Troubleshooting/Service
3/07 UDC3500 Universal Digital Controller Product Manual 317
Upper
Display
Lower
Display
Indicators Controller
Output
Probable
Cause
Trouble-
shooting
Procedure
Controller fails to go into “Slave” operation during communications Communications
Failure
RS-485: 7.7.8
Ethernet: 7.7.10
Bad PV Reading Bad In X
Reading
OK OK Analog Input
Failure
7.7.8
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.
7.7 Troubleshooting Procedures
Introduction
The troubleshooting procedures are listed as they appear in Table 7-4. Each procedure
describes what to do if you have that particular failure and how to do it or where to find
the data needed to accomplish the task.
WARNING—SHOCK HAZARD
TROUBLESHOOTING MAY REQUIRE ACCESS TO HAZARDOUS LIVE
CIRCUITS AND SHOULD ONLY BE PERFORMED BY QUALIFIED SERVICE
PERSONNEL. MORE THAN ONE SWITCH MAY BE REQUIRED TO DE-
ENERGIZE UNIT BEFORE SERVICING.
Equipment needed
You will need the following equipment in order to troubleshoot the symptoms listed:
• Multimeter – Capable of measuring millivolts, volts, milliamps and resistance.
• Calibration sources – T/C, mV, Volt, etc.
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