ABB PQFM Instruction Manual page 217

Fault message Cause
Unbalanced The supply network imbalance
supply is out of range.
Undervoltage The RMS value of the supply
RMS
voltage measured with the AC
voltage measurement board is
lower than the acceptable
maximum value.
Unstable mains The network frequency is
frequ. varying too fast.
Wrong phase The supply network feeding
rotation
the filter has the wrong phase
rotation.
Remark:
If the problem persists, contact your ABB service provider. Provide him with all the relevant
information, i.e. Filter serial number and type, status of the control LEDs, Error messages
displayed and filter behavior.
What to do
- Measure the three line voltages and
check if they are within limits including
the imbalance limit.
- Measure the line voltages (e.g.
voltmeter) and compare them with the
line voltages given by the filter (PQF-
Manager or PQ-Link).
- Ensure that the AC voltage is properly
measured. Do the checks discussed for
the 'Loss of phase' fault.
- Check the earth of the unit.
- Measure the three line voltages and
check if they are within limits.
- Measure the line voltages (e.g.
voltmeter) and compare them with the
line voltages given by the filter (PQF-
Manager or PQ-Link).
- Ensure that the AC voltage is properly
measured. Do the checks discussed for
the 'Loss of phase' fault.
- Measure the network frequency and its
variation, and check if they are within
limits.
- Check the phase rotation (only in case
of modification at the installation).
- Ensure that the AC voltage is properly
measured. Do the checks discussed for
the 'Loss of phase' fault.
- Check the phase rotation of the filter
supply.
- Measure the three line voltages and
check if they are within limits.
- Measure the line voltages (e.g.
voltmeter) and compare them with the
line voltages given by the filter (PQF-
Manager or PQ-Link).
- Check the AC voltage measurement
connectors (P6-1 to and P6-4) for loose
connections and component damage.
- Check the connections between the
auxiliary fuses and the AC voltage
measurement connectors (P6-1 to and
P6-4).
Manual Power Quality Filter PQFM ç Troubleshooting guide 217