Originally Posted by Pinnacle Fit
Tbh I have a d5 Vario and it’s really difficult to reach back there and mess with the setting...so I need a way to regulate it without reaching back there.
And I got it set up. It works. I’m Testing now to make sure my house doesn’t burn down.
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That'll probably work out OK.
The D5 has a fairly sizeable electrolytic cap on the power feed, so it's going to integrate the pulses and act more like voltage control electrically than actual PWM, but as long as it works, is what counts.
A number of folks used high power variable voltage fan controllers to vary the speed of the Vario D5 with the red adjuster set at 5, so the interesting thing is going to be to see how much range of control you can effect.
Been a bunch of years, but my best recollection is that you could slow the D5 down to about 7.5V, but it wouldn't start with less than about 9V, and the usable RPM range was somewhat less than you could slow it down to with the red adjuster set at 1 to 2.
I did try a similar idea with a pair of D5 Strongs on a PWM controlled 24v supply, and while the D5S has a top rpm of about 6100 with a 24V supply, I could never get it to run reliably below about 3800-4100 rpm
Keep us posted on what kind of speed range you can get, and what minimum speed setting you can get it to reliably start at on power up.