Rockwell Automation 7000A PowerFlex Medium Voltage Drive (A-Frame) - Classic Control - Manual (Page 432)

6-128 Component Definition and Maintenance
7000A-UM150F-EN-P –June 2013 7000 “A” Frame
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.
Operational Maintenance
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‟s Manual,
Chapter 6 – Component Definition and Maintenance for a detailed
description of the process.
Preventive Maintenance
Check List