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; Step 8: Restart The Filter - ABB PQFS Installation, Operation And Maintenance Instructions

10.3.5

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

10.3.6

Step 6: Check the tightness of the electrical and mechanical connections

10.3.7

Step 7: Correct any abnormal conditions found

If required, refer to
10.3.8

Step 8: Restart the filter

10.4 Fan replacement

The cooling fan lifespan is between 4 and 6 years typically, depending on the usage and
ambient temperature. Check the actual fan operating hours with the PQF-Manager
([/Welcome/PQF monitoring/Fan operation]).
Fan failure is often preceded by increasing noise from the bearings and rise of the
heatsink temperature despite cleaning. It is recommended to replace the fan once these
symptoms appear. Contact your ABB service provider for replacement fans for your
system.
In order to exchange the main IGBT cooling fan, follow the instructions below (Cf.
89):
· Ensure that the control cards are free of dust. If necessary remove dust from
them with a soft brush
· Ensure that the main contactor can move freely
· 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
· 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
Chapter 11
· Reclose the auxiliary circuit fuse box
· Refit the filter protective cover and reconnect the PQF-Manager if necessary
· Reapply power to the filter upstream. Verify that the fan starts running and that
the PQF-Manager is booting.
· Restart the filter. If major servicing work has been done it is recommended to
follow the commissioning instructions (cf.
· Verify the filter performance
· Ensure that the power to the filter is switched off (upstream)
· Wait at least 25 minutes to allow for the DC capacitors to discharge
· Open the filter front and disconnect the fan terminals (at the bottom of the filter
next to the IGBT bridge)
· Remove the 4 screws that fix the fan set to the filter enclosure (bottom left side of
the filter)
· Remove the fan assembly from the enclosure
· Remove the fans from their holder and replace by new ones
· Refit the assembly in the unit. Ensure proper fixation by the screws
Section 6.7
for advice on troubleshooting the filter.
Chapter
Manual Power Quality Filter PQFS ç Maintenance instructions 143
and in Chapter 12.
12) for restarting the filter.
Figure