Rockwell Automation Publication 2100-IN012G-EN-P - August 2016 99
Chapter 9
Maintenance
Establish a periodic maintenance program for MCCs to avoid unnecessary
downtime. The frequency of service to the MCC depends on the equipment
usage and the operating environment. The following is a suggested checklist
and can be used to establish a maintenance program.
Maintain the MCC
To maintain your MCC, follow these steps.
1. Inspect the MCCs once per year or per established maintenance
program.
2. Carefully inspect doors and enclosure sides for evidence of excessive
heat.
3. Check for moisture or any signs of dampness or drippings inside the
MCC.
a. Seal off conduit, cracks, and openings that have let and/or could let
moisture enter the MCC enclosure.
b. Dry or replace and clean insulating material that is damp or wet or
shows signs of moisture.
c. Check devices such as contactors, circuit breakers, disconnect
switches, relays, and push buttons for wetness or signs of moisture,
corrosion, or contamination.
d. Replace damaged or malfunctioning parts.
4. Check the integrity of bus splice connections.
Bus splices can be easily identified by the label 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 on the interior of the vertical wireway door or on the
interior right-hand side plate of frame mounted units.
ATTENTION: De-energize the MCC before servicing.
IMPORTANT Condensation in conduit or dripping from an outside source is a common
cause of MCC failure. Eliminate any source of moisture.
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