ABB PQFS Installation, Operation And Maintenance Instructions page 209

Symptom
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.
Cause / State
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  Troubleshooting guide 209
What to do
−
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 61
and
information on these
errors and for
guidelines on how to
troubleshoot them.
Table 60
for more