Rockwell Automation 7000A PowerFlex Medium Voltage AC Drive (A Frame) - ForGe Control - Manual (Page 176)

176 Rockwell Automation Publication 7000A-UM200C-EN-P - June 2014
Appendix C Preventative Maintenance Schedule
High Voltage Testing
High voltage insulation resistance (IR) or dielectric withstanding voltage
(megger) tests should not be used to check solid-state control equipment. When
meggering 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 a megger 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. Refer to NEMA Standards Publication No. ICS-2, Part ICS2-302 for
procedures. Use only replacement parts and devices recommended by Allen-
Bradley to maintain the integrity of the equipment. Ensure 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, refer to 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.
Part-specific Notes Cooling Fans
Inspect fans used for forced air cooling. Replace any that have bent, chipped, or
missing blades, or if the shaft does not turn freely. Apply power momentarily to
check operation. If unit does not operate, check and replace wiring, fuse, or fan
motor as appropriate. Clean or change air filters as recommended in the Users
Manual.