78 UDC3300 Limit Controller Product Manual 1/01
7.6 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 7-7 and refer to the
troubleshooting procedure indicated to correct the problem.
Table 7-7 Controller Failure Symptoms
Upper
Display
Lower
Display
Controller
Output
Probable
Cause
Trouble-
shooting
Procedure
Blank Blank None Power Failure 1
OK Lower Display
disagrees with
Latching Output Relay
function
Latching Output Relay
function disagrees
with Lower Display
Latching Output Relay 2
OK OK External Alarm
function does not
operate properly
Malfunction in alarm output 3
Display does not function when a key is pressed Keyboard Malfunction 4
Controller fails to go into “Slave” operation during communications Communications Failure 5
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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