Publication 2100-IN012B-EN-P - April 2005
9-2 Maintenance
NOTE: The factory-made power bus connections are tightened by a
computer-controlled torquing system. The following connections do not
require re-torquing, vertical to horizontal bus connections and power
conductor to horizontal bus connections. These factory-made connections do
not require servicing for the life of the motor control center.
5. Air filters for fans should be periodically cleaned or changed, depending
on the environmental conditions.
6. Check for the proper function and freedom of movement (no sticking
or binding) for the disconnect handle operating and defeater
mechanisms. Replace broken, deformed, malfunctioning or badly worn
parts or assemblies.
7. Inspect unit bus stab connections for wear or corrosion. Wear and/or
corrosion can increase resistance and cause an increased temperature of
the contact point, leading to failure. Replace bus stabs if wear or
corrosion is excessive. Lubricate bus stabs with NO-OX-ID
®
grease
(catalog number 2100H-N18 or 2100H-N18T) before installing the unit
into the section.
8. Inspect current carrying parts such as fuse clips, knife blades of
disconnects and line and load terminals of devices for discoloration,
corrosion or other signs of wear or possible failure.
9. Check locking or interlocking devices for proper working condition.
Adjust, repair or replace any device if necessary.
ATTENTION
Follow NFPA 70E safety guidelines when working on
energized equipment.
To prevent injury or death to personnel lubricating
disconnect switch contacts, make sure the motor control
center power source(s) is disconnected and the respective
disconnect(s) is locked in the OFF/O position. For plug-in
units, remove the unit from the motor control center.
To prevent personal injury or damage to equipment, make
sure that the unit handle operator is in the OFF/O position
before removing the unit.
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