PWM Fan

[45Dougal]

Okay, got the fan more or less mounted to the shroud and the radiator after a lot of trimming it's in the M37. It's hook up to the battery through a 100amp bussman resettable breaker. I have the terminator set to 50% duty cycle. My bench said 20% is max, so 50% is not full power. Is shows the soft start and ramp up of the PWM fan. I turned off the key because it was blowing so hard I wasn't sure I had everything secure enough to survive it. I'll get some smoke and do a video of it running

20% duty cycle means 20% on, and 80% off.
Sounds like the input signal is "active low", so when you applied 20% control duty cycle, the fan itself was set to 80% duty cycle.
Be wary that inverting your input signal polarity reverses the fan set points.

 

[workingdog]

Ya, it might be that the cheap pulse generator I have and the Terminator are inverted, I'll figure it out by making a ramp and seeing what it does.

 

[workingdog]

Okay, I wanted to up this. this fan is amazing. I went out for a test drive yesterday and forgot to close the fan breaker and it heated up to 230 before I got to a light and closed the breaker. It took a second, but that fan sounded like a jet engine and immediately brought the temps down. The best part is that as the temps dropped into the 220's (which was less than a minute), the fan was already slowing down. By the time the temps got below 220, which was only another minute or two, you couldn't even hear the fan anymore. It was down and steady at 202 in less than 3 or 4 minutes.

 

[cruisermatt]

The PWM brushless tech is awesome, it's what's on all the new cars these days.

 

[peesalot]

I would bet that less than 1% of fj40 owners could care less about setting up a baisc output table in Holley software.