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Major Power Supply grounding

2010-01-18 by electronicpressskit

So today I was using my Modcan/Cynthia system and cross patching with my Driscoll/Serge system and ran into some grounding issues.

The Modcan/Cynthia rig is powered with a Cynthia Major PSU and the Serge/Driscoll rig is powered with a power-one supply I got from ebay and wired up myself.

On the PSU I wired, I took the signal ground to my ground jack to use when connecting to other PSU's.  Upon examining the Major PSU I found that the grounding jack is connected to the PSU chassis and the earth ground.

After discovering this I remembered I had a Serge PS6 in my closet so I opened it up and the ground jack is indeed connected to the signal ground.

I'm wondering if this is how the Cynthia PSU is supposed to be wired?  I can't figure out how it makes sense to wire it that way.

Anyone have an explanation?

epk

Re: Major Power Supply grounding

2010-01-18 by electronicpressskit

It's good know that it's not done this way anymore.  Is this change documented somewhere?  I didn't see it on the power faq.  

Isn't this a potentially dangerous configuration?  

I had a TR-909 running on my supply that started resetting itself while the the grounds were connected.  For months I've experienced other grounding issues while interfacing my Serge/Driscoll rig with other gear just because the signal ground was connected to the Major Power Supply, even when it was turned off.

It seems like I need to not only disconnect the jack from earth ground but also disconnect it from chassis ground and then connect the jack to signal ground.

epk

--- In The_Cyndustries_List@yahoogroups.com, Cynthia Webster <cynthia.webster@...> wrote:

Show quoted textHide quoted text

>
> Some of the earlier Power Supplies connected to the green ground jack to 
> the chassis ground but we stopped doing that some time ago.
> you Can simply snip the wire to earth if you like, or ad a switch as a 
> ground lifter.
> 
> More about the subject here
> 
> http://www.cyndustries.com/modules_powerdist-FAQ.cfm
> 
> Best Wishes!
> 
> Cynthia
> 
> http://launch.groups.yahoo.com/group/The_Cyndustries_List/
> 
> 
> 
> 
> 
> electronicpressskit wrote:
> >  
> >
> > So today I was using my Modcan/Cynthia system and cross patching with 
> > my Driscoll/Serge system and ran into some grounding issues.
> >
> > The Modcan/Cynthia rig is powered with a Cynthia Major PSU and the 
> > Serge/Driscoll rig is powered with a power-one supply I got from ebay 
> > and wired up myself.
> >
> > On the PSU I wired, I took the signal ground to my ground jack to use 
> > when connecting to other PSU's. Upon examining the Major PSU I found 
> > that the grounding jack is connected to the PSU chassis and the earth 
> > ground.
> >
> > After discovering this I remembered I had a Serge PS6 in my closet so 
> > I opened it up and the ground jack is indeed connected to the signal 
> > ground.
> >
> > I'm wondering if this is how the Cynthia PSU is supposed to be wired? 
> > I can't figure out how it makes sense to wire it that way.
> >
> > Anyone have an explanation?
> >
> > epk
> >
> >
>

Re: [The_Cyndustries_List] Major Power Supply grounding

2010-01-18 by Cynthia Webster

Some of the earlier Power Supplies connected to the green ground jack to the chassis ground but we stopped doing that some time ago.
you Can simply snip the wire to earth if you like, or ad a switch as a ground lifter.

More about the subject here

http://www.cyndustries.com/modules_powerdist-FAQ.cfm

Best Wishes!

Cynthia

http://launch.groups.yahoo.com/group/The_Cyndustries_List/

electronicpressskit wrote:

Show quoted textHide quoted text

So today I was using my Modcan/Cynthia system and cross patching with my Driscoll/Serge system and ran into some grounding issues.

The Modcan/Cynthia rig is powered with a Cynthia Major PSU and the Serge/Driscoll rig is powered with a power-one supply I got from ebay and wired up myself.

On the PSU I wired, I took the signal ground to my ground jack to use when connecting to other PSU's. Upon examining the Major PSU I found that the grounding jack is connected to the PSU chassis and the earth ground.

After discovering this I remembered I had a Serge PS6 in my closet so I opened it up and the ground jack is indeed connected to the signal ground.

I'm wondering if this is how the Cynthia PSU is supposed to be wired? I can't figure out how it makes sense to wire it that way.

Anyone have an explanation?

epk

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Major Power Supply grounding

Major Power Supply grounding

Re: Major Power Supply grounding

Re: [The_Cyndustries_List] Major Power Supply grounding

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