222 Troubleshooting guide
Manual Power Quality Filter PQFM
Symptom
Cause / State
What to do
The THDV increases
when the filter is
running.
The background
distortion is in antiphase
with the load distortion.
Check the background distortion.
The filter is in an incorrect
state.
Stop the filter and reset it by
switching off and on the power.
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.