Rockwell Automation 2500 CENTERLINE Motor Control Centers Installation Manual - Manual (Page 75)

Rockwell Automation Publication 2500-IN001C-EN-P - April 2014 75
Maintenance Chapter 8
9. Coils • Check contactor and relay coils for signs of overheating
(cracking, melting or burnt insulation).
– If signs of overheating are present, replace the coil.
• Correct the overvoltage or undervoltage conditions that
caused coil failure.
• Clean any residue of melted coil insulation from other parts
of the device or replace such parts.
10.Terminals • Check for loose wire connections and tighten as necessary.
• Check schematics/component documentation for torque
values.
– Power terminals
– Control circuit terminals
• Replace damaged parts or wiring.
11.Pilot Lights Replace damaged lamps and lenses.
12.Fuses • Check fuses and fuse clips.
– When replacing fuses, install the same type and rated
fuse that was originally furnished with the MCC.
13.Fans and Cooling
Devices
• Inspect blowers and fans for operation and damage.
– Replace blowers and fans that have bent, chipped or
missing blades, or if the shaft does not turn freely.
• Clean or change air filters for fans.
• Clean heat exchanger fins.
14.Solid State Devices • Perform a visual inspection. Components or circuit boards
must be replaced if the following are found:
– Discoloration
– Charred or burned components
• Check printed circuit boards for:
– Proper seating in the edge board connectors
– Locking tabs in place
15.Unit Stabs • Inspect stabs for wear and/or corrosion. Replace if necessary.
– If the line stab assembly is severely pitted, inspect the
vertical bus for wear and pitting. Replace as necessary.
• Lightly lubricate line and load stabs with NO-OX-ID grease
before installing the unit into the column.
16.Control and
Network Plugs
• Inspect for bent or damaged pins.
– If necessary, clean the contacts.
• Verify the connector mechanism is functioning properly.
17.Withdrawable Units • Remove dust and grease from the guide rail.
• Check that the withdraw lever and locking mechanism
operate freely.
• Check for easy movement of withdrawable units within the
column.
• Test the unit interlock function.
18.Final Check • Verify all withdrawable units are in the correct operating
position (Connected, Test, Disconnected, Withdrawn).
• Verify enclosure doors and wireway covers have been closed
and are secure.
• After performing maintenance or repair, test the control
system for proper functioning under controlled conditions.
(1) The average temperature over a 24-hour period must not exceed 35 °C.
Suggested Maintenance Guidelines Date Remarks Initials