Rockwell Automation 6012DB PowerFlex Medium Voltage Variable Frequency Drive - Manual (Page 79)

Rockwell Automation Publication 6000-UM001B-EN-P - October 2014 79
Preventative Maintenance and Component Replacement Chapter 5
Physical Checks (No Medium
Voltage or Control Power) Power Connection Inspection
• Inspect PowerFlex 6000 drive, input/output/bypass sections, and all
associated drive components for loose power cable connections and
ground cable connections: torque them based on the required torque
specifications.
• Inspect the bus bars and check for any signs of overheating / discoloration
and tighten the bus connections to the required torque specifications.
• Clean all cables and bus bars that exhibit dust build-up.
• The torques of incoming / outgoing cable screws of the power unit shall be
check if they are in the specified range.
• Use torque sealer on all connections. Carry out the integrity checks on the
signal ground and safety grounds.
Physical Inspection
• Check for any visual/physical evidence of damage or degradation of
components in the low voltage compartments.
–
This includes Relays, Contactors, Timers, Terminal connectors, Circuit
breakers, Ribbon cables, Control Wires, UPS, AC/DC Power Supplies
etc.; Causes could be corrosion, excessive temperature, or
contamination.
• Check for any visual/physical evidence of damage or degradation of
components in the medium voltage compartments (cables, contactors,
circuit breakers, isolation disconnecting blades, power units, etc.).
–
This includes main cooling fan, power devices, heat sinks, circuit
boards, insulators, cables, capacitors, current transformers, potential
transformers, fuses, wiring, 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.
• 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.
• 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 megger test on the transformer, motor, and
associated cabling.
• Check all bolts for fastening and adjust them as necessary.