8. Outdoor DC Fan Motor control circuit
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１
Ｒ７５２
Ｒ７５３
Ｒ７５１
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Ｑ７１５
Ｒ７４１
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FANMOTOR
ＣＮ２４
DRIVECIRCUIT
MICROCOMPUTER
DIRECTCURRENTId
The external fan motor is controlled by the outdoor microcomputer.
This outdoor fan motor estimates the actual speed, based on the DC current flowing to R741; it then
adjusts this value as necessary, so that it becomes the speed corresponding to the operation command
transmitted from the indoor unit. In addition, overcurrent detection and other fault detection is
performed, based on the DC current.
Fig. 8-1
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