Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 352)

6-62 Component Definition and Maintenance
7000-UM150I-EN-P – June 2013 7000 “B” Frame
Replacement of Air Filters
Air filters are located at the cooling air intake grille mounted on the
door in front of the converter, line reactor and transformer cabinets.
It is necessary to periodically remove and clean, or remove and
replace the filter material. The frequency with which the filters are
renewed depends on the cleanliness of the supplied cooling air.
It is possible to renew the filters while the drive is running, but the
procedure is easier to perform while the drive is shut down.
Procedure
(see Figure 6.45):
– Using a 5/16” Hex key, loosen the ¼ turn fasteners and swing
open the hinged grill assembly.
–
Remove filter material.
Note that if the drive is running, the filter must be replaced as soon
as possible so that foreign material is not drawn into the drive.
Care must be taken in removing the filter, to prevent dirt that has
accumulated on the inlet side of the filter from being sucked into the
drive. It may be difficult to remove the filter material without tearing
it due to the suction at the air inlet.
Recommended cleaning method of filters:
1. Vacuum Clean – A few passes of a vacuum cleaner on the inlet
side of the filter will remove accumulated dust and dirt in
seconds.
2. Blow with Compressed Air – point compressed air nozzle in
opposite direction of operating air flow (Blow from exhaust side
toward intake side)
3. Cold Water Rinse – Under normal conditions the foam media
used in the filters, require no oily adhesives. Collected dirt is
washed away quickly and easily using just a standard hose
nozzle with plain water. (Ensure filter is completely dry
before reinstalling)
4. Immersion in Warm Soapy Water – Where stubborn air-borne
dirt is present, the filter may be dipped in a solution of warm
water and mild detergent. Then simply rinse in clear clean water,
let stand until completely dry and free of moisture, and
return to service.