min.

HbF

100.0

0.0 ÷ 100.0

High scale limit for input

TA HB

IFS

Out5 / Out6 /

OFF

Group “

]

rEG”

(parameters relative to control)

0 ÷ ro1.H

Minimum power in
output from 1.rEG

ro1.L

InF

0.00 ÷ 99.99

/ InF

unit / min.

Gradient of second

ramp:
InF= Ramp not active

SLoF

InF

0.00 ÷ 99.59

/ InF

hrs.-min.

Duration time between

two ramps
InF= Time not active

dur.t

InF

0.00 ÷ 99.99

/ InF

unit/min.

Gradient of first ramp :
InF= Ramp not active

SLor

no /

cLoS / oPEn

Switch on position for
motorised actuator

PoSI

0.0

0.0 ÷ 10.0 %

Minimum value for

motorised actuator
control

SHrI

4 ÷ 1000 sec.

Time for motorised

actuator run

tcor

0.0

-100.0÷100.0

Manual reset

10.0

0.1 ÷ 130.0

sec.

Cycle time of 2.rEG

tcr2

1.00

0.01 ÷ 99.99

Power ratio 2rEG/1rEG

Prat

20.0

0.1 ÷ 130.0

sec.

Cycle time of output
1.rEG

tcr1

0.5

0.00 ÷ 2.00

Fuzzy overshoot control

FuOc

OFF÷ 9999

sec.

Derivative time

dEr

200

OFF ÷ 9999

sec.

Integral time

Int

0 ÷ 9999

Proportional band

no / yES

Selftuning enable

SELF

-4 / -3 / -2 / -1

0 /

1 / 2 / 3 / 4

Autotuning enable
FAST (positive values),

OSCILLATING
(negative values)

OFF = Not active
1 = Start each power on

2= Start at first power
on

3= Start manually
4= Start after Soft Start

or Set change

Auto

0 ÷ 9999

Hysteresis of ON/OFF

control (or end Soft
Start cycle threshold)

HSEt

HEAt

HEAt / CooL

Functioning mode

output 1.rEG

Func

Pid

Pid / On.FA

On.FS / nr

3 Pt

Control type:

Pid= PID
On.FA= ON/OFF asym.

On.FS= ON/OFF sym.
nr= Neutral Zone

3Pt= PID mot. act.

Cont

Note

Def.

Range

Description

Par.

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 14

OFF

OFF /

0.1÷7.59

/ InF

hrs.-min.

Soft-Start time

SSt

107

-100 ÷ 100 %

Soft-Start power

St.P

106

-100 ÷ 100 %

Split Range Power

threshold of output
2.rEG

thr2

105

-100 ÷ 100 %

Split Range Power

threshold of output
1.rEG

thr1

104

InF

1 ÷ 50 / InF

% / sec.

Power variation speed

in output from 2.rEG

OPS2

103

InF

1 ÷ 50 / InF

% / sec.

Power variation speed

in output from 1.rEG

OPS1

102

100

ro2.L ÷ 100

Maximum power from

output from 2r.EG

ro2.H

101

0 ÷ ro2.H

Minimum power in

output from 2.rEG

ro2.L

100

ro1.L ÷ 100

Maximum power from

output from 1.rEG

ro1.H

Group “

]

PAn”

(parameters relative to the user interface)

SAE

SE / AE /

SAE / SAnE

Fast progr. Active Set

and alarms:
SE= Active Set can be

modified while the
alarm thresholds can-

not be modified
AE= Active Set cannot

be modified while the
alarm thresholds can

be modified
SAE= Active Set and

alarm thresholds can
be modified

SAnE= Active Set and
alarm thresholds can-

not be modified

Edit

110

SP.F

OFF / Pou /

SP.F / SP.o /

AL1 / AL2 /

AL3 / AL4

Variable visualized on
the display SV:

OFF= Display OFF
Pou= Control Power

SP.F= Active Set Value
SP.o = Operative Set

value
AL1 = AL1 threshold

AL2 = AL2 threshold
AL3 = AL3 threshold

AL4 = AL4 threshold

diSP

109

noF

noF / tunE /

OPLO / Aac /

ASi / CHSP /

OFF

Functioning of key “U” :
noF = No Function

tune= Start Autotuning
or Selftuning

OPLO= Manual Control
(open loop)

Aac= Reset Alarms
latch

ASi= Aknowledged
Alarms

OFF= Control OFF

USrb

108

Note

Def.

