BLOWER FAN CONTROLLER

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Purpose

• The blower fan controller controls the blower motor rotation speed.

Function

• By placing the fin in the upper part of the blower fan controller, temperature increase in the internal circuit is suppressed.

• The blower fan controller is equipped with a fail-safe function for the purpose of protecting the internal circuits.

Construction

• The blower fan controller is located on the A/C unit.

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Power MOS FET circuit

• When voltage of the threshold or more is applied to the gate, a large amount of electricity flows between the drain and source and the power MOS FET turns on.

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Operation

• For the blower fan controller operation, refer to the [BLOWER SYSTEM]. (See BLOWER SYSTEM.)

Fail-safe

• The blower fan controller stops output for a certain period of time when the following conditions are met.

― Motor lock

• The blower motor locks and over-current flows.

― Abnormal temperature

• The power MOS FET increases temperature abnormally due to half-lock (over-current of a level such that motor-lock is not detected) of the blower motor.