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Hardware Manual
Chapter 3: Maintenance
IMPORTANT: For your own safety and for the safety of the equipment:
Do not remove the cover of the UFM-ST.
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Do not attempt to access the internal components.
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DANGER: If you must remove the cover and access any internal components be aware
of the risk of electric shock.
1. Disconnect the Mains power connection.
2. Wait at least one (1) minute after removing the power supply before doing
maintenance or an inspection. Otherwise, there is the danger of electric shock.
3. All tests must be done by an approved service technician. Voltages inside the
controller and at the input and output power connections can kill you.
Table 3-1:
Troubleshooting
Symptom
No voltage output
UFM-ST filter blows
fuses
Fails Hi-pot test
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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.
UFM-ST
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