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2. DC Fan Motor Drive Circuit
ODEL RAD-25NH5, RAD-35NH5, RAK-18NH5, RAK-25NH5, RAK-35NH5, RAK-50NH5, RAI-25NH5, RAI-35NH5, RAI-50NH5
¥ Fig. 12-1 shows the indoor DC fan motor drive circuit.
L101
ICP2
35V
(Terminal board C)
Micro computer
C916
24
Fan PWM
R916
out put
Fan motor
63
voltage
feedback
Fan motor
current
56
abnormal
detection
¥ The circuit produces the fan motor drive voltages, 8-33V, from 35V DC supplied from the outdoor unit and
controls the fan motor speed.
¥ Q901 is switched on and off according to the signal at fan PW output pin
is smoothed by C901, L901 to drive the fan motor.
¥ The output voltage is divided by R918, R919 and R920 and is input to divided voltage output pin ; the micro
computer controls the fan PW output so the output Voltage is set to the specified value. The chopper
frequency of the fan PW output is 15.7kHz.
¥ The fan current abnormality detector detects the fan motor current using R113 and CO 91 determines
an overcurrent and outputs it to fan current abnormality pin
"Lo" when overcurrent occrus.
¥ REG2 supplies 5V DC to the DC fan motor.
All manuals and user guides at all-guides.com
L901
Q901
R912
Q902
D901
R911
R913
R914
R915
Q903
R917
C909
5V
5V
0V
5V
R907
3
C905 R904
1
2
CO 901
0V
Fig. 12-1
- 270 -
RED
4
V
5V
YEL
1
C132
BLU
2
CN10
0V
R113
Terminal board D
to control the voltage which
24
which is "Hi" during normal operation and
56
Indoor DC
fan motor
63
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