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1-11. Fan motor driving circuit (freezer, mechanical area)
1. The circuit cuts all power to the fan drive IC, resulting in a standby mode.
2. This circuit changes the speed of the fan motor by varying the DC voltage between 7.5 Vdc and 16 Vdc.
3. This circuit stops the fan motor by cutting off power to the fan when it senses a lock-up condition.
(1) GR-P227/L227/P257/L257
EXPLATION FOR MICOM CIRCUIT
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a , d part b part e part
Motor OFF 5V 2V or less 2V or less
Motor ON 2 ~ 3V 12 ~ 14V 8 ~ 16V
b
a
d
e