Table of Contents
Advertisement
04-10
3) PWM Electric Fan
(1) Advantages and Disadvantages of the PWM Electric Fan
4) PWM (Pulse Width Modulation) Unit
▶
Advantages
-
Enhanced A/C performance: at low speed,
at idling, driving in city
-
Reduction of vibration/noise: fan activated
by PWM only when necessary
-
Reduction of engine consuming power
(V/Fan driving force) by 4 Hp - Cost
saving
▶
Disadvantage
-
Poor engine cooling perfomance at low
and high rpm
It controls the time of the output voltage to
control the fan motor speed independently.
▶
Internal functions
-
Motor power shutting-off
overcurrent is applied
-
Adverse voltage prevention function
-
Detection function for the motor lock
-
Temperature
detecting
electric fan operates at FULL speed to
cool down the PWM unit when the interior
temperature
of
120~150°C.
-
Communication function when failing: The
fail signal is transmitted to the ECU when
the PWM unit is malfunctioning.
-
Soft start function: The motor speed is
gradually increased when the motor is
initially operated.
function when
function:
The
PWM unit
is
over
Advertisement
Table of Contents
Troubleshooting
