CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] power supply

Posted by Les Newell
on 2001-10-16 12:27:16 UTC
The outputs of a transformer are given at full rated load. The output
voltage will rise as the load is reduced. In the full specs there will be a
figure for how well the transformer regulates it's output. ISTR that
toroidal transformers are much better in this respect. Also remember that
mains voltage is a nominal value and can vary quite widely.

I wouldn't worry about it unless the off load voltage exceeds the rated
voltage of the controller. I definately wouldn't put a zener across the
output. If the mains voltage rises for any reason (and sod's law says it
probably will at some point) you could easily fry the zener. At work we have
a 2KW high frequency spindle on a cnc router that occasionally trips out due
to overvoltage. Unfortunately the controller doesn't realise this and keeps
going - we have a good selection of boomerang shaped cutters!

Les

PS Discharging the caps with a screwdriver is more fun (bang!) but it can
damage the caps.

> How dependable are transformer specs?
>
> A Single phase 0-115-230V primary 24VAC secondary connected to a
> bridge rectifier and 15,000uF capacitor should produce 33 VDC. The
> actual output was 46VDC. The culprit? On checking the transformer
> secondary, the output was 33VAC instead of the specified 24VAC. Is
> this common experience?
>
> Based on what had been so emphatically put across recently, one
> should have no hesitation on using this power supply despite it being
> out of specs - voltage being so unimportant for steppers, right?
>
> Just to be on the safe side - what size zener diode should one place
> across the output?
>
> Peter
>
> BTW one should take care to discharge the capacitor, say, across an
> incandescent lamp at end of test.
>

