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4/00 UDC 3300 Controller Product Manual 253
9.7 Troubleshooting Procedures
Introduction
The troubleshooting procedures are listed in numerical order as they
appear in Table 9-7. Each procedure lists 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 in the tables that follow:
• DC Milliammeter – mAdc
• Calibration sources – T/C, mV, Volt, etc.
• Voltmeter
Procedure #1
Table 9-8 explains how to troubleshoot power failure symptoms.
Table 9-8 Troubleshooting Power Failure Symptoms
Step What to do How to do it
1
Check the AC line voltage. Use a voltmeter to measure the AC
voltage across terminals L1 and L2 on
the rear terminal panel of the
controller.
Check the earth ground connection.
2
Make sure the chassis plugs into
the rear of the case properly.
Withdraw the chassis and visually
inspect the controller board and the
inside of the case.
3
Check the system for Brown-outs,
heavy load switching, etc., and
conformance to installation
instructions.
Refer to Section 2 - Installation.
4
Change PS/Input board. Refer to Table 9-20.
5
Change MCU/Output board. Refer to Table 9-23.