Re: [CAD_CAM_EDM_DRO] Re: Bleed Resistor... Do geckos need a fan?
Posted by
Russ Waters
on 2004-09-22 12:05:21 UTC
Hi all, if I may butt in.... I went to the Gecko web support page, and they didn't show or say anything about a "bleed" resistor in there drawing of the power supply.
The information on the Gecko site is a very good for anyone who is making there own controller! This is where I started, before making my own controllers.....
Russ
turbulatordude <davemucha@...> wrote:
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "industrialhobbies"
wrote:
power supply. But, they are a few years old and maybe the new ones
are more efficient ?
But, then that purpose would be a load resistor, no ?
excess charge during no operating times. The maximum voltage will be
a function of the transformer and line voltage. It is a running
motor that offers the potential of adding voltage greater than the
power supply, but, running motors also means the drivers are using
power.
assuming 12 amps, 50 volts, and a 20,000uF cap. a 5 watt 500 ohm
resistor will offer a time constant of just unde 10 seconds so a cap
will blead down in roughly 30 seconds.
inside the box often, then a light would be a better indicator than a
hot resistor. If your box is closed and out of the way, you should
not be able to get bitten and in that case, the drivers should bleed
the charge.
It is my opinion that a bleed resistor is completely optional.
Dave
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The information on the Gecko site is a very good for anyone who is making there own controller! This is where I started, before making my own controllers.....
Russ
turbulatordude <davemucha@...> wrote:
--- In CAD_CAM_EDM_DRO@yahoogroups.com, "industrialhobbies"
wrote:
> YES you do NEED a bleed resistor.Does
>
> The resistor provided 2 functions:
>
> It puts a minimal load on the power supply at all times (a Gecko
> Not),This must be something new. My Gecko's do put a minimal load on my
power supply. But, they are a few years old and maybe the new ones
are more efficient ?
But, then that purpose would be a load resistor, no ?
> this limits an unregulated power supply's tendency to "floatof
> high".
>
> It will also bleed the excess charge from the cap. With the sort
> draw you mentioned you have a pretty healthy power supply and aThe driver will use some power from the PS so there will not be
> pretty healthy cap.
excess charge during no operating times. The maximum voltage will be
a function of the transformer and line voltage. It is a running
motor that offers the potential of adding voltage greater than the
power supply, but, running motors also means the drivers are using
power.
assuming 12 amps, 50 volts, and a 20,000uF cap. a 5 watt 500 ohm
resistor will offer a time constant of just unde 10 seconds so a cap
will blead down in roughly 30 seconds.
> If you've ever been "bitten" by a cap you'llThis goes to the question of why you need or want one. If you are
> know it hurts a lot. Get the resistor.
inside the box often, then a light would be a better indicator than a
hot resistor. If your box is closed and out of the way, you should
not be able to get bitten and in that case, the drivers should bleed
the charge.
It is my opinion that a bleed resistor is completely optional.
Dave
> If you don't believe me, look up a few folks who sell them (I sellserve
> them as well), they will ALWAYS include a bleed resistor. They
> a valid purpose.to
>
> You may also want a dump resistor (tied to an E-Stop), that's you
> you.goop,
>
> Also, a Gecko is a solid state device and although the G320's or
> G340's you have are rated for 20A they like to be cool. All solid
> state devices like to be cool, the cooler the better. Get the
> Radio Shack has if for a few bucks, one tube will cover you.peak
>
>
> Thanks
> Aaron Moss
> www.IndustrialHobbies.com
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "AbbyKatt" wrote:
> > I was wondering..
> >
> > Power supply is all nice and working now, and am about to hook it
> all up
> > to the geckos.
> > I was wondering: Do I need a bleed resistor across my cap? What
> happens
> > if I neglect to put one in?
> >
> > Also, do I need a fan for geckos, I'm only going to be doing a
> ofaluminium.
> > 12 amps @ 50V, and I have it already bolted to some nice
> WillAddresses:
> > I need thermal paste?
> >
> > Thanks!
> > ~Abby
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If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble.
http://www.metalworking.com/news_servers.html
http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list.
NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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Discussion Thread
jas_mary
2004-08-04 20:17:59 UTC
What's the best software for a CNC SHOPTASK setup (MILL & LATHE)
gfull
2004-09-21 14:20:31 UTC
Re: What's the best software for a CNC SHOPTASK setup (MILL & LATHE)
AbbyKatt
2004-09-21 15:05:06 UTC
Bleed Resistor... Do geckos need a fan?
Robert Campbell
2004-09-21 16:39:05 UTC
Re: [CAD_CAM_EDM_DRO] Bleed Resistor... Do geckos need a fan?
R Rogers
2004-09-21 17:47:44 UTC
Re: [CAD_CAM_EDM_DRO] Bleed Resistor... Do geckos need a fan?
Robert Campbell
2004-09-21 18:08:26 UTC
Re: [CAD_CAM_EDM_DRO] Bleed Resistor... Do geckos need a fan?
turbulatordude
2004-09-21 18:15:50 UTC
Re: Bleed Resistor... Do geckos need a fan?
industrialhobbies
2004-09-21 19:25:51 UTC
Re: Bleed Resistor... Do geckos need a fan?
turbulatordude
2004-09-22 01:05:06 UTC
Re: Bleed Resistor... Do geckos need a fan?
Russ Waters
2004-09-22 12:05:21 UTC
Re: [CAD_CAM_EDM_DRO] Re: Bleed Resistor... Do geckos need a fan?
turbulatordude
2004-09-22 13:53:25 UTC
Re: Bleed Resistor... Do geckos need a fan?
Gregory Kamysz
2004-09-22 19:43:26 UTC
Re: [CAD_CAM_EDM_DRO] Re: Bleed Resistor... Do geckos need a fan?