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12. DC Fan Motor Drive Circuit
MODEL RAD-25QH4, RAD-40QH4
¥ Fig. 12-1 shows the indoor DC fan motor drive circuit.
L101
35V
(Terminal board C)
Micro computer
Fan PWM
out put
Fan motor
voltage
feedback
Fan motor
current
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 PWM 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
computer controls the fan PWM output so the output Voltage is set to the specified value. The chopper
frequency of the fan PWM output is 15.7kHz.
¥ The fan current abnormality detector detects the fan motor current using R101-R105 and COM91 determines
an overcurrent and outputs it to fan current abnormality pin
"Lo" when overcurrent occrus.
¥ REG3 supplies 5V DC to the DC fan motor.
ICP2
Q901
Q902
R911
R913
Q903
54
R916
R917
60
C909
5V
0V
R907
3
1
C905 R904
53
2
COM901
L901
R912
D901
R914
R915
5V
0V
Fig. 12-1
which is "Hi" during normal operation and
53
194
RED
6
V
M
5V
YEL
3
C902
BLU
4
CN10
0V
Terminal board D
to control the voltage which
54
M
Indoor DC
fan motor
; the micro
60
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