GF07.61-P-3023AMG Fan Control, Function

GF07.61-P-3023AMG Fan Control, Function







The ME-SFI [ME] control unit indirectly actuates the electric suction fan engine and AC continuously.

The fan specified speed is transmitted by the ME-SFI [ME] control unit via a PWM signal (pulse width modulated signal).

The duty cycle of the PWM signal is 10 to 90 %.

Meaning:
10% Electric suction fan "OFF"
20% Electric suction fan "ON", minimum speed
90% Electric suction fan "ON", maximum speed

The AAC [KLA] control unit transmits the status of the automatic air conditioning via the CAN data bus to the ME-SFI [ME] control unit. The fan specified speed is dependent on this and on the coolant temperature.

The engine and AC electric suction fan runs on for up to 5 minutes at "Ignition OFF" if the coolant temperature, the engine oil temperature or the temperature of the ME-SFI [ME] control unit exceeds specified maximum values.

If the battery voltage drops excessively during this operation, engine off running is suppressed.

Fan emergency operation
If actuation is faulty, the engine and AC electric suction fan runs at maximum rpm.