1 Publication 2100-IN012B-EN-P—April 2005
Chapter
9
Maintenance
A periodic maintenance program should be established for motor control
centers to avoid unnecessary downtime. The frequency of service to MCCs
will depend upon the equipment usage and the environment in which it
operates. The following is a suggested checklist and can be used to establish a
maintenance program.
Maintenance Checklist
1. Inspect the motor control centers once per year or per established
maintenance program.
2. Carefully inspect doors and enclosure sides for evidence of excessive
heat.
3. Condensation in conduit or dripping from an outside source is a
common cause of motor control center failure. Check for moisture or
any signs of dampness or drippings inside the motor control center.
Eliminate any source of moisture. Seal off conduit, cracks and openings
that have allowed and/or could allow moisture to enter the MCC
enclosure. Dry or replace and clean insulating material that is damp or
wet or shows signs of moisture. Check devices such as contactors,
circuit breakers, disconnect switches, relays, pushbuttons, etc., for
wetness or signs of moisture, corrosion or contamination. Replace
damaged or malfunctioning parts. Make sure the source or cause of
wetness or moisture contamination is identified and eliminated.
4. Check the integrity of bus splice connections. Bus splices can be easily
identified by the label located on the interior of the vertical wireway
door or on the interior right hand side plate of frame mounted units.
Recommended torque values can be found on the information label
located on the interior of the vertical wireway door or on the interior
right-hand side plate of frame mounted units.
ATTENTION
De-energize motor control center before servicing.
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