ABB PQFM Instruction Manual page 215

Fault message Cause
Mismatch In a multi-unit filter,
between units incompatible units or
incompatible unit settings are
used.
No The system cannot
synchronization 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
Out of mains The system has detected that
freq. Limit
the network frequency is out
of range.
Overvolt. The software transient
Transient (SW)
network overvoltage
protection has been triggered.
What to do
- Ensure that all filters have a compatible
setting.
- Recommission the units.
- 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 8).
- 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 PQ-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.
Manual Power Quality Filter PQFM ç Troubleshooting guide 215