Discussion Thread

wanliker@a... 2001-10-14 12:06:43 UTC Members Art Fenerty 2001-10-14 12:51:59 UTC Re: [CAD_CAM_EDM_DRO] Members JanRwl@A... 2001-10-14 13:23:28 UTC Re: [CAD_CAM_EDM_DRO] Members cadcamcenter@y... 2001-10-14 17:38:02 UTC Re: Members Art Fenerty 2001-10-14 18:38:44 UTC Re: [CAD_CAM_EDM_DRO] Re: Members JanRwl@A... 2001-10-14 18:43:33 UTC Re: [CAD_CAM_EDM_DRO] Re: Members Art Fenerty 2001-10-14 19:07:52 UTC Re: [CAD_CAM_EDM_DRO] Re: Members cadcamcenter@y... 2001-10-14 19:19:07 UTC Re: Members Tim Goldstein 2001-10-14 19:57:00 UTC RE: [CAD_CAM_EDM_DRO] Re: Members wanliker@a... 2001-10-14 21:08:49 UTC Re: [CAD_CAM_EDM_DRO] Re: Members cadcamcenter@y... 2001-10-15 06:24:45 UTC Re: Members Tim Goldstein 2001-10-15 07:05:03 UTC Re: [CAD_CAM_EDM_DRO] Re: Members JanRwl@A... 2001-10-15 09:57:10 UTC Re: [CAD_CAM_EDM_DRO] Re: Members Alan Marconett KM6VV 2001-10-15 11:30:33 UTC Re: Members Tim 2001-10-15 12:41:25 UTC RE: [CAD_CAM_EDM_DRO] Re: Members Art Fenerty 2001-10-15 12:45:31 UTC Re: [CAD_CAM_EDM_DRO] Re: Members machines@n... 2001-10-15 13:31:45 UTC Re: Members Art Fenerty 2001-10-15 14:44:04 UTC Re: [CAD_CAM_EDM_DRO] Re: Members Alan Trest 2001-10-15 15:47:26 UTC Re: Members cadcamcenter@y... 2001-10-15 16:30:21 UTC Re: Members Alan Marconett KM6VV 2001-10-15 17:02:57 UTC Re: Members Tom Murray 2001-10-15 18:37:21 UTC Re: Members brian 2001-10-15 19:48:45 UTC Re: [CAD_CAM_EDM_DRO] Re: Members Sven Peter 2001-10-15 20:37:06 UTC Re: [CAD_CAM_EDM_DRO]Members Michael Dhabolt 2001-10-15 20:55:03 UTC Re: [CAD_CAM_EDM_DRO] Re: Members Jon Elson 2001-10-15 22:04:24 UTC Re: [CAD_CAM_EDM_DRO] Re: Members Jon Elson 2001-10-15 22:08:18 UTC Re: [CAD_CAM_EDM_DRO] Re: Members Carol & Jerry Jankura 2001-10-16 06:22:48 UTC RE: [CAD_CAM_EDM_DRO] Re: Members Smoke 2001-10-16 07:10:34 UTC Re: [CAD_CAM_EDM_DRO] Re: Members HighTech 2001-10-16 08:00:31 UTC RE: [CAD_CAM_EDM_DRO] Re: Members Jon Elson 2001-10-16 10:16:35 UTC Re: [CAD_CAM_EDM_DRO] Re: Members Jon Elson 2001-10-16 10:28:58 UTC Re: [CAD_CAM_EDM_DRO] Re: Members Smoke 2001-10-16 10:29:59 UTC Re: [CAD_CAM_EDM_DRO] Re: Members cadcamcenter@y... 2001-10-16 10:31:08 UTC power supply Bob Campbell 2001-10-16 11:00:09 UTC Re: [CAD_CAM_EDM_DRO] power supply Alan Marconett KM6VV 2001-10-16 11:02:42 UTC Re: [CAD_CAM_EDM_DRO] power supply Carol & Jerry Jankura 2001-10-16 11:11:20 UTC RE: [CAD_CAM_EDM_DRO] Re: Members Art Fenerty 2001-10-16 11:18:49 UTC Re: [CAD_CAM_EDM_DRO] Re: Members Les Newell 2001-10-16 12:27:16 UTC Re: [CAD_CAM_EDM_DRO] power supply mariss92705@y... 2001-10-16 13:11:55 UTC Re: Members beer@s... 2001-10-16 13:17:04 UTC Re: Members Paul 2001-10-16 14:39:35 UTC Re: [CAD_CAM_EDM_DRO] Re: Members beer@s... 2001-10-16 15:55:58 UTC Re: power supply JanRwl@A... 2001-10-16 16:37:40 UTC Re: [CAD_CAM_EDM_DRO] power supply cadcamcenter@y... 2001-10-16 16:51:42 UTC Re: power supply mariss92705@y... 2001-10-16 17:26:20 UTC Re: power supply mariss92705@y... 2001-10-16 17:30:24 UTC Re: power supply Alan Marconett KM6VV 2001-10-16 17:36:19 UTC Re: power supply cadcamcenter@y... 2001-10-16 18:42:31 UTC Re: Members cadcamcenter@y... 2001-10-16 18:55:21 UTC Re: power supply brian 2001-10-16 19:50:52 UTC Re: [CAD_CAM_EDM_DRO] Re: Members mariss92705@y... 2001-10-16 19:54:17 UTC Re: Members Jon Elson 2001-10-16 20:13:13 UTC Re: [CAD_CAM_EDM_DRO] Re: Members Ron Knittle 2001-10-16 21:36:44 UTC Re: [CAD_CAM_EDM_DRO] Re: Members cncforum 2002-02-03 10:04:42 UTC power supply Bob Campbell 2002-02-03 11:56:43 UTC Re: [CAD_CAM_EDM_DRO] power supply JanRwl@A... 2002-02-03 12:51:23 UTC Re: [CAD_CAM_EDM_DRO] power supply Jon Elson 2002-02-03 22:08:43 UTC Re: [CAD_CAM_EDM_DRO] power supply ballendo 2002-02-04 07:52:15 UTC Ground loops and star wiring was Re: power supply Raymond Heckert 2002-02-04 14:07:25 UTC Re: [CAD_CAM_EDM_DRO] power supply Gene 2002-03-07 22:46:13 UTC power supply Mike Snodgrass 2002-09-12 05:42:58 UTC power supply turbulatordude 2002-09-12 07:07:48 UTC Re: power supply bsptrades 2002-09-12 10:18:00 UTC Re: power supply mariss92705 2002-09-12 11:10:36 UTC Re: power supply Mike Snodgrass 2002-09-12 16:53:46 UTC Re: [CAD_CAM_EDM_DRO] Re: power supply Alan Marconett KM6VV 2002-09-12 17:27:55 UTC Re: [CAD_CAM_EDM_DRO] Re: power supply Jon Elson 2002-09-12 22:31:29 UTC Re: [CAD_CAM_EDM_DRO] Re: power supply Lee Studley 2002-09-13 10:42:48 UTC Re: power supply Yesamazza@a... 2002-12-28 21:25:25 UTC power supply Robert Campbell 2002-12-29 06:04:49 UTC Re: [CAD_CAM_EDM_DRO] power supply turbulatordude <davemucha@j... 2002-12-29 06:51:13 UTC Re: power supply Yesamazza@a... 2002-12-29 09:02:08 UTC Re: [CAD_CAM_EDM_DRO] power supply turbulatordude <davemucha@j... 2002-12-29 10:37:56 UTC Re: power supply Ron Yost 2002-12-29 11:48:43 UTC Re: [CAD_CAM_EDM_DRO] Re: power supply RichD 2002-12-29 13:17:26 UTC Re: [CAD_CAM_EDM_DRO] Re: power supply turbulatordude <davemucha@j... 2002-12-29 13:52:49 UTC Re: power supply Ron Yost 2002-12-29 14:11:42 UTC Re: [CAD_CAM_EDM_DRO] Re: power supply Ron Yost 2002-12-29 14:14:51 UTC Re: [CAD_CAM_EDM_DRO] Re: power supply Tim Goldstein 2002-12-29 14:34:13 UTC RE: [CAD_CAM_EDM_DRO] Re: power supply afogassa 2003-09-08 18:50:44 UTC power supply afogassa 2003-09-10 15:02:44 UTC power supply motorworksnf 2004-02-01 14:06:37 UTC power supply Doug Fortune 2004-02-01 15:10:07 UTC Re: [CAD_CAM_EDM_DRO] power supply