9-7) Fan Motor(Bldc) Drive Circuit - M2 MC2125PALS Service Manual

Circuit Descriptions
9-7) Fan Motor (BLDC) Drive Circuit
1) Motor drive circuit
1-1) This refrigerator adopts a BLDC motor froeduce energy consumption, Motors of the freezer, refrigerator and the
machine compartment are composed of the BLDC. For RS2533, R-fan is operated by AC 115V Motor.
1-2) Voltages between high-speed and low-speed
Measure b (F-FAN)
High
Low
Note) Under the conditions, the fans will be operated in 2 options, such as High and Low mode. Generally, it is
operated in the High mode during a day time and in the Low mode at night.
1-3) When the motor rpm is in 600�700, it will stop automatically and it tries to resume after 10 seconds. If the motor is
not working properly after 5 time trials, it will rest for 10 minutes, then try to resume again. This process will be
done continuously.
Note) If there is an abnormal situation for the motor, the self-diagnostics will show the corresponding LED segment.
Voltage of motor
Measure C (R-FAN) Measure d(C-FAN)
11.1V 10V 10V
10V 10V 8.3V
In the normal operation, MICOM No. 40, 41 and 42 applies a constant frequency; and
MICOM defects the signal to check the failure of motor.
(frequency(Hz)×12 = motor rpm)
44
Remark