ABB PQFS Installation, Operation And Maintenance Instructions page 159

Fault message
No synchronization
Out of mains freq. Limit
Overvolt. Transient (SW)
Cause
The system cannot
synchronize on to the network.
The supply frequency has
changed too much or too fast.
No/low voltage measured
during filter initialization.
Wrong frequency set up
The system has detected
that the network frequency
is out of range.
The software transient
network overvoltage
protection has been
triggered.
Manual Power Quality Filter PQFS ç Troubleshooting guide 159
What to do
– 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.
– Verify that the frequency set up at
the commissioning stage
corresponds to the frequency of
the network. (Cf. Chapter
– Reset the system by powering off
and on again.
– Measure the network frequency
and check if it is 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.
If the errors occur sporadically and
the system rides through, nothing
has to be done. If the system does
not ride through (too many transient
errors in a short time):
– Measure the line voltages with a
device capable of measuring the
peak voltage (e.g. scopemeter)
and verify that this value is within
acceptable limits.
– Measure the RMS value of the
network voltage and compare 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.
– Check the earthing of the unit.
8).