CAD CAM EDM DRO - Yahoo Group Archive

Re: Stepper power supplies, unregulated

on 2000-12-03 09:11:04 UTC
Hi,

A 10K resistor really does not make much of a difference. The RC time
constant would be 10,000 times .04, or 400 seconds. 3 time constants
would be considered discharged (5% of original voltage) for a total
time of 1,200 seconds. That is 20 minutes.

Mariss

--- In CAD_CAM_EDM_DRO@egroups.com, ballendo@y... wrote:
> JMW asked:
> >Ballendo, how do you size the drain resistor?
> >Another idea is to put an LED on the capacitor as a warning, at
> >least that's what Magnetek did on the VFD out in the garage.
>
> I have to admit the "empirical toolbox" approach here. I used a 10k
> 2W resistor on a 40000uf Cap. The standard said it had to
be "below"
> a certain voltage within a certain time, and it just seemed faster
> to "parts drawer" the answer by observation.
>
> Yes, the "power" LED DOES give a "visual", but it doesn't meet the
> safety standard!
>
> Ballendo

Discussion Thread

ballendo@y... 2000-12-03 05:14:13 UTC Re: Stepper power supplies, unregulated jmw@c... 2000-12-03 05:23:08 UTC Re: Stepper power supplies, unregulated ballendo@y... 2000-12-03 06:20:25 UTC Re: Stepper power supplies, unregulated Mariss Freimanis 2000-12-03 09:11:04 UTC Re: Stepper power supplies, unregulated Wally K 2000-12-03 09:57:11 UTC Re: Stepper power supplies, unregulated and Zener selection Mariss Freimanis 2000-12-03 11:24:21 UTC Re: Stepper power supplies, unregulated and Zener selection Wally K 2000-12-03 11:32:21 UTC Re: Stepper power supplies, unregulated and Zener selection Mariss Freimanis 2000-12-03 11:40:39 UTC Re: Stepper power supplies, unregulated and Zener selection Mike 2000-12-03 11:41:45 UTC Bobcad 17 Review Wally K 2000-12-03 12:13:58 UTC Re: Stepper power supplies, unregulated and Zener selection Smoke 2000-12-03 12:19:15 UTC Re: [CAD_CAM_EDM_DRO] Bobcad 17 Review Mike 2000-12-03 13:32:39 UTC Re: Bobcad 17 Review Smoke 2000-12-03 13:46:12 UTC Re: [CAD_CAM_EDM_DRO] Re: Bobcad 17 Review ballendo@y... 2000-12-03 14:54:57 UTC Re: Stepper power supplies, unregulated Mike 2000-12-03 15:43:48 UTC Re: Bobcad 17 Review Mariss Freimanis 2000-12-03 17:06:46 UTC Re: Stepper power supplies, unregulated and Zener selection Mariss Freimanis 2000-12-03 17:17:40 UTC Re: Stepper power supplies, unregulated ptengin@a... 2000-12-03 19:36:17 UTC Re: [CAD_CAM_EDM_DRO] Re: Bobcad 17 Review Mike 2000-12-03 21:00:13 UTC Re: Bobcad 17 Review Tim Goldstein 2000-12-03 22:56:56 UTC RE: [CAD_CAM_EDM_DRO] Re: Bobcad 17 Review Fred Smith 2000-12-04 03:39:56 UTC Re:Bobcad 17 Review ballendo@y... 2000-12-04 03:52:05 UTC re:Re: Bobcad 17 Review Smoke 2000-12-04 06:28:00 UTC Re: [CAD_CAM_EDM_DRO] Re:Bobcad 17 Review Fred Smith 2000-12-04 06:43:54 UTC Re:Bobcad 17 Review Smoke 2000-12-04 06:54:01 UTC Re: [CAD_CAM_EDM_DRO] Re:Bobcad 17 Review Wally K 2000-12-04 07:17:58 UTC Re:Bobcad 17 Review Tim Goldstein 2000-12-04 08:17:35 UTC RE: [CAD_CAM_EDM_DRO] Re:Bobcad 17 Review Fred Smith 2000-12-04 08:30:46 UTC Re:Bobcad 17 Review Mike 2000-12-04 10:36:06 UTC Re: Bobcad 17 Review Wally K 2000-12-04 12:32:40 UTC Re:Bobcad 17 Review Steve Greenfield 2000-12-04 13:40:30 UTC Re: Stepper power supplies, unregulated and Zener selection Fred Smith 2000-12-04 14:52:30 UTC Re:Bobcad 17 Review Smoke 2000-12-04 15:02:42 UTC Re: [CAD_CAM_EDM_DRO] Re:Bobcad 17 Review Wally K 2000-12-04 15:40:58 UTC Re:Bobcad 17 Review James Owens 2000-12-04 15:46:39 UTC Re:Bobcad 17 Review Fred Smith 2000-12-04 18:29:14 UTC Re:Bobcad 17 Review