Emotron EMX-D, Instruction Manual

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38 Troubleshooting, Diagnoses and Maintenance Emotron AB 01-5016-01r0
8.3 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 fan which is speed
controlled using heat sink temperature feedback. This
means that the fans are only running if the VSD is running
and on load. The design of the heat sinks is such that the fan
does not blow the cooling air through the interior of the
VSD, but only across the outer surface of the heat sink.
However, running fans will always attract dust. Depending
on the environment the fan and the heat sink will collect
dust. Check this and clean the heat sink 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:
- between different modules.
- between two phases within one module.
- Check motor.
- Check fuses and line connections
PF Overvolt Error in voltage balancing
- Check motor.
- Check fuses and line connections.
PF Int Temp Internal temperature too high Check internal fans
PF Temp Err Malfunction in temperature sensor Contact service
PF DC Err DC-link error and mains supply fault
- Check mains supply voltage
- Check fuses and line connections.
PF Sup Err Mains supply fault
- Check mains supply voltage
- Check fuses and line connections.
Table 10 Trip condition, their possible causes and remedial action
Trip condition Possible Cause Remedy