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Leviton FEBC User Manual

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Pages: 10
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TECHNICAL MEMO 

 

Operation 

 

Fluorescent Electronic Ballast Controller 

 

FEBC 

 
 
 
 
 
 

 
 
 
 

 

© Copyright Arpil 2005 Leviton Manufacturing Co., Inc 

Original Document January 1993

 


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FEBC Operation 

Page 2 

 

1.0 SCOPE 

 
This document describes the operation, calibration, and specifications associated with the Fluorescent Electronic 
Ballast Controller (FEBC). 
 
 

2.0 GENERAL DESCRIPTION 

 
The FEBC will provide the function of interface between DMX512, or CMX and solid state electronic ballasts or other 
devices that use a DC control voltage up to 12 Vdc. 
 
Figure 1 shows the block diagram of the FEBC circuit. Note that the contactors are not shown in this diagram. 
 
Containing 4 channels, the FEBC provides 4 analog output signals which may be adjusted to operate at full scale 
between 5Vdc and 12Vdc. There are also four contactor controllers which provide the drive signal associated with air 
gap relay requirements for dimmable fluorcscerlt ballasts. 
 
Dimmer addressing is achieved by selecting the starting dimmer address on the BCD switche's located at the edge 
of the card. 4 consecutive dimmer values are sampled from the optoisolated DMX512, or CMX serial signal and 
processed by the FEBC's microcontroller. 
 
Analog outputs represent a scaled voltage of the 4 dimmer inputs. A potentiometer is adiusted for each channel to 
establish the full scale output voltage. The maximum voltage swilg is. adjustable for an output scale of approx. 0V to 
12 Vdc. 
 
The 8 position DIP switch provides for the following options: 
 

Linear or Square Law output 
Normal/Non-dim select 
Calibration (Full scale output) 
Contactor Disable 

 
There are 4 solid state relays (zero-crossing) provided to supply drive current to off-board air gap contactors. These 
opto-coupled relays require an external power source (typically 115 / 230 Vac) to drive the contactors. It may be 
possible to drive 1 or 2 A.C. loads directly frorn the FEBC controller board and eliminate the contactors for economy 
sake. 
 
Input power is jumper selectable between 115 Vac and 230 Vac @ 50/60 Hz. A primary fuse (1A Slo-blo) is provided 
on-board. 
 

 


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FEBC Operation 

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3.0  HOW TO USE THE FEBC 
 

3.1 Serial Input 

DMX512, and CMX protocols are accepted. This input is opto-isolated. 
 

CMX/DMX Jumper  

Set jumper 2 for desired CMX (E5) or DMX (E4) operation. 

 

Input Termination  

Input termination is not normally required. However, if termination is desired, solder a 100 OHM 1/4W resistor 
into R5 position. 

 

NOTE: Termination is sometimes considered for long input control wire lengths. 

 

Shield Wire Isolation  

 
The shield wire is not normally passed through the FEBC product. Therefor, the receiver and transmitter shield wires 
are not connected togethler. transmitter shield wire is connected to the digital ground in the FEBC. 
 
If it is desired to connect the input shield to the output shield solder a jumper into E6. 
 
 

NOTE: Connecting the input shield to the output shield is not normally required in this product's application. 
This jumper should only be considered in applications where the shield wire is intended to carry a signal. 

 

3.2 Dimmer Selection 

 

 

Any dimmer may be selected as the first dimmer of a group of 4 dimmers. A selection of dimmers 510 through 512 
will default to dimmer 509 (thus eliminationg wrap-around through 00). A selection of 000 will default to dimmer 001. 
 

 


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FEBC Operation 

Page 4 

 

DMX/CMX Channel Selector Switches  

 
Select the starting channel (in decimal) on the rotary switches S1 through S3, Switch S3 is the most significant digit. 
Refer to the chart below for exarmples: 
 
 

S3 S2 S1 

  0 0 1 = Channel 

  0 2 1 = Channel 

21 

  1 2 3 = Channel 

123 

  5 0 9 = Channel 

509 

 

3.3 Option Dipswitch 
 

 

At power-up, the dipswitch (S4) is checked. There are 4 configurable functions described by the dipswitch: 

 
 

POS OFF  ON 

 

DIS 

EN 

Square Law Output Select 

 

DIS 

EN 

NON-DIM Select (All 4 channels) 

 

Not 

Used 

Leave these switches in the off 

 4 

Not 

Used 

 5 

Not 

Used 

 6 

Not 

Used 

position. 

 7 

DIS 

EN 

Calibration 

Select 

 

DIS 

EN 

Relay Driver Disable 

 

Square Law Output (Dipswitch Position #1) 

 
The square law output drives the analog voltage output differently than lineair output. When data is received by the 
FEBC it is converted into the. Square law output. It is theorized that square law compensation matches more closely 
to the sensitivity of the human eye with incandescent lamps. Figure 2 shows a graph of square law output vs linear 
output. 
 

