Emotron AB 01-3694-01r2 Troubleshooting, Diagnoses and Maintenance 149
12.3 Maintenance
The variable speed drive is designed not to require any serv-
icing or maintenance. There are however some things which
must be checked regularly.
All variable speed drives have built-in fans which are auto-
matically switched on if the heatsink temperature reaches
60°C. This means that the fans are only running if the VSD
is running and loaded. The design of the heatsinks is such
that the fan does not blow the cooling air through the inte-
rior of the VSD, but only across the outer surface of the
heatsink. However, running fans will always attract dust.
Depending on the environment the fan and the heatsink
will collect dust. Check this and clean the heatsink and the
fans when necessary.
If variable speed drives are built into cabinets, also check and
clean the dust filters of the cabinets regularly.
Check external wiring, connections and control signals.
Tighten terminal screws if necessary.
Desat
Failure in output stage,
desaturation of IGBTs
- Check on bad motor cable connections
- Check on bad earth cable connections
- Check on water and moisture in the
motor housing and cable connections
Desat U+
Desat U-
Desat V+
Desat V-
Desat W+
Desat W-
Desat BCC
DC link error
DC link voltage ripple exceeds maximum
level
- Make sure all three phases are properly
connected and that the terminal screws
are tightened.
- check that the mains supply voltage is
within the limits of the VSD.
- Try to use other mains supply lines if dip
is caused by other machinery.
PF Curr Err Error in current balancing
-Check motor.
- Check fuses and line connections
PF Overvolt Error in voltage balancing
-Check motor.
- Check fuses and line connections.
PF Comm Err Internal communication error Contact service
PF Int Temp Internal temperature too high Check internal fans
PF Temp Err Malfunction in temperature sensor Contact service
Table 29 Trip condition, their possible causes and remedial action
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