ABB PQFS Installation, Operation And Maintenance Instructions page 165

Symptom
The filter is running with
low load indication and the
load harmonics are not
filtered.
When selecting a
harmonic, the filter
attempts to identify it but
after a while it is put in
standby. The letter 'S'
appears in the harmonics
selection list. The
harmonic is not filtered.
The ' ACK. FAULT'-
message is present on the
PQF-Manager. The alarm
contact switches on after
some delay.
Remark:
If the problems persist, 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 / State
The harmonics are not
selected, the curve setting is
very high or the harmonics
are put in standby by the
system.
The line currents measured
by the filter via the CTs are
lower than the real load
currents.
The filter is in standby-mode,
the IGBTs are not switching.
The filter (CTs) is/are not
installed in a central position
and therefore the filter does
not eliminate the harmonics
of all the loads.
The network conditions do
not allow for the harmonic to
be filtered at present or there
is a CT-problem.
The filter has stopped due to
an error.
Manual Power Quality Filter PQFS ç Troubleshooting guide 165
What to do
(Re)select the harmonics, check the
curve levels and ensure that the correct
settings are active (Main/Auxiliary)
– Check the CT cabling for
problems (CT-installation, CT-
shorts, ...)
– Check the CT settings set up in
the PQF-Manager
Check the standby mode settings to
ensure that they represent realistic
values.
Check that the CTs are installed at the
desired location.
– Check the CT-setup.
– Reselect the harmonic to see if
the problem persists.
– Leave the harmonic in standby.
The filter will automatically restart
identifying/filtering it when another
harmonic component is
successfully (re)identified.
– Acknowledge the fault to see a list
of most recent critical errors.
– Look in the filter event log for
more information on which errors
have occurred.
– Refer to the
Table 57
58 for more information on these
errors and for guidelines on how
to troubleshoot them.
and Table