Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C-Frame) - ForGe Control - Manual (Page 406)

406 Rockwell Automation Publication 7000L-UM301D-EN-P - June 2014
Chapter 5 Component Definition and Maintenance
• Save Parameters to Operator Interface
• Circuit Board Part Numbers / Serial Numbers / Revision Letters
(1)
Physical Checks (NO Medium Voltage and NO Control Power)
• Power Connection Inspection
– Inspect PowerFlex 7000 drive, input/output/bypass contactor sections,
and all associated drive components for loose power cable connections
and ground cable connections: torque them to 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.
– Use torque sealer on all connections.
• Carry out the integrity checks on the signal ground and safety
grounds.
• 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.
(1) This only needs to recorded if parts have been modified/changed since the last PM activities.
WARNING: To prevent electrical shock, ensure the main power has
been disconnected before working on the drive. Verify that all circuits
are voltage free using a hot stick or appropriate voltage-measuring
device. Failure to do so may result in injury or death.
TIP An important component to check for contamination is the heatsink.
The fine grooves in the aluminum heatsinks can capture dust and
debris.