CAD CAM EDM DRO - Yahoo Group Archive

Re: [CAD_CAM_EDM_DRO] Re: power supply

on 2002-09-12 16:53:46 UTC
Bummer! it seemed like a good one. Is there another way to trim the
voltage other than huge , hot, nasty, power resistors or bulky variac?





----- Original Message -----
From: "mariss92705" <mariss92705@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Thursday, September 12, 2002 12:10 PM
Subject: [CAD_CAM_EDM_DRO] Re: power supply


> Hi,
>
> Besides agreeing with everything Brian said I would also add triacs
> and SCRs can "full cycle". This means they can trigger at the zero-
> crossing in the event a noise pulse trips them off. Not a problem
> with a light bulb but a big problem with a power supply that suddenly
> goes to 160VDC for a cycle or two.
>
> Mariss
>
> --- In CAD_CAM_EDM_DRO@y..., "bsptrades" <bspunkar@a...> wrote:
> > The Triac/ dimmer approach does not sound like a good idea to me
> for
> > voltage limiting.
> >
> > If the Triac fires in quadrant 1or 3 of the AC wave form you will
> > still see the full AC mains voltage on the transformer . You are
> now
> > relying on the fact that the Triac is limiting the "effective
> power"
> > of the AC wave form. This works only because the coil resistance
> and
> > circuit components limit the peak current in the secondary charging
> > the bulk capacitor.
> >
> > For a steady load you can achieve a current balance that works
> well
> > enough but the motor controls are dynamic. As soon as the drives
> > revert to a regenerative braking the current draw drops or
> reverses.
> > This will allow the bulk capacitor to charge to full voltage very
> > quickly as it is being helped by both the AC input and regenerative
> > energy.
> >
> > Limiting the Triac to the falling edge of the cycle Quadrants 2
> and
> > 4 is possible but now your peak current capacity will be very low
> as
> > the "effective" power to the bulk capacitor is well under 50% max.
> >
> > I think this approach will cause problems without a very wide
> safety
> > margin.
> >
> > Brian
> > BSP
> >
> >
> > --- In CAD_CAM_EDM_DRO@y..., "Mike Snodgrass" <snarf@s...> wrote:
> > > On my ongoing search to use easily available and cheap
> solutions...
> > I have several step down transformers that I would like to use as
> > power supplies. The problem is that after inputing 120V I get 82V
> > output after filtering and rectifying. 2V over the threshhold of
> my
> > drive. I installed a easily available light dimmer in the input
> and
> > after applying load I can precisly control voltage. These units
> are
> > rated at 600W, the thyristor in the unit can be paralled to give
> > more current or use a heavier one designed for router speed
> control.
> > I also mounted a cheap VOM in the circuit to monitor voltage.
> > >
> > >
> > > [Non-text portions of this message have been removed]
>
>
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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