Group: DynoMotion	Message: 11339	From: cnc_machines	Date: 4/10/2015
Subject: KStep Disable

Tom,

I see that many stepper drives can be damaged if they have the DC power supply disconnected on the E-Stop. Is this the case with the KStep? I could break power on the AC side but it takes a few seconds for the capacitors to discharge. I would prefer to do it on the DC side if it wouldnt damage the drive.

Thanks,

Scott

Group: DynoMotion	Message: 11343	From: Tom Kerekes	Date: 4/10/2015
Subject: Re: KStep Disable

Hi Scott,

Switching the DC Side is probably not a good idea. The main issue is switching back on. The relatively large capacitors on KSTEP will cause a huge current draw.

I would think the Motor supply would discharge in a fraction of a second if the motors are energized and drawing a few watts.

20,000uF x 48V =1 watt second

Another option ismight be to externally disable KStep based on EStop (as well as removing AC Power).

Regards