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Wiring the Viewing Head
Wiring of the viewing head is made to the terminals on the rear backplane PCB. These terminals are described as follows:
Fig. 4 and 5 show four-conductor cable to the viewing head. Note that the flame signal wire going to terminal SIG is shielded, and
the shield is terminated at both ends of the cable to SIG GND.
WIRING SIDE VIEW – COVER REMOVED
R
4
3
G
5
2
1
B
W
CONNECT SHIELD
TO TERM 3
USE SHRINK TUBING
IMPORTANT
Source impedance resistor required at the signal processor between SC and SIG GND terminals for proper signal trans-
mission. For resistor value, refer to Wiring of Viewing Head section.
Table 1. Terminal Descriptions.
Terminal
+V
24VDC power to viewing head
GND
Power Ground
SC
Self-check/shutter drive signal to viewing head
SIG
Flame signal from viewing head
SIG GND
Signal ground
CABLE CLAMP
CONNECTOR
JACKSCREW
FINAL ASSEMBLY
OPTIONAL LTA5XX ADAPTER
Fig. 4. Viewing head wiring.
Description
WHITE
SHIELD
CONNECTOR WITH
REAR COVER REMOVED
5
P520 SIGNAL PROCESSOR
P520
RED
+24 VDC
C20
GREEN
GND
C28
SHUTTER
BLACK
A24
DRIVE
GND
A26
A28
SIGNAL
M33509
66-2066—01
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