Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 418)

6-128 Component Definition and Maintenance
7000-UM150I-EN-P – June 2013 7000 “B” 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 that 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 Manual, Appendix D – Meggering, for meggering
procedure.
 Check clamp head indicator washers for proper clamp pressure,
and adjust as necessary.
 Refer to User Manual, Chapter 6 – Component Definition
and Maintenance for details on proper clamp pressure.
Annual Maintenance
(cont.)