Honeywell UDC2500 - Manual (Page 184)

Troubleshooting/Service
170 UDC2500 Universal Digital Controller Product Manual 4/07
Procedure #6
Table 7-10 explains how to troubleshoot Alarm Relay Output failure.
Table 7-10 Troubleshooting Alarm Relay Output Failure
Step What to do How to do it
1 Check the alarm configuration
data. If it is correct, check the
field wiring. Reconfigure if necessary.
Refer to Section 3 - Configuration for
details.
2 Check that the applicable alarm
relay actuates properly
depending on what you have set
at prompt AxSxTYPE.
If it does, check the field wiring.
If the alarm type is set for PV, place the
controller in manual mode. Vary the input
to raise and lower the PV around the
setpoint. Listen for a click from the relay
as the PV moves in either direction and
note that the proper ALM1 or ALM2 is lit.
EXAMPLE: If the alarm is set for MAN,
put the controller into manual mode. The
alarm light is ON. Put the controller into
automatic mode and the alarm light is
OFF.
3 Check the contacts. Make sure the NO or NC contact wiring is
correct.
Refer to Section 2 - Installation for relay
contact information.
4 Change the relay and/or the
current output board. Installation instructions supplied with the
new relay or board.
5 Change MCU board. Installation instructions supplied with the
new board.