126 Rockwell Automation Publication 7000-UM202D-EN-P - May 2018
Chapter 2 Power Component Definition and Maintenance
6. Tighten the cap screws progressively with a wrench. Do this evenly as
though mounting an automobile wheel. Turn one a quarter turn, then
the next a quarter turn, then go back and turn the other a quarter turn
and so on. Torque to 10.2 N•m (7.5 lb•ft).
7. Peen the end of the motor shaft at the keyway with a chisel or center
punch to prevent the key from falling out of position.
Fan Balance
Fan impellers are statically and dynamically balanced within acceptable
tolerances at the factory. Damage in shipping or from poor handling or
installation may upset the fan balance. An impeller that is not properly
balanced can lead to excessive vibration causing undue wear on the entire unit.
If vibration is excessive, shut down the fan and determine the cause.
Some common causes of excessive vibration include:
• support structure not sufficiently rigid or level. Vibration amplified by
resonance in duct work or support structure.
• bearing locking collar or mounting bolts loose. Impeller or bushing
loose.
• material accumulation on impeller.
•wheel rubbing on inlet ring.
The inlet ring is the large circular part located on the underside of a horizontal
barrier beneath the fan impeller. The position enables the impeller to sit inside
without touching the ring. The ring sits inside the impeller 10 mm (0.40
inches).
Safety Notes
This procedure requires contact with the internal electrical connectors and
devices. Disconnect all power to the drive before beginning the work. Failing
to do so may result in serious injury or death.
Ensure you can prevent the inlet ring from falling after you have removed all of
the bolts.
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.
ATTENTION: To prevent electrical shock, disconnect the main power before
working on the drive. Verify that all circuits are voltage-free using a hot stick
or appropriate voltage-measuring device. Failure to do so may result in injury
or death.
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