Rockwell Automation 2500 CENTERLINE Motor Control Centers Installation Manual - Manual (Page 74)

74 Rockwell Automation Publication 2500-IN001C-EN-P - April 2014
Chapter 8 Maintenance
Suggested Maintenance
Guidelines This table provides some suggested guidelines for maintaining your MCC.
Suggested Maintenance Guidelines Date Remarks Initials
1. Environment • Verify operating (ambient) conditions.
– Room temperature range: -5…40 °C
(1)
– Non-condensing humidity, max: 95% at 40 °C
(1)
2. Enclosure Exterior • Clean surfaces. Retouch painted surfaces if necessary.
• Check that door latches are functioning and secure.
• Inspect for signs of excessive heat in the following locations:
– Doors
– Enclosure sides
If severe corrosion or discoloration is evident, replace the
damaged components. Identify the cause of damage and
make necessary repairs.
3. Contaminants ATTENTION: Follow local codes and guidelines
in addition to the requirements of EN 50110
when working on energized equipment.
• Check for contaminants (moisture, dirt, dust) inside the
enclosure. Contaminants must be removed and the source
eliminated.
• Check for contaminants in the following locations:
– Cable entry and exit points, seams and openings
– Devices (push buttons, relays, and disconnect switches)
Make sure the source or cause of wetness or moisture is
identified and eliminated.
4. Bus System ATTENTION: De-energize all power sources
before performing maintenance or service
work on columns or units.
• Check the bus support and insulation for cracks and/or
damage.
• Inspect bus splice connections for discoloration.
• Verify the integrity of bus splice connections. Re-torque
connections. See label inside vertical wireway door for
recommended torque values.
• Use a vacuum or a lint free cloth to clean the bus and
supports.
• Conduct an electrical insulation resistance (megger) test.
Record and save the results.
See
Pre-commissioning Checklist on page 67 .
5. Operating Handles • Verify that operator handles move freely (no sticking or
binding).
• Check functions of the operator handles.
• Check the defeater mechanisms on operator handles.
• Replace broken, deformed, malfunctioning or badly worn
parts/assemblies.
6. Locking Devices Check locking and interlocking devices for proper working
condition. Replace as necessary.
7. Current Carrying
Components
• Inspect for discoloration, corrosion, wear, excessive heat
and other signs of possible failure.
• Current carrying devices can include fuse clips, line, and
load terminals.
8. Contacts • Check for excessive wear and dirt accumulation.
– Vacuum or wipe contacts with a soft cloth to remove dirt.
Note: Applicable only for Allen-Bradley® 100-D size
contactors (95-860A).
• Replace contacts in complete sets to avoid misalignment
and uneven contact pressure.
• Discoloration and/or slight pitting of the contacts is normal.
• Do not file contacts or use spray cleaners.