Fault Finding - Honeywell 5701 Operating Instructions Manual

MAN0443.P65 Issue 13 Aug 04
05701-M-5001 A02279
CHAPTER 5 - COMMISSIONING AND
MAINTENANCE INSTRUCTIONS
6.

FAULT FINDING

The following table provides a guide to diagnosing various conditions
within the operation of System 57.
Fault
The Engineering Card front
panel power on ( ) green
LED extinguished.
The Engineering Card front
panel power on ( ) green
LED flashes
approximately two second
intervals.
The Engineering Card front
panel power on ( ) green
LED flashes
approximately 0.5 second
intervals.
No dc voltage output from
Power Supply Unit.
No readings on a control
card display.
Disconnect TB1 and measure the
voltage between the +24V dc and 0V
terminals.
If the voltage is correct, remove the
DC Input Card and check the fuse
FS1.
If the voltage is not correct, check the
system power supply unit.
The dc input voltage is too low.
Check dc voltage at the DC Input Card
at
terminals.
There is a hardware fault.
at
Switch power of and then on again. If
problem
diagnostic printout for error codes
Check that the ac mains voltage is
between 85V and 264V at the power
supply ac connection wires.
If yes, replace the 50W Power Supply
Module.
Remove the respective Field/Relay
Interface Card and check that the fault
LED illuminates.
If the fault LED remains extinguished
and the display still does not read,
replace the control card.
If the fault LED illuminates and the
display starts to operate check the
Field/Relay Interface Card.
5 - 19
5701 Control System
Action
persists, check the