Honeywell P520 用户手册

P520 SIGNAL PROCESSOR

66-2066—01

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.

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.

Fig. 4. Viewing head wiring.

Table 1. Terminal Descriptions.

Terminal

Description

24VDC power to viewing head

GND

Power Ground

Self-check/shutter drive signal to viewing head

SIG

Flame signal from viewing head

SIG GND

Signal ground

M33509

CABLE CLAMP

CONNECTOR WITH

REAR COVER REMOVED

CONNECTOR

JACKSCREW

FINAL ASSEMBLY

OPTIONAL LTA5XX ADAPTER

CONNECT SHIELD

TO TERM 3

USE SHRINK TUBING

WIRING SIDE VIEW – COVER REMOVED

P520

RED

GREEN

BLACK

WHITE

SHIELD

C20

C28

A24

A26

A28

+24 VDC

GND

SHUTTER

DRIVE

GND

SIGNAL