Range

Description

Par.

Group “

]

SEr”

(parameters relative to the serial communication)

LorE

LoCL / LorE

Access at the

programming through
serial port:

LoCL = No (Local only)

PACS

113

9600

1200 / 2400 /

9600 / 19.2 /

38.4

Transmission speed

(Baud rate)

baud

112

0 … 255

Station address in case

of serial communication

Add

111

Note

Def.

Range

Description

Par.

LorE = Yes (Local and
remote progr.)

6 - PROBLEMS, MAINTENANCE AND GUARANTEE

6.1 - ERROR SIGNALLING

Push key “P”

Possible anomaly of
the EEPROM memory

ErEP

Check the working of
probe and actuator and

swap the instrument to
(rEG) control

Loop control
interrupted

(Loop break alarm)

LbA

Check the functioning of
probe and actuator and try

to repeat the auto-tuning.

Auto-tuning not
finished within 12

hours

noAt

Push key “P” in order to

make the error message
disappear. Once the error

has been found, try to
repeat the auto-tuning.

FAST Autotuning not

possible because the
process value is too

higher or too lower

ErAt

The measured variable

is over the probe’s
limits (over-range)

oooo

The measured variable
is under the probe’s

limits (under-range)

uuuu

Verify the correct

connection between probe
and instrument and then

verify the correct
functioning of the probe

Probe interrupted

- - - -

Action

Reason

Error

In error conditions, the instrument provides an output power as
programmed on par “OPE” and activates the desired alarms, if the
relative parameters “ALni” have been programmed = yES.

6.2 - CLEANING

We recommend cleaning of the instrument with a slightly wet cloth
using water and not abrasive cleaners or solvents which may

damage the instrument.

6.3 - GUARANTEE AND REPAIRS

The instrument is under warranty against manufacturing flaws or

faulty material, that are found within 12 months from delivery date.
The guarantee is limited to repairs or to the replacement of the

instrument.
The eventual opening of the housing, the violation of the instrument

or the improper use and installation of the product will bring about
the immediate withdrawal of the warranty’s effects.

In the event of a faulty instrument, either within the period of
warranty, or further to its expiry, please contact our sales

department to obtain authorisation for sending the instrument to
our company.

The faulty product must be shipped to TECNOLOGIC with a
detailed description of the faults found, without any fees or charge

for Tecnologic, except in the event of alternative agreements.

7 - TECHNICAL DATA

7.1 - ELECTRICAL DATA

Power supply: 24 VAC/VDC, 100... 240 VAC +/- 10%
Frequency AC: 50/60 Hz

Power consumption: 10 VA approx.
Input/s: 1 input for temperature probes: tc J,K,S,B,C,E,L,N, R,T; in-

frared sensors TECNOLOGIC IRS J and K range A ; RTD Pt 100
IEC; PTC KTY 81-121 (990

Ω

@ 25 °C); NTC 103AT-2 (10K

Ω

25 °C) or mV signals 0...50 mV, 0...60 mV, 12 ...60 mV or
normalized signals 0/4...20 mA, 0/1...5 V , 0/2...10 V.

1 input for current transformer (50 mA max.)
2 digital inputs for free voltage contact
Impedance normalized signals input: 0/4..20 mA: 51

Ω

;

mV and V: 1 M

Ω

Output/s: Up to 6 digital outputs. OUT1: SPST-NO (6 A-AC1, 3 A-
AC3 / 250 VAC), OUT2,3,4,5:SPST-NO (4 A-AC1, 2 A-AC3 / 250

VAC),or in tension to drive SSR (12 VDC / 20 mA).

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 15

Up to 2 analogue outputs: 0/4 ..20 mA (Load Max. 300

Ω

) or 0/2

..10 V.

Auxiliary supply output / OUT6: 12 VDC / 20 mA Max.
Electrical life for relay outputs: 100000 operat.

