M2 MC2125PALS Service Manual - page 43

44

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

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.

Voltage of motor

High

Low

Measure b (F-FAN)

11.1V

10V

Measure C (R-FAN)

10V

10V

Measure d(C-FAN)

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)

Remark

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.