CG Drives & Automation 01-7318-01r1 Troubleshooting, Diagnoses and Maintenance 149
Table 29 Trip condition, their possible causes and remedial action
Trip condition Possible Cause Remedy
Ext trip
External input (DigIn 1-8) active:
- active low function on the input.
- Check the equipment that initiates the external input
- Check the programming of the digital inputs DigIn 1-8
Comm error Error on serial communication (option)
- Check cables and connection of the
serial communication.
- Check all settings with regard to the serial
communication
- Restart the equipment including the VSI
Over temp
Heatsink temperature too high:
- Too high ambient temperature of the
VSI
- Insufficient cooling
- Too high current
- Blocked or stuffed fans
- Check the cooling of the VSI cabinet.
- Check the functionality of the built-in fans. The fans
must switch on automatically if the heatsink
temperature gets too high. At power up the fans are
briefly switched on.
- Check VSI and motor rating
- Clean fans
Over curr F
Current exceeds the peak VSI current:
- Too high load
-Excessive load change
- Soft short-circuit between phases or
phase to earth
- Poor or loose cable connections
- Check the main supply voltage.
- Check on bad line cable connections
- Check on bad earth cable connection
- Check on water or moisture in the motor housing and
cable connections.
Over volt G(enerator) Too high DC Link voltage
- Check the main supply voltage
- Try to take away the interference cause or use other
main supply lines.
Over volt (Mains)
Too high DC Link voltage, due to too high
mains voltage
- Check the main supply voltage
- Try to take away the interference cause or use other
main supply lines.
O(ver) volt M(ains) cut
Under voltage
Too low DC Link voltage:
- Too low or no supply voltage
- Mains voltage dip due to starting other
major power consuming machines on
the same line.
- Make sure all three phases are properly connected
and that the terminal screws are tightened.
- Check that the DC supply voltage is within the limits of
the VSI.
- Try to use other mains supply lines if dip is caused by
other machinery
Desat
Failure in output stage,
desaturation of IGBTs
- Check on bad line cable connections
- Check on bad earth cable connections
- Check on water and moisture in the
cabinett 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 DC supply voltage is within the limits of
the VSI.
- Try to use other mains supply lines if dip is caused by
other machinery.
Power Fault
One of the PF(Power Fault) trips below has
occured, but could not be determined.
- Check the PF errors and try to determine the cause.
The trip history can be helpful.
PF Fan Err * Error in fan module
- Check for clogged air inlet filters in panel door and
blocking material in fan module.
PF Curr Err
Error in current balancing:
- between different modules.
- between two phases within one module.
- Check LCL - filter
- Check fuses and line connections
PF Overvolt * Error in DC - link
- Check LCL - filter.
- Check fuses and line connections.
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