Troubleshooting/Service
12/00 UDC2300 Controller Product Manual 107
10.6 Controller Failure Symptoms
Introduction
In addition to the error message prompts, there are failure symptoms that can be identified
by noting how the controller displays and indicators are reacting.
Symptoms
Compare your symptoms with those shown in Table 10-4.
Table 10-4 Controller Failure Symptoms
Upper
Display
Lower
Display
Indicators Controller
Output
Probable
Cause
Trouble-
shooting
Procedure
Blank Blank Off None Power Failure 1
OK OK Current
Proportional
Output
2
OK OK 3
OK OK
Time
Proportional
Output
4
OK
Displayed
Output
disagrees with
Controller
Output
OK
Controller
Output
disagrees with
Displayed
Output
Current/Time
Proportional
Output
5
OK OK OK External Alarm
function does
not operate
properly
Malfunction in
alarm output
6
Display does not function when a key is pressed Keyboard
Malfunction
7
Other symptoms
If a set of symptoms or prompts other than the one you started with appears while
troubleshooting, re-evaluate the symptoms. This may lead to a different troubleshooting
procedure.
If the symptom still persists, refer to the installation section in this manual to ensure
proper installation and proper use of the controller in your system.
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