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Rockwell Automation Publication 6000-UM002G-EN-P - August 2022
Chapter 5 Preventative Maintenance and Component Replacement
Fan Balance
Fan impellers are statically and dynamically balanced within acceptable
tolerances at the factory. Damage in shipping or from incorrect handling or
installation may upset the balance. An improperly balanced impeller can lead
to excessive vibration causing undue wear on the entire unit.
If vibration is excessive, shut down the fan and determine the cause. Common
causes of excessive vibration include:
•
Drive support structure not sufficiently rigid or level
•
Loose mounting bolts
•
Loose impeller or bushing
Inspect Isolation Transformer
1. Verify that the fan is rotating in the proper direction.
2. Verify the incoming and outgoing power cable connections are torqued
to specifications.
See
Torque Requirements on page 135
.
3. Check the cabinet interior and Isolation Transformer windings and
remove any foreign material. Vacuum dust or debris from the Isolation
Transformer cabinet.
4. Check for any physical evidence of damage or degradation of
components.
Inspect Voltage Sensing Board
The input VSB cable connections and output VSB wire connectors must be
firmly fastened and show no signs of damage or accumulation of dirt, dust, or
debris.
Replace Voltage Sensing Board
For A-Frame Drives
1. Open the front door of the Junction cabinet.
ATTENTION:
To prevent electrical shock, disconnect the main power before
working on the Voltage Sensing Board. 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.
