ABB PQFS Installation, Operation And Maintenance Instructions page 161

Fault message
Undervoltage RMS
Unstable mains frequ.
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.
Cause
The RMS value of the
supply voltage measured
with the AC voltage
measurement board is
lower than the acceptable
maximum value.
The network frequency is
varying too fast.
The supply network feeding
the filter has the wrong
phase rotation.
Manual Power Quality Filter PQFS ç Troubleshooting guide 161
What to do
– 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 PQF-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 PQF-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).