Step 4: Inspect And Clean The Filter; Step 5: Check The Condition Of The Filter Contactors And Fuses; Step 6: Check The Tightness Of The Electrical And Mechanical Connections; Step 7: Correct Any Abnormal Conditions Found - ABB PQFM Instruction Manual

- Ensure that the DC capacitors have completely discharged before going to
step 4.

10.3.4 Step 4: Inspect and clean the filter

- Inspect the filter visually for any condition that could indicate an abnormal filter
stress (e.g. bulbs not on if they have to be, abnormal noises, abnormal
appearance/colour of components and wires).
- Remove all dust deposits in and around the filter. Pay special attention to the fan
and the heatsink. Indeed, the heatsink picks up dust from the cooling air and the
PQF might run into overtemperature faults if the heatsink is not cleaned regularly.
Pay special attention to this item if the filter has experienced shut downs due to
over temperature in the past.
- Ensure that no loose particles are left in the fan that could obstruct their free
rotation.
- Ensure that the control cards are free of dust. If necessary remove dust from them
with a soft brush or vacuum cleaner.

10.3.5 Step 5: Check the condition of the filter contactors and fuses

- Ensure that the main contactor is ok and that the contactors can move freely.
- If bad fuses are found, replace them. If the fuse in one phase is bad, it is good
practice to change the fuses of all phases. More information on the fuses to use is
given in Section
10.3.6 Step 6: Check the tightness of the electrical and mechanical
connections
- Ensure that all electrical connections are properly fixed and that connectors are
properly plugged in. Remove oxidation traces of pin connectors if present. To this
effect a small stiff brush can be used.
- Check the mechanical fixation of all components and retighten if necessary

10.3.7 Step 7: Correct any abnormal conditions found

If required, refer to

10.3.8 Step 8: Restart the filter

- Reapply power to the filter and close the auxiliary circuit fuse box. Verify that the
fan starts running and the control board and the PQF-Manager are activated.
- Restart the filter. If major servicing work has been done it is recommended to follow
the commissioning instructions (cf.
Verify the filter performance.
-
196 Maintenance instructions ç Manual Power Quality Filter PQFM
6.7, Table 22.
Chapter 11 for advice on troubleshooting the filter.
Chapter 8) for restarting the filter.