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Preventive Maintenance
Check List
Operational Maintenance
7000 "A" Frame
Preventative Maintenance Schedule
The preventive maintenance activities on the PF7000 Air-Cooled Drive
("A" Frame or "B" Frame) can be broken down into two categories:
•
Operational Maintenance – can be completed while the drive is
running.
•
Annual Maintenance – should be completed during scheduled
downtime.
Refer to the Tools/Parts/Information Requirements at the end of this
section for a list of documentation and materials needed to properly
complete the preventive maintenance documents.
This process really involves only one task: Changing or Cleaning the
Air Filters. The PF7000 drives require consistent, unrestricted airflow
to keep the power devices cool. The air filter is the main source of
blockage in the air path.
The drive will provide an air filter alarm whenever the pressure
differential across the devices drops to a drive-specific level. Referring
to the Air Filter Block parameter, this can be anywhere from 7% to 17%
blocked, depending on the heatsink and device configuration. This may
seem like a small number, but it takes significant blockage to begin to
lower the voltage from the pressure sensor. The percentage is a measure
of voltage drop, and should not be viewed as a percentage of the
opening that is covered. They are not related linearly.
Once you receive an Air Filter Warning, you should immediately
make plans to change or clean the filter. You should still have days
or weeks until the drive reaches an Air Filter Fault, but this is
dependent on site-specific particle conditions.
This can be done while the drive is running. Refer to User Manual,
Chapter 4 – Component Definition and Maintenance for a detailed
description of the process.
E
Appendix
7000A-UM151E-EN-P - October 2018
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