APPENDIX B - VFD INFORMATION (CONT)
48/50PD
Main Fan Replacement
The main cooling fan of the VFD has a life span of about 60,000 operating hours at maximum rated operating temperature and drive load. The expected life span doubles for each 18 F drop in the fan temperature (fan temperature is a function of ambient temperatures and drive loads).
Fan failure can be predicted by the increasing noise from fan bearings and the gradual rise in the heat sink temperature in spite of heat sink cleaning. If the drive is operated in a critical part of a process, fan replacement is recommended once these symptoms start appearing. Replacement fans are available from Carrier.
To replace the main fan for frame sizes R1 through R2, perform the following (see Main Fan Replacement figure):
1.Remove power from drive.
2.Remove drive cover.
3.For frame sizes R1 and R2, press together the retaining clips on the fan cover and lift.
4.Disconnect the fan cable.
5.Install the new fan by reversing Steps 2 to 4.
6.Restore power.
3 
3 4 
2
C08681
Fig. 43 - Main Fan Replacement
(Frame Sizes
Control Panel Cleaning
Use a soft damp cloth to clean the control panel. Avoid harsh cleaners which could scratch the display window.
Battery Replacement
A battery is only used in assistant control panels that have the clock function available and enabled. The battery keeps the clock operating in memory during power interruptions. The expected life for the battery is greater than ten years. To remove the battery, use a coin to rotate the battery holder on the back of the control panel. Replace the battery with type CR2032.
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