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04/08 UDC3200 Universal Digital Controller Operator Manual 79
5 Troubleshooting/Service
5.1 Background Tests
The UDC3200 performs ongoing background tests to verify data and memory integrity. If
there is a malfunction, a diagnostic message will be displayed (blinking) in the lower
display. In the case of simultaneous malfunctions, the messages will appear in sequence in
the lower display.
Diagnostic messages may be suppressed (stop the blinking) by pressing the RUN/HOLD
key. The messages will still be available for viewing by pressing the LOWER DISPLAY
key.
Table 5-1 Background Tests
Lower
Display
Reason for Failure How to Correct the Problem
EE FAIL
Unable to write to non-volatile memory.
Anytime you change a parameter and it is
not accepted, you will see E FAIL.
1. Check the accuracy of the parameter and re-enter.
2. Try to change something in configuration.
3. Run through Read STATUS tests to re-write to
EEPROM.
FAILSAFE
This error message shows whenever the
controller goes into a failsafe mode of
operation. This will happen if:
• RAM test failed
• Configuration test failed
• Calibration test failed
• Burnout configured for none and
the input failed.
1. Run through STATUS check to determine the
reason for the failure.
2. Press the
SET UP key until STATUS appears in
the lower display.
3. Press the
FUNCTION key to see whether the tests
pass or fail, then run through the STATUS codes a
second time to see if the error cleared.
INP1 RNG
Input 1 out of range. The process input is
outside the range limits.
1. Make sure the range and actuation are configured
properly.
2. Check the input source.
3. Restore the factory calibration.
4. Field calibrate.
INP1FAIL
Two consecutive failures of input 1
integration; i.e., cannot make analog to
digital conversion. This will happen if:
• Upscale or Downscale burnout is
selected and the input is open
• Input not configured correctly for the
sensor being used
• Input source is grossly out of range.
1. Make sure the actuation is configured correctly.
See Section
3 - Configuration.
2. Make sure the input is correct and that it has not
burned-out (opened).
3. Check for gross over-ranging with a multimeter.
4. Restore factory calibration.
INP2 RNG
Input 2 out of range. The remote input is
outside the range limits.
Same as INP1RNG above.
INP2FAIL
Two consecutive failures of input 2
integration. i.e., cannot make analog to
digital conversion.
Same as INP1FAIL above.
CONF ERR
• PV low limit is > PV high limit
• SP low limit is > SP high limit
• Output low limit > Output high limit
1. Check the configuration for each item and
reconfigure if necessary.