Installation category: II
Measurement category: I

Protection class against electric shock: Class II for Front panel
Insulation:

Reinforced insulation between the low voltage section

(supply and relay outputs) and the front panel; Reinforced

insulation between the low voltage section (supply and relay
outputs) and the extra low voltage section (inputs, analogue

outputs, SSR outputs); analogue and SSR outputs optoisolated
respect to the input. 50 V insulation between RS485 and extra low
voltage section.

7.2 - MECHANICAL DATA

Housing: Self-extinguishing plastic, UL 94 V0
Dimensions: 48 x 96 mm DIN, depth 98 mm

Weight: 260 g approx.
Mounting: Flush in panel in 45 x 92 mm hole

Connections: 2 x 1 mm

screw terminals block

Degree of front panel protection : IP 54 mounted in panel with

gasket
Pollution situation: 2

Operating temperature: 0 ... 50 °C
Operating humidity: 30 ... 95 RH% without condensation

Storage temperature: -10 ... +60 °C

7.3 - MECHANICAL DIMENSIONS, PANEL CUT-OUT AND
MOUNTING [mm]

TUN

SET

Out6

TLK 94

Out1 Out2 Out3

Out5

Out4

97,5

89,5

PANEL CUTOUT

RECOMMENDED

min. 10 mm

min

. 2

0 mm

PANEL + GASKET

MAX. 8 mm

BRACKETS

7.4 - FUNCTIONAL FEATURES

Control: ON/OFF, single and double action PID, PID

for motorized

actuators with time positioning
Measurement range: according to the used probe (see range table)

Display resolution: according to the probe used 1/0,1/0,01/0,001
Overall accuracy: +/- (0,2 % fs + 1 digit); PTC/NTC: +/- (0,5 % fs +

1 digit)
Max. cold junction compensation drift (in tc) : 0,04 °C/°C with

operating temperature 0 ... 50 °C after warm-up of 20 min.
Sampling rate: 130 ms.

Serial Interface : RS485 insulated
Communication protocol: MODBUS RTU (JBUS)

Baud rate: Programmable from 1200 ... 38400 baud
Display: Display: 4 digit, 1 Red (PV) h 10mm and 1 green (SV), h

7,5 mm
Compliance: ECC directive EMC 2004/108/CE (EN 61326), ECC

directive LV 2006/95/CE (EN 61010-1).

7.5 - MEASURING RANGE TABLE

-46.0 ... 785.0 °C

-50.8 ... 999.9 °F

-46 ... 785 °C

-50 ... 1445 °F

IRS range “A”

