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252 UDC 3300 Controller Product Manual 4/00
9.6 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 9-7 and refer to the
troubleshooting procedure indicated to correct the problem.
Table 9-7 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 Position
Proportional
Output
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
Controller fails to go into “Slave” operation during communications Communications
Failure
8
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.