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 PQFS Installation, Operation And Maintenance Instructions

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Open the auxiliary circuit fuse box.
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Ensure that the DC capacitors have completely discharged before going to
step 4.

10.3.4 Step 4: Inspect and clean the filter

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Inspect the filter visually for any condition that could indicate an abnormal filter
stress (e.g. abnormal appearance/colour of components and wires).
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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.
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Ensure that no loose particles are left in the fan that could obstruct their free
rotation.
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Ensure that the control cards are free of dust. If necessary remove dust from them
with a soft brush.

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

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Ensure that the main contactor can move freely.
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If bad fuses are found (upstream or in the unit), 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
10.3.6 Step 6: Check the tightness of the electrical and mechanical
connections
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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.
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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

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Reclose the auxiliary circuit fuse box.
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Refit the filter protective cover and reconnect the PQF-Manager if necessary.
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Reapply power to the filter upstream. Verify that the PQF-Manager is booting.
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Restart the filter, verify that the fan starts running. If major servicing work has been
done it is recommended to follow the commissioning instructions (cf.
for restarting the filter.
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Verify the filter performance.
178 Maintenance instructions  Manual Power Quality Filter PQFS
Section
Chapter 11 for advice on troubleshooting the filter.
6.7, Table 22.
Chapter 8)