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4-34
Component Definition and Maintenance
Impeller Maintenance
Inlet Ring Removal and
Replacement
7000A-UM151E-EN-P - October 2018
Isolation Transformer Cooling Fan
The isolation transformer fan motor and impeller is an integral unit and
cannot be serviced separately.
The inlet ring is the large circular part located beneath the fan impeller.
It is positioned such that the impeller sits outside but does not touch the
ring. The ring sits inside the impeller 10 mm (0.40 inches). Refer to the
cutaway view of fan impeller and bushing (Figure 4.23).
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.
To prevent electrical shock, ensure the main
A T T E N T I O N
A T T E N T I O N
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.
DC Link / Fan Section
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.
Procedure
If rear panel access is not possible, follow this procedure:
1. Remove bolts and swingout low voltage panel (see Fig. 4.16).
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.
7000 "A" Frame
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