8. Outdoor DC Fan Motor control circuit
䋵
䋴
䋳
䋲
䋱
䌒䋷䋵䋲
䌒䋷䋵䋳
䌒䋷䋵䋱
䌕
䌖
䌗
䌑䋷䋱䋵
䌒䋷䋴䋱
䌃䋷䋵䋱
䌃䋷䋵䋲
䌗
䌖
䌕
䌑䋷䋱䋶
䌑䋷䋱䋴
䌑䋷䋱䋲
䌑䋷䋱䋳
䌑䋷䋱䋱
FAN MOTOR
䌃䌎䋲䋴
DRIVE CIRCUIT
MICROCOMPUTER
DIRECT CURRENT Id
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
77
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