Rockwell Automation 7000 PowerFlex Medium Voltage AC Drive (B Frame) - Classic Control - Manual (Page 416)

6-126 Component Definition and Maintenance
7000-UM150I-EN-P – June 2013 7000 “B” 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 Manual,
Chapter 6 – Component Definition and Maintenance for a detailed
description of the process.
Preventive Maintenance
Check List