Outdoor Fan Motor Control - Toshiba RAS-25U2FVG-ND Service Manual

Item
3. Outdoor fan The blowing air volume at the outdoor unit side is controlled.
motor control
Receiving the operation command from the controller of
indoor unit, the controller of outdoor unit controls fan speed.
* For the fan motor, a DC motor with non-stage variable
speed system is used. However, it is limited to 8 stages for
reasons of controlling.
Air conditioner ON
(Remote controller)
Indoor unit controller
1) Outdoor unit
operation command
(Outdoor fan control)
2) Fan speed ≥ 400.
when the motor OFF.
(by strong wind)
NO
Fan motor ON
3) Fan lock
NO
4) Motor operates as shown in the table below.
In cooling operation
RAS-25U2AVPG-ND
Compressor speed
RAS-35U2AVPG-ND
Fan speed range
To ≥ 38°C
To ≥ 28°C
To ≥ 15°C
To
To ≥ 5.5°C
To ≥ 0°C
To ≥ 0°C
When To is abnormal
Outdoor fan speed (rpm)
Model name
f0 f1
580
RAS-25U2AVPG-ND 0
600
RAS-35U2AVPG-ND 0
Operation flow and applicable data, etc.
Fan motor OFF continues
YES
(Use wind for heat
YES
Air conditioner
OFF
~ 31.7
Hz < 19.8 34.8 ≤ Hz
19.8 ≤ Hz < 34.8
Hz < 22.8 44.4 ≤ Hz
22.8 ≤ Hz < 44.4
MIN MAX MIN MAX MIN
f6 fB f8 fE fA
f5 fA f7 fE f9
f3 f7 f5 f9 f7
f2 f5 f4 f7 f6
f1 f3 f3 f5 f4
f1 f2 f2 f4 f3
OFF fB OFF fE f1
f2 f3 f4 f5
580 600 600 600
600 600 600 600
exchanging)
Alarm
display
RAS-25U2AVPG-ND
Compressor speed
RAS-35U2AVPG-ND
MAX Fan speed range
fE To ≥ 10°C
fE To ≥ 5°C
fB To To ≥ -3°C
f9 To ≥ -10°C
f7 To < - 10°C
f5 When To is abnormal
fE
Fan speed range
f6 f7 f8 f9
630 640 640
650
600 600 650 700
- 35 -
Description
1) The operation command sent
from the remote controller is
processed by the indoor unit
controller and transferred to the
controller of the outdoor unit.
2) When strong wind blows at
outdoor side, the operation of air
conditioner continues with the
fan motor stopped.
3) Whether the fan is locked or not
is detected, and the operation of
air conditioner stops and an
alarm is displayed if the fan is
locked.
4) According to each operation
mode, by the conditions of
outdoor temperature (To) and
compressor revolution, the speed
of the outdoor fan shown in the
table is selected.
In heating operation
Hz < 19.8 19.8 ≤ Hz < 51.6
Hz < 22.8 22.8 ≤ Hz < 48.6
MIN MAX MIN MAX
f7 f8
f9 fB
fE fE
fE fE
fE fE
fE fF
fA fB fC fD fE
650 680 700 700 700
700 700 700
700 700
51.6 ≤ Hz
48.6 ≤ Hz
MIN MAX
f9
fE
fE
fE
fE
fF
fF
750
850