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BLOWER FAN CONTROLLER

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2016 – MX-5 – HVAC

BLOWER FAN CONTROLLER

Purpose

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

Functions

  • 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.

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.

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.

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