Controller Failure Symptoms; Table 7-7 Controller Failure Symptoms - Honeywell UDC3300 Product Manual

7.6

Controller Failure Symptoms

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