Honeywell UDC2500 - Manual (Page 175)

Troubleshooting/Service
4/07 UDC2500 Universal Digital Controller Product Manual 161
7.3 Power-up Tests
What happens at power-up
When power is applied, the controller will run three diagnostic tests. After these tests are
completed, “TEST DONE” is displayed.
Test Failures
If one or more of these tests fail, the controller will go to the Failsafe Manual Mode, and
FAILSF will flash in the lower display and a message indicating which test failed will
appear in the lower display. Then, “DONE” will appear in the lower display.
Three Position Step test failures
For controller configured for Three Position Step Control with motor position indication
and Auto-cal has never been done, the prompt CAL MTR will appear to suggest that the
controller be calibrated.
7.4 Status Tests
Introduction
When required, the results of these tests can be checked to determine the reason the
controller has gone to Failsafe.
How to check the status tests
The procedure in Table 7-2 tells you how to display the results of the status tests.
Table 7-2 Procedure for Displaying the Status Test (Numeric Code 1200)
Results
Step Operation Press Result
1 Select
STATUS
Set Up Group
Setup Setup
Upper Display = READ
Lower Display = STATUS
2 Read the test
results
Function Function Function
You will see:
Upper Display = NO or YES YES indicates a failure
Lower Display = FAILSAFE
Function Function Function
Upper Display = PASS or FAIL
Lower Display = TEST