Manual Power Quality Filter PQFM
Troubleshooting guide 217
Fault message
Cause
What to do
Unbalanced
supply
The supply network imbalance
is out of range.
−
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.
Undervoltage
RMS
The RMS value of the supply
voltage measured with the AC
voltage measurement board is
lower than the acceptable
maximum value.
−
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.
Unstable mains
frequ.
The network frequency is
varying too fast.
−
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.
Wrong phase
rotation
The supply network feeding
the filter has the wrong phase
rotation.
−
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).
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.