Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive - Air-Cooled (A Frame) - Manual (Page 298)

5-56
Component Definition and Maintenance
7000A-RM001A-EN-P – January 2011 7000 “A” 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 5. 41 ):
Using an 8 mm (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.