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APPENDIX C — VFD INFORMATION (cont)
Table E — Maintenance Intervals
MAIN FAN REPLACEMENT
The main cooling fan of the VFD has a life span of about
60,000 operating hours at maximum rated operating tempera-
ture 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 R4, per-
form the following (see Fig. D):
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. For frame sizes R3 and R4, press in
on the lever located on the left side of the fan mount, and ro-
tate the fan up and out.
4. Disconnect the fan cable.
5. Install the new fan by reversing Steps 2 to 4.
6. Restore power.
To replace the main fan for frame sizes R5 and R6, perform the
following (see Fig. E):
1. Remove power from drive.
2. Remove the screws attaching the fan.
3. Disconnect the fan cable.
4. Install the fan in reverse order.
5. Restore power.
INTERNAL ENCLOSURE FAN REPLACEMENT
The VFD IP 54 / UL Type 12 enclosures have an additional in-
ternal fan to circulate air inside the enclosure.
To replace the internal enclosure fan for frame sizes R1 to R4,
perform the following (see Fig. F):
1. Remove power from drive.
2. Remove the front cover.
3. The housing that holds the fan in place has barbed retaining
clips at each corner. Press all four clips toward the center to
release the barbs.
4. When the clips/barbs are free, pull the housing up to remove
from the drive.
5. Disconnect the fan cable.
6. Install the fan in reverse order, noting the following: the fan
airflow is up (refer to arrow on fan); the fan wire harness is
toward the front; the notched housing barb is located in the
right-rear corner; and the fan cable connects just forward of
the fan at the top of the drive.
To replace the internal enclosure fan for frame sizes R5 or R6,
perform the following:
1. Remove power from drive.
2. Remove the front cover.
3. Lift the fan out and disconnect the cable.
4. Install the fan in reverse order.
5. Restore power.
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 ex-
pected 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.
MAINTENANCE INTERVAL
Heat Sink Temperature
Check and Cleaning
Every 6 to 12 months (depending
on the dustiness of the environment)
Main Cooling Fan
Replacement
Every five years
Internal Enclosure Cooling
Fan Replacement
Every three years
Capacitor Change
(Frame Size R5 and R6)
Every ten years
HVAC Control Panel
Battery Change
Every ten years
Fig. D — Main Fan Replacement
(Frame Sizes R1-R4)
Fig. E — Main Fan Replacement
(Frame Sizes R5 and R6)
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