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Maintenance
Chapter 3: Maintenance
D A N G E R : Always disconnect the Mains power connection before opening the UFM-ST
chassis.
D A N G E R : Before performing any tests, be aware of lethal voltages inside the controller and
at the input and output power connections. A qualified service technician or electrician should
perform these tests.
3.1. Troubleshooting
This section lists some symptoms and causes for problems that may be encountered with the UFM-ST filter.
Table 3-1:
Troubleshooting
Symptom
No voltage output
UFM-ST filter blows
fuses
Fails Hi-pot test
D A N G E R : To minimize the possibility of electrical shock and bodily injury or death,
disconnect power (Mains disconnect) before servicing equipment.
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Possible Cause and Solution
1. Verify AC input voltage is present at AC1 & AC2.
2. Check for blown fuse inside UFM-ST filter. Fuse can be checked by making
continuity check between Input & Output connectors. Resistance between AC
inputs and outputs is less than 1 OHM. There should be no continuity between
AC1, AC2, and Ground.
1. Check UFM-ST output wiring for shorts.
2. Verify that UFM-ST load is not exceeding 10 Amps.
The UFM-ST filter contains MOV's that will cause a Hi-pot failure and could be
damaged by Hi-pot testing. Contact Aerotech concerning Hi-pot testing the
UFM-ST filter.
Chapter 3
UFM-ST Hardware Manual
17
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