supply with 30vdc instead of 60vac

Thread Starter

Mullins

Joined Dec 31, 2021
210
Hi, since I don't have 60vac may I supply with 30vdc?
The device have an bridge rectifier immediately after the power.power.jpg
 
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KeithWalker

Joined Jul 10, 2017
3,603
A 60VAC supply would give a DC voltage of >80V after the rectifier. 30VDC applied at that point would not be enough to get the system working properly and would probably damage the equipment.
 

nsaspook

Joined Aug 27, 2009
16,262
I looked better on the manual and I found something... So I gave 28.5vdc and it worked.
It's unlikely to work well at that low DC voltage near expected design loads. The motor controller looks to be current (torque) driven PWM, so that torque will be limited by the low DC power supply voltage and current limits of the motor windings and output drivers.
 
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Thread Starter

Mullins

Joined Dec 31, 2021
210
You'r right but I was looking just for testing without driving any motor. Anyway I read that maybe this board is able to work even with a battery. In the future I'm going to look better about this aspect.
 

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MisterBill2

Joined Jan 23, 2018
27,258
Given that the "60 VAC" feeds into a block that we have no hint about, the very best that can happen is a guess. We see in that box a diode and capacitor. So the output might be 30 volts DC from a center-tapped transformer, or some other voltage, we have no hint.
If this is an assembly that you have, a sanity check could be looking inside at the voltage rating of the various electrolytic capacitors in the power supply sections. AND, understand that the very best you will get from a partial block diagram is good guesses.
 
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