Back EMF protection

[Siegmeyer]

I have a 48v, 12.5a dc supply powering a mx3660 stepper motor driver. The hardware manual for the stepper driver says to add a capacitor between the power supply and stepper driver to protect against back EMF. I have heard of people blowing out their drivers when engaging the emergency stop switch while their motors are running so I figured it would be good to follow the instructions.

Technical support from the leadshine said to use a 63v, 2200uF capacitor.
Will this really help?

Thanks!




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[Jim Dawson]

It can't hurt. It would give the power someplace to go in the event of an emergency shutdown.

[daconfusion]

This is a good post... Is it possible to drive back EMF if z axis slides down after shutting mill down?

[Jim Dawson]

This is a good post... Is it possible to drive back EMF if z axis slides down after shutting mill down?

Nothing damaging. The motor would have to turn pretty fast to generate enough power to hurt anything, and gravity wouldn't be enough to do it.

[arizonavideo]

A falling Z toasted my Gecko drive on my IH mill, Back EMF can do damage. Placing the cap like they said should help the PS from over reacting to a short over current event.

[Jim Dawson]

A falling Z toasted my Gecko drive on my IH mill, Back EMF can do damage. Placing the cap like they said should help the PS from over reacting to a short over current event.

I stand corrected I didn't think that would be possible.