Carrier 50PD05 Operating And Service Instructions page 90

APPENDIX B - VFD INFORMATION (CONT)
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 2
start appearing. Replacement fans are available from Carrier.
To replace the main fan for frame sizes RI through R2, perform the
following (see Main Fan Replacement figure):
1. Remove power from drive.
2. Remove drive cover.
3. For frame sizes RI 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.
Fig. 43 - Main Fan Replacement
(Frame Sizes R1-R2)
(08681
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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