“HCFG” = tc

“SEnS”= Ir.J - Ir.CA

0.0 ... 999.9 °C

32.0 ... 999.9 °F

0 ... 2320 °C

32 ... 4208 °F

tc C

“HCFG” = tc

“SEnS” = C

-199.9 ... 400.0 °C

-199.9 ... 752.0 °F

-250 ... 400 °C

-418 ... 752 °F

tc T

“HCFG” = tc

“SEnS” = t

-50.0 ... 999.9 °C

-58.0 ... 999.9 °F

-50 ... 1760 °C

-58 ... 3200 °F

tc R

“HCFG” = tc

“SEnS” = r

-199.9 ... 999.9 °C

-199.9 ... 999.9 °F

-250 ... 1300 °C

-418 ... 2372 °F

tc N

“HCFG” = tc

“SEnS” = n

-150.0 ... 900.0 °C

-199.9 ... 999.9 °F

-150 ... 900 °C

-252 ... 1652 °F

tc L

“HCFG” = tc

“SEnS” = L

-150.0 ... 750.0 °C

-199.9 ... 999.9 °F

-150 ... 750 °C

-252 ... 1382 °F

tc E

“HCFG” = tc

“SEnS” = E

72.0 ... 999.9 °C

162.0 ... 999.9 °F

72 ... 1820 °C

162 ... 3308 °F

tc B

“HCFG” = tc

“SEnS” = b

0.0 ... 999.9 °C

32.0 ... 999.9 °F

0 ... 1760 °C

32 ... 3200 °F

tc S

“HCFG” = tc

“SEnS” = S

-100.0 ... 999.9 °C

-148.0 ... 999.9 °F

-100 ... 1370 °C

- 148 ... 2498 °F

tc K

“HCFG” = tc

“SEnS” = CrAl

-160.0 ... 999.9 °C

-199.9 ... 999.9 °F

-160 ... 1000 °C

- 256 ... 1832 °F

tc J

“HCFG” = tc

“SEnS” = J

“dP”= 1, 2, 3

“dP” = 0

INPUT

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 16

-199.9 ... 999.9
-19.99 ... 99.99

-1.999 ... 9.999

-1999 ... 9999

2 ... 10 V

“HCFG” = UoLt

“SEnS” = 2.10

-199.9 ... 999.9
-19.99 ... 99.99

-1.999 ... 9.999

-1999 ... 9999

0 ... 10 V

“HCFG” = UoLt

“SEnS” = 0.10

-199.9 ... 999.9
-19.99 ... 99.99

-1.999 ... 9.999

-1999 ... 9999

1 ... 5 V

“HCFG” = UoLt

“SEnS” = 1.5

-199.9 ... 999.9
-19.99 ... 99.99

-1.999 ... 9.999

-1999 ... 9999

0 ... 5 V

“HCFG” = UoLt

“SEnS” = 0.5

-199.9 ... 999.9
-19.99 ... 99.99

-1.999 ... 9.999

-1999 ... 9999

12 ... 60 mV

“HCFG” = UoLt
“SEnS” = 12.60

-199.9 ... 999.9
-19.99 ... 99.99

-1.999 ... 9.999

-1999 ... 9999

0 ... 60 mV

“HCFG” = UoLt

“SEnS” = 0.60

-199.9 ... 999.9
-19.99 ... 99.99

-1.999 ... 9.999

-1999 ... 9999

0 ... 50 mV

“HCFG” = UoLt

“SEnS” = 0.50

-199.9 ... 999.9
-19.99 ... 99.99

-1.999 ... 9.999

-1999 ... 9999

4..20 mA

“HCFG” = I

“SEnS” = 4.20

-199.9 ... 999.9

-19.99 ... 99.99
-1.999 ... 9.999

-1999 ... 9999

0..20 mA

“HCFG” = I

“SEnS” = 0.20

-50.0 ... 110.0 °C
-58.0 ... 230.0 °F

-50 ... 110 °C
-58 ... 230 °F

NTC (103-AT2)

“HCFG” = rtd
“SEnS” = ntc

-55.0 ... 150.0 °C

-67.0 ...302.0 °F

-55 ... 150 °C
-67 ... 302 °F

PTC (KTY81-121)

“HCFG” = rtd
“SEnS” = Ptc

-199.9 ... 850.0 °C

-199.9 ... 999.9 °F

-200 ... 850 °C

-328 ... 1562 °F

Pt100 (IEC)

“HCFG” = rtd
“SEnS” = Pt1

7.6 - INSTRUMENT ORDERING CODE

TLK94 a b c d e f g h i j kk ll m

a : POWER SUPPLY
L

= 24 VAC/VDC

= 100 ... 240 VAC

b : OUTPUT OUT1
R

= OUT1 Relay

= OUT1 VDC for SSR

= OUT1 analog. 0/4 ..20 mA

= OUT1 analog. 0/2 .. 10 V

c : OUTPUT OUT2
R

= OUT2 Relay

= OUT2 VDC for SSR

= OUT1 analog. 0/4 ..20 mA

= OUT1 analog. 0/2 .. 10 V

= (No OUT2)

d : OUTPUT OUT3
R

= OUT3 Relay

= OUT3 VDC for SSR

= (No OUT3)

e : OUTPUT OUT4
R

= OUT4 Relay

= OUT4 VDC for SSR

= (No OUT4)

f : OUTPUT OUT5
R

= OUT5 Relay

= OUT5 VDC for SSR

= (No OUT5)

g : COMMUNICATION INTERFACE AND CURRENT
TRANSFORMER INPUT
S

= RS 485 Serial interface

= Current Trasformer input

=RS 485 Serial interface + Current Trasformer input

= (No RS485, No TA in)

h, i, j : INTERNAL CODES

kk, ll : SPECIAL CODES

m : SPECIAL VERSION

P.A. :

The outputs OUT 4, 5 must be the same type (Relay or VDC

for SSR)

TLK 94 PASSWORD = 381

TECNOLOGIC spa - TLK 94

-OPERATING INSTRUCTIONS - Vr.01 - 01/10 - ISTR-MTLK94ENG1 - PAG. 17

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