174 Rockwell Automation Publication 7000-UM202H-EN-P - November 2023
Appendix A Preventative Maintenance Schedule
• Circuit board part numbers / serial numbers / revision letters (this only
needs to be recorded if parts have been modified or changed since the
last preventive maintenance activities)
Physical Checks (NO Medium Voltage and NO Control Power)
1. 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.
2. Carry out the integrity checks on the signal ground and safety grounds.
3. 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, and so one. 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.
4. 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, and so on. 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 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.
5. 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.
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.
IMPORTANT Do not use a blower.
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