Rockwell Automation 7000L PowerFlex 7000 Medium Voltage AC Drive C Frame - Marine - Manual (Page 327)

Component Definition and Maintenance 4-151
7000 ―C‖ Frame - Marine 7000L-UM302B-EN-P – June 2013
• 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.