andy pugh schrieb:
Have you
considered using a 1:1 transformer?
Yes, but I can't find one. (or not one rated at 15A / 240V anyway)
Andy, I have one here that will deliver this power easily. It used to
power a hospital supply where all electrical gear must be floating. The
only
On 7 September 2011 07:53, Peter Blodow p.blo...@dreki.de wrote:
Yes, but I can't find one. (or not one rated at 15A / 240V anyway)
Andy, I have one here that will deliver this power easily. It used to
power a hospital supply where all electrical gear must be floating. The
only problem would
On Tue, 6 Sep 2011 23:30:11 +0100, you wrote:
On 6 September 2011 23:14, Steve Blackmore st...@pilotltd.net wrote:
I've regularly seen much higher than a few volts. I think it depends a
lot on location and local wiring condition/type and ground conditions.
I am not sure I want to think to
[mailto:bodge...@gmail.com]
Sent: Wednesday, September 07, 2011 4:35 AM
To: Enhanced Machine Controller (EMC)
Subject: Re: [Emc-users] Servo PSU
On 7 September 2011 07:53, Peter Blodow p.blo...@dreki.de wrote:
Yes, but I can't find one. (or not one rated at 15A / 240V anyway)
Andy, I have one
On Wednesday, September 07, 2011 08:35:06 AM Steve Blackmore did opine:
On Tue, 6 Sep 2011 23:30:11 +0100, you wrote:
On 6 September 2011 23:14, Steve Blackmore st...@pilotltd.net wrote:
I've regularly seen much higher than a few volts. I think it depends
a lot on location and local wiring
(EMC)
Subject: Re: [Emc-users] Servo PSU
On 7 September 2011 07:53, Peter Blodow p.blo...@dreki.de wrote:
Yes, but I can't find one. (or not one rated at 15A / 240V anyway)
Andy, I have one here that will deliver this power easily. It used to
power a hospital supply where all
On 7 September 2011 13:57, Peter Blodow p.blo...@dreki.de wrote:
In the UK, they have generally a nominal
240 volts mains supply (don't know about the tolerances).
We basically have the same nominal as the rest of the EU, but with the
tolerances switched, so that we could be common with the
On 9/7/2011 5:34 AM, andy pugh wrote:
On 7 September 2011 07:53, Peter Blodowp.blo...@dreki.de wrote:
Yes, but I can't find one. (or not one rated at 15A / 240V anyway)
Andy, I have one here that will deliver this power easily. It used to
power a hospital supply where all
I have made a servo PSU. It simply rectifies mains voltage to give me 325V DC.
https://picasaweb.google.com/lh/photo/HdNJXBD5wPqDUi9E8C46HQ?feat=directlink
https://picasaweb.google.com/lh/photo/dTcU2i7GYh53xSrqjh--BQ?feat=directlink
There is a bit of extra componentry in the box to discharge the
On Tue, 6 Sep 2011, andy pugh wrote:
Date: Tue, 6 Sep 2011 14:34:24 +0100
From: andy pugh bodge...@gmail.com
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: [Emc-users] Servo PSU
Hi Andy;
Some years ago the US code requires earth ground and common line to be
isolated. This prevents voltage drop in the common line jacking up voltage
on the equipment. The transformer will isolate the common return for you so
your equipment will stay at earth ground and you won't glow in the
On 6 Sep 2011, at 15:21, Don Stanley dstanley1...@gmail.com wrote:
The transformer will isolate the common return for you so
your equipment will stay at earth ground and you won't glow in the dark when
you touch it.
Which transformer?
Does the Drive care that the DC is not referenced to
On Tue, 6 Sep 2011, Andy Pugh wrote:
Date: Tue, 6 Sep 2011 15:47:01 +0100
From: Andy Pugh bodge...@gmail.com
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: Re: [Emc-users] Servo
Andy,
looks like a neatly made power box. Rectifying AC line power without
potential insulation, however, is unusual and bears some risks.
- Be aware that both of your DC lines will have potential to ground,
none can be grounded.
- Be sure that every metallic enclosure that is powered by this
andy pugh wrote:
I have made a servo PSU. It simply rectifies mains voltage to give me 325V DC.
https://picasaweb.google.com/lh/photo/HdNJXBD5wPqDUi9E8C46HQ?feat=directlink
https://picasaweb.google.com/lh/photo/dTcU2i7GYh53xSrqjh--BQ?feat=directlink
There is a bit of extra componentry in the
On 6 September 2011 17:15, Peter Blodow p.blo...@dreki.de wrote:
- Think about the effects that plugging the mains plug 180 degrees
turned over could have, don't rely on wires having seemingly no
potential in one case!
This isn't possible with UK wiring.
Also, UK 240V single phase is neutral
On 6 September 2011 17:36, Jon Elson el...@pico-systems.com wrote:
No, if you rectify the mains, the -V terminal will NOT be anywhere near
neutral. It will
essentially be floating near whichever mains terminal is currently more
negative than
the other. So, it will be swinging 120 times a
On Tue, 6 Sep 2011, Peter Blodow wrote:
Date: Tue, 06 Sep 2011 18:15:33 +0200
From: Peter Blodow p.blo...@dreki.de
Reply-To: Enhanced Machine Controller (EMC)
emc-users@lists.sourceforge.net
To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net
Subject: Re: [Emc-users
On Tue, 2011-09-06 at 17:57 +0100, andy pugh wrote:
On 6 September 2011 17:15, Peter Blodow p.blo...@dreki.de wrote:
- Think about the effects that plugging the mains plug 180 degrees
turned over could have, don't rely on wires having seemingly no
potential in one case!
This isn't
Andy;
Sorry for being cryptic. The 1:1 isolation transformer you considered.
It could be a step up or step down if you wanted different DC voltage.
Consider that the DC output of the rectifier and filter will be about
1.5 times the AC voltage
Hook the input power to the transformer input leads
On 6 September 2011 23:14, Steve Blackmore st...@pilotltd.net wrote:
I've regularly seen much higher than a few volts. I think it depends a
lot on location and local wiring condition/type and ground conditions.
I am not sure I want to think to hard about this, because then I will
end up
I am trusting to cleverer folk than myself for that part.
Also, make sure the motor connections are very
well-made,
The motor connector plugs cost more than the motors. They ought to be
up to the job.
http://sineco.3dcartstores.com/assets/images/PDFs/DataSheets/MB1CKN0600.pdf
On Tuesday, September 06, 2011 10:16:17 PM andy pugh did opine:
I have made a servo PSU. It simply rectifies mains voltage to give me
325V DC.
https://picasaweb.google.com/lh/photo/HdNJXBD5wPqDUi9E8C46HQ?feat=direc
tlink
https://picasaweb.google.com/lh/photo/dTcU2i7GYh53xSrqjh--BQ?feat=direc
andy pugh wrote:
It's UK single phase, and neutral is only ever a few volts from earth.
OK, then the V- is swinging 50 times a second between -168 V from
neutral and approximately
equal to neutral.
Obviously you have full galvanic isolation between the power transistors
and the
On Tuesday, September 06, 2011 10:19:35 PM Andy Pugh did opine:
On 6 Sep 2011, at 15:21, Don Stanley dstanley1...@gmail.com wrote:
The transformer will isolate the common return for you so
your equipment will stay at earth ground and you won't glow in the
dark when you touch it.
Which
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