
1/03 UDC 6300 Process Controller Product Manual 259
8.6 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 8-7 and refer to the
troubleshooting procedure indicated to correct the problem.
Table 8-7 Controller Failure Symptoms
Upper
Display
Lower
Display
Indicators Controller
Output
Probable Cause Trouble-
shooting
Procedure
Blank Blank Off None Power Failure 1
OK Displayed
Output
disagrees
OK Controller
Output
disagrees
Current
Proportional
Output
2
OK with Controller
Output
OK with Displayed
Output
Time
Proportional
(Digital) Output
3
OK OK OK External Alarm
function does
not operate
properly
Malfunction in
alarm output
4
Display does not function when a key is pressed Keyboard
Malfunction
5
Controller fails to go into “Slave” operation during communications Communications
Failure
6
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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