Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 477)

Component Definition and Maintenance 6-133
7000 “C” Frame 7000L-UM300I-EN-P – June 2013
The preventive maintenance activities on the PF7000 Liquid-Cooled
Drive (C-Frame) can be broken down into two categories:
• Operational Maintenance – can be completed while the drive is
running. These checks should be periodically depending on
operating condition, the time between maintenance should not
exceed three months.
• 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
The PF7000 “C” frame drive uses a mixture of de-ionized water and
Glycol to cool down the devices. One of the desired qualities of this
mixture is the low conductivity; a second is the low freezing point.
The latter is required in climates where the temperature can drop
below 0°C. The maintenance on the system can be done with the
drive running by closing valve # V8 and V9. They must be re-
opened when the changes are done.
The cooling system maintenance includes the following tasks:
• Changing the DI Cartridge – The DI cartridge keeps the
conductivity low by removing positive ions from the DI
water/glycol solution. It needs to be changed whenever the
conductivity warning appears. This occurs when the conductivity
increase above 1µS. The DI cartridge cannot be cleaned it must
be replaced.
• Changing or Cleaning the Mesh Filters – The DI Cartridge
require clean DI water/Glycol solution to prevent damage. There
are two Mesh filters, one before and one after the DI Cartridge.
These should be changed or cleaned whenever they become dirty
or the DI Cartridge is changed. The loose particles on the outside
Mesh Filter can be removed by opening the tap on the bottom of
the clear plastic container. The loose particle and the liquid
should be collected in a small container and then discarded. The
filter can then be removed and cleaned or changed. When the
Mesh Filters are cleaned/changed, they should be thoroughly
checked for damage before they are re-installed.
Preventive Maintenance
Check List