ABB PQFS Installation, Operation And Maintenance Instructions page 206

Table 62: Other filter indications and behavior with corresponding troubleshooting tips
Symptom
The filter is working at
100% of its nominal
capacity because the
load requirement is
asking this.
The filter is working at
100% of its nominal
capacity while the
load is only at a
fraction of the filter
rating.
206 Troubleshooting guide  Manual Power Quality Filter PQFS
Cause / State
The harmonic stress on
the network is still too
high.
The harmonic stress on
the network is sufficiently
low.
The load requirement is
only a fraction of the filter
size.
There is a problem in the
CT connections or a
hardware problem.
There is a software
problem.
The filter has been asked
to generate static
reactive power.
What to do
Install additional filter units to reduce
the stress further.
The filter can be kept running in this
condition.
−
Check the CT
installation (CT
location, CT shorts, ...)
−
Check the connection
between the CT
terminal block X21 and
the main controller
terminals P5-1...P5-6.
−
Measure the line
currents (e.g. ammeter)
and compare them with
the line currents given
by the filter (PQF-
Manager or PQ-Link).
−
Stop the filter, switch
off the power of the
auxiliaries and switch it
on again. Restart the
filter and see if the
problem is solved.
−
If the problem persists,
contact your ABB
service provider.
Verify the reactive power settings of
the filter.