pm on vfd

[elecguy21]

what would electricians do if ask to do pm on vfd ? what would the type of work would be done? CUTLER HAMMER SV? 9000
type. thanks

 

[mdshunk]

Blow the dust out of it. Good visual inspection. Maybe an IR scan. Check error log, if any.

 

[weressl]

Blow the dust out of it. Good visual inspection. Maybe an IR scan. Check error log, if any.

All very good, but.

Blowing dust with compressed air could be more harmful around circuit boards than the benefit of dust removal. The high velocity air actually embed the dust particles into the conformal coating surface, therefore compromising its integrity. Wherever possible use vacuum.

Change filters and do IR scan when the unit has run at full load for a couple of hours. (IMO, the IR scan is probably the best PM you can do.)

 

[cornbread]

On some of our older drives "Vee Arc" we often change out capactors. On our new drives we do the cleaning along with tight checking all connections.

 

[mikeames]

Compressed air and dust can also induce static which can harm sensitive electronics. Rare, but possible.

 

[zog]

Primary injection test on input breaker
Primary injection test on O.L. relay elements
Insulation Resistance
Check resistance of bolted connections with a microhmeter
Parameter tests, check calibration of:
Input phase loss protetion
Input Overvoltage
Output phase rotation
Overtemp protection
DC overvoltga eprotection
Overfreq protection
Drive O.L protection
Fault alarm outputs
Verify proper grounding
Operational tests to check speeds between min and max and verify set point are within limits of load connected to motor.