NON-DIM Select 

 
Since there are 4 relay drivers on this product, it is possible to use the FEBC relay drivers instead of the analog 
outputs. By selecting the NON-DIM function (dipswitch position #2), the relay drivers will operate as NON-DIMS 
providing a turn-on threshold which occurs at DMX512 50% output levels. This option does not affect the analog 
outputs. 
 

Calibration 

 
When the power is turned on with dipswitch #7 on, all Outputs Wilt go to full. This will allow for calibration of the 
Output levels Without the need for an input DMX or CMX source. 
 

 


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FEBC Operation 

Page 5 

 

Relay Output Bypass  

 
When switch #8 is selected at power-up, the air-gap relay drivers will be disabled. Analog outputs will continue to 
operate. 
 

3.4 Input Line Voltage 

 
The FEBC is strappable for 115V and 230V 50/60Hz operation. A 1 Amp Slo-blo line fuse is attached to the PCB. 
 
The PCB is fabricated with the 115V operation enabled. To convert to 230V operation, cut both traces at E1 and E2, 
then solder a wire jumper at E3. Use a wire gage of #24 or larger for this jumper. 
 
 

4.0 DEVICES SUPPORTED 

 
The FEBC will support any analog control device which will accept a 0V to 12 Vdc (adjustable maximum) input 
source. The maximum amount of current supplied will not exceed 20mA and therefore the number of analog loads 
must take into account line impedance and output loading. 
 
The FEBC has been tested for use with the following electronic ballasts: 
 

ADVANCE MARK VII - Cat. No. RDC-140-TP (single)  
ADVANCE MARK VII - Cat. No. RDC-240-TP (dual) 

 
The FEBC is also capable of driving other analog loads. However, the, product is not tested with anything other than 
the above ballasts. 
 
 

5.0 CALIBRATION 
 

The FEBC may be adjusted to meet voltage requirements for up to 12Vdc full scale. 
 

5.1 Calibration Procedure 

 
A.  Insure that there is nothing connected to the analog Outputs of the FEBC which may be damaged by voltages 

up to 15Vdc. 

 
B.  Set the option dipswitch to CALIBRATE function. This is switch position #7 On S4. 
 
C.  Supply power to the FEBC. If power was already on when the dipswitch was changed, cycle power off and on 

again to put FEBC into calibrate mode.. All analog outputs go to full levels and the relays Wilt turn on in this 
mode. 

 
D.  Connect a voltmeter between the AN1 terminal and any RET terminal on connector P4. Adjust Potentiometer 

R19 for the desired full-scalce output voltage. 

 
For MARK VII ballasts the Output setting should be approximately 9.0 Vdc. 
 

 


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FEBC Operation 

Page 6 

 

E.  Connect a voltmeter between the AN2 terminal and any RET terminal on connector P4. Adjust Potentiometer 

R20 for the desired full-scale output voltage. 

 
F.  Connect a voltmeter between the AN3 terminal and any RET terminal on connector P4. Adjust Potentiometer 

R21 for the desired full-scale output voltage. 

 
G.  Connect a voltmeter between the AN4 terminal and any RET terminal on connector P4. Adjust Potentiometer 

R22 for the desired full-scale output voltage. 

 
H.  Reset the option dipswitch from the CALIBRATE function. Set switch #7 on S4 to the 'off' position. 
 
I. 

Cycle power off and on again to remove FEBC from calibrate mode. All analog outputs will reflect incoming 
signals or be set to zero levels. 

 

 


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FEBC Operation 

Page 7 

 

6.0 CHARACTERISTICS 

The following specifications are typical design parameters for the Fluorescent Electronic Ballast Controller. 
These characteristics are based upon calculations and are not actually tested. 

 

6.1 Electrical Power Characteristics 
 
Input Power 

115 / 230 Vac 50/60Hz (Strapped) 
 

Data Input 

DMX512, CMX Serial Data 
RS485 compatible 
 

Analog Signal Output 

 

Source Current 

20 mA @ 12 Vdc (short circuit protected) 
 

Sink Current (Advance ballasts use this parameter) 

20 mA @ 2 Vdc 
 

Contactor Drivers 

Opto-coupled Zero Crossing 
1A @ 240 Vac 
 

Contactor Parameters (in packaged FEBC product) 

Normally Open Contacts 
20A @ 120 Vac 
10A @ 240 Vac 
10A @ 277 Vac 
(Derate to 10A for ballasts) 
 

6.2 Physical Characteristics 
 
Temperature 

+32 to +140 degrees Fahrenheit 0 to +60 degrees Centigrade 
 

Humidity 

90% relative humidity (non-condensing) 
 

 


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FEBC Operation 

Page 8 

 

 

 


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FEBC Operation  

Page 9 

LIGHT LEVEL VS PERCENT OUTPUT 

 

 
 
 
 
 

Percent Light 

Level 

Percent Light 

Output 

Percent Light 

Output 

0 0  0 

10 10  1 
20 20  4 
30 30  9 
40 40  16 
50 50  25 
60 60  36 
70 70  49 
80 80  64 
90 90  81 

100 100  100 

 

Linear Scale 

Square Law Scale 

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

Figure 2 

Comparison Between Linear and Square law Light Output

 


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