Fan Replacement - ABB PQFS Installation, Operation And Maintenance Instructions

10.4 Fan replacement

There are different types of fans present in your PQFS unit, depending on the filter
rating. The cooling fan lifespan is between 3 and 6 years typically, depending on the
usage and ambient temperature. Check the actual fan operating hours with the PQF-
Manager ([/Welcome/PQF monitoring/PQF 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 cooling fans, follow the instructions below (Cf.
−
Ensure that the power to the filter is switched off (upstream).
−
Wait for at least 25 minutes to allow for the DC capacitors to discharge.
−
Remove the cover on the right hand side of the filter and disconnect the fan
terminals (at the bottom of the filter next to the IGBT bridge for the "fan in" and on
the top right of the PCB for the "fan out").
−
Remove the screws that fix the fan set to the filter enclosure (4 screws on the
bottom left side of the filter for the "fan in" and 8 screws on the top right side for
the "fan out").
−
Remove the fan assembly from the enclosure.
−
Refit the assembly in the unit. Ensure proper fixation by the screws.
−
Reconnect the fan wires to the terminal block.
−
Reclose the filter cover.
The components description is given in
3
Figure 85: Overview of cooling fan in
3
Figure 86: Overview of cooling fan out
Table 56.
Manual Power Quality Filter PQFS  Maintenance instructions 179
Figure 85):
1
2
1
2