Rockwell Automation Publication 6000-TG100A-EN-P - September 2020 23
Chapter 2 Preventative Maintenance and Component Replacement
transformers, fuses, wiring, and so on; Causes could be corrosion,
excessive temperature, or contamination.
• Clean all contaminated components using a vacuum cleaner (DO NOT
use a blower), and wipe clean components where appropriate.
• Conduct the physical inspection and verification for the proper
operation of the contactor/isolator interlocks, and door interlocks.
• Conduct the physical inspection and verification for the proper
operation of the key interlocks.
• Conduct the cleaning of the fans and verify that the ventilation passages
are not blocked and the impellers are freely rotating without any
obstruction.
• Conduct the insulation resistance (IR) test on the transformer, motor,
and associated cabling.
• Check all bolts for fastening and adjust them as necessary.
• Check all labels for readability. If any labels are unreadable, damaged, or
missing, contact Rockwell Automation for replacements.
Medium Voltage Testing
Medium voltage insulation resistance (IR) or dielectric withstanding voltage
tests should not be used to check solid-state control equipment. When
performing IR tests on electrical equipment, such as transformers or motors,
solid-state devices must be bypassed before performing the test. Even though
no damage may be readily apparent after an IR test, the solid-state devices are
degraded and repeated application of high voltage can lead to failure.
Maintenance after a Fault Condition
Opening of the short circuit protective device (such as fuses or circuit
breakers) in a properly coordinated motor branch circuit is an indication of a
fault condition in excess of operating overload. Such conditions can cause
damage to medium voltage motor control equipment. Before restoring power,
the fault condition must be corrected and any necessary repairs or
replacements must be made to restore the medium voltage motor control
equipment to good working order. See NEMA Standards Publication No. ICS-
2, Part ICS2-302 for procedures. Use only replacement parts and devices that
are recommended by Rockwell Automation to maintain the integrity of the
equipment. Verify that the parts are properly matched to the model, series, and
revision level of the equipment. After maintenance or repair of the equipment,
always test the control system for proper functioning under controlled
conditions (that avoid hazards in the event of a control malfunction). For
additional information, see NEMA ICS 1.3, PREVENTIVE MAINTENANCE OF
INDUSTRIAL CONTROL AND SYSTEMS EQUIPMENT, published by the
National Electrical Manufacturers Association, and NFPA70B, ELECTRICAL
EQUIPMENT MAINTENANCE, published by the National Fire Protection
Association.
To Next Page
Loading...
Need help?
General
