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PWM Controller Fan Motor Hookup

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PWM 60 Amp Cooling Fan Hook up

http://www.autodiagnosticsandpublishing.com/pulse_width_pwm_controller_driver.html

The PWM Bi Directional Controller has two outputs, a high current, and a low voltage trigger. Here, we will show you how to connect, the high current 60 Amp, output to a fan blower motor. The idea is to actuate the motor to prove its operation.

In automobiles today, the cooling fan motor operation can be of two different types. It can be triggered directly, or it can be triggered by a separate module. The PWM Bi Directional controller can do both, control the fan directly, or control trigger the module to prove both.

We start by disconnecting the cooling fan motor.

Here, we can see that this cooling fan motor has 4 wires going to it. Why four wires, when all you basically need are two wires?

The answer is, this motor has the control module built into the radiator fan motor plastic shroud. In this case, the ECM is the one controlling the motor, depending on need. This is a lot more efficient. Why is it more efficient? Simply because the motor does not run all the time, therefore lasting longer. And, the car’s electrical system is not stressed as much.

How is the cooling fan motor then controlled by the ECM? Well, exactly with a PWM duty cycle signal. The same signal produced by the PWM Bi Directional Controller. The controller can do both, the high power 60 Amp output, and the low power trigger control signal. Next, we will show you how to connect the low power control signal. Enjoy...

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