Carrier WEATHERMAKER 48/50AJ User Manual

Page 168

168

APPENDIX C — 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 tempera-

tures 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,

perform 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 rotate 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 internal

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 retain-

ing 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 re-

move 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 as-

sistant 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.

Bottom View (R5)

Bottom View (R6)

Fig. D — Main Fan Replacement

(Frame Sizes R1-R4)

Fig. E — Main Fan Replacement

(Frame Sizes R5 and R6)

A39-2922

A48-7714

A48-7715