Rockwell Automation 7000L PowerFlex Medium Voltage AC Drive (C Frame) - Classic Control - Manual (Page 478)

6-134 Component Definition and Maintenance
7000L-UM300I-EN-P – June 2013 7000 “C” Frame
• Maintenance of the Water pumps
– The two water pumps
should be greased and checked for leaks whenever preventive
maintenance is scheduled or every 3 months which ever comes
first.
• Check Coolant Levels in the reservoir
– The level of coolant
should be measured or marked on the side reservoir. Masking
tape placed vertically on the side of the reservoir can be marked
with a pen or pencils for future level references.
The coolant level will go down due to evaporation. Significant
change in coolant levels could be sign of leak in the drive or heat
exchanger and should be checked thoroughly.
Percentage of Glycol in coolant should also be checked
periodically. Since Water will evaporate faster than Glycol, the
percentage could change as the liquid evaporates. The heat
transfer quality changes as the percentages changes. A correct
Glycol content should be maintained to balance the heat transfer
quality and freezing point of the liquid.
• Maintenance of the heat exchanger – The liquid to air
exchangers have fans, chiller fins and tubing. They should be
checked for debris and cleaned periodically. Make sure all
inspection opening cover plates are re installed after inspection.
Annual Maintenance
These maintenance tasks should be performed on an annual basis.
These are recommended tasks, and depending on the installation
conditions and operating conditions, you may find that the interval
can be lengthened. For example, we do not expect that torqued
power connections will require tightening every year. Due to the
critical nature of the applications run on MV drives, the key word is
preventive. Investing approximately 8.0 hours per year on these
tasks is time well spent in adding insurance against unexpected
downtime.
Initial Information Gathering
Some of the important information to be recorded includes:
 Print Drive Setup
 Print Fault/Warning Queues
 Save Parameters to NVRAM
 Save Parameters to Operator Interface
 Circuit Board Part Numbers / Serial Numbers / Revision Letters*
(* This only needs to recorded if parts have been
modified/changed since the last PM activities)
Operational Maintenance
(cont.)