Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 351)

Component Definition and Maintenance 6-61
7000 “B” Frame 7000-UM150I-EN-P – June 2013
The inlet ring is the large circular part located on the underside of a
horizontal barrier beneath the fan impeller. It is positioned such that
the impeller sits inside but does not touch the ring. The ring sits
inside the impeller 10 mm (0.40 inches).
Safety Notes
This procedure will require coming in contact with the internal
electrical connectors and devices. It is EXTREMELY important
that ALL POWER BE REMOVED FROM THE DRIVE!
Failing to do so may result in serious injury or death.
Precautions must be taken to prevent the inlet ring from falling after
all of the bolts have been removed
Procedure
A T T E N T I O N A T T E N T I O N To prevent electrical shock, ensure the main
power has been disconnected before working
within the DC Link and Fan Area. Verify that
all circuits are voltage free using a hot stick or
appropriate high voltage-measuring device.
Failure to do so may result in injury or death.
NOTE: If rear panel access is possible, remove rear middle panel
of the DC link / fan portion of the cabinet and remove the inlet
ring from the back.
If rear panel access is not possible, follow this procedure:
1. Remove DC Link Barrier and Impeller Access Panel (see Fig.
6.40). Remove electrical components in front of the inlet ring
access panel.
2. Remove bolts from the inlet ring being careful not to allow the
ring to fall.
3. Remove inlet ring via the bottom access panel by moving it
around the DC link and diagonally out the door. Shifting of the
DC link may be required.
4. To install the new ring, reverse the above procedure. Rotate the
fan impeller by hand to ensure that there is no contact with the
inlet ring. Move the ring and retighten bolts to eliminate
interference.
5. Replace access panels and electrical components.
Inlet Ring Removal and
Replacement