Duet Wifi at 15V with 12V Fan and Heater?
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Hello,
i use a Duet Wifi with actually 12V.
But this power source is getting old and I should replace it.Now I have from another hobby an 15V 350W power adapter.
It should be possible to use this Power adapter with my actual setup with 12V Fans and heater
if I change the maximum PWM to 80%.
That should give me the same effective voltage for the heater and the fans.Did somebody try that?
Regards,
Stefan
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It would work fine with heaters, not so sure about the fans as they will still see 15v peaks. It may well work, for a while.
You'd be better off using a dc/dc converter to drop the voltage for the fans.
Edit; I might not bother dropping the duty cycle for the heaters if the wiring and connectors can handle it; just re-tune the heaters for the new voltage. You'll get the same warning about over powered heaters anyway, i.e. it won't be any safer, only slower.
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You will be just fine with the increased voltage and as bearer says, re-tune the heaters. You will however find that you might need to change the duty cycle to 60% as power = current * voltage squared.
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To reduce the fan voltage back to 12V, you could remove the VFAN jumper and replace it with 3 silicon diodes connected in series, between the VIN pin of that jumper block and the centre pin. Keep clear of the 5V pin!
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Ok, thanks for your answers.
I will try that
