MoTeC Global Forum

Gents anyone set up a PWM water pump control and fan control ? I am using the CWA400 pump and fans from steele with PWM controllers built in. So all i have to do is give a PWM signal from the motec for the pump and fans, just looking for any examples of this if its been done. Also can the PDM be made to keep an output on after ignition off for a period of time as looking to do a pump and fan run on after engine shutdown.

What firmware package are you using? Or are you asking for how to code this in M1 Build?

Have the GPR m150 package, yes looking as how to code this , many thanks for your replies

To Set them up for PWM control, you just navigate to Initial Setup > Engine Outputs.

You need to define the control frequency (if it was a switched output the frequency would be set to 0)



The coolant pump control system features both an after run feature and a hold delay.



The coolant fans are the same deal, define the control frequency and plot you duty cycle target vs temp.

If the pump and fan have built in controllers, the output resource in the M1 should be connected to the control signal wire for the unit. The PDM (if a MoTeC one) should only be used for supplying constant power to the device - it is not capable of PWM output. Your control strategy logic in the PDM should be set to control when you want power to these devices, but they should only operate based on the control signal supplied to the unit.

In the GPR firmware, the control signals for the fans are only set for low side PWM control, so you may require a pullup if the control pin for the fan module is not floating with its own pullup.

The coolant fan control can be a high side PWM signal (only when using a half bridge output resource) meaning you wont require a pullup by entering negative values in the duty cycle table.