Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 434)

6-130 Component Definition and Maintenance
7000A-UM150F-EN-P –June 2013 7000 “A” Frame
 Check for any visual/physical evidence of damage and/or degradation
of components in the low voltage compartments.
 This includes Relays, Contactors, Timers, Terminal connectors,
Circuit breakers, Ribbon cables, Control Wires, etc.; 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.
 Check for any visual/physical evidence of damage and/or degradation
of components in the medium voltage compartments (inverter/rectifier,
cabling, DC Link, contactor, load break, harmonic filter, etc).
 This includes main cooling fan, power devices, heatsinks, circuit
boards, insulators, cables, capacitors, resistors, current transformers,
potential transformers, fuses, wiring, etc.; Causes could be corrosion,
excessive temperature, or contamination.
 Verify torque on heatsink bolts (electrical connections to bullet
assemblies) is within specifications (13.5 N-m).
 Clean all contaminated components using a vacuum cleaner (DO
NOT use a blower), and wipe clean components where appropriate.
 NOTE: An important component to check for contamination is the
heatsink. The fine grooves in the aluminum heatsinks can capture
dust and debris.
 Carry out the physical inspection and verification for the proper
operation of the contactor/isolator interlocks, and door interlocks.
 Carry out the physical inspection and verification for the proper
operation of the key interlocks.
 Physical verification of the additional cooling fans mounted in the AC
Line Reactor cabinet, Harmonic Filter cabinet for mounting and
connections.
 Carry out the cleaning of the fans and ensure that the ventilation
passages are not blocked and the impellers are freely rotating without
any obstruction.
 Carry out the insulation meggering of the drive, motor, isolation
transformer/line reactor, and the associated cabling.
 Refer to User‟s Manual, Appendix D for meggering procedure.
Annual Maintenance
(cont.)