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More Power Supply questions
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elmegil



Joined: Mar 20, 2012
Posts: 1475
Location: Chicago
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PostPosted: Sat Aug 17, 2013 8:20 pm    Post subject: More Power Supply questions
Subject description: Power One overload protection wiring?
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I just got a new (to me, but very nice and clean) Power One supply at a very good price (thank you ebay!)

I noted that "out+" and "out-" are already wired to a little 1.5" square board that has something on it about OVP Adjust (and a trimmer). I haven't seen this on my previous purchases. So that leads me to a few questions:

1) I don't know what I might need to do to trim that (or if I do)
2) do I use "out+" and "out-" for my power distribution, or do I use S+ and S- (which aren't connected to anything else obvious).

Thanks....
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JeanFé



Joined: Feb 03, 2013
Posts: 5
Location: France

PostPosted: Mon Aug 19, 2013 7:32 am    Post subject: Reply with quote  Mark this post and the followings unread

Hi Emelgil,

1) trim them until you get a nice -/+15V or -/+12V off PSU
2) these are sense terminals, to compensate voltage drops. you need to connect -S to -Out, +S to +Out, and +S/-S to COM (ground)

Check also if jumpers on the transformer are right Wink
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elmegil



Joined: Mar 20, 2012
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Location: Chicago
Audio files: 14

PostPosted: Mon Aug 19, 2013 7:56 am    Post subject: Reply with quote  Mark this post and the followings unread

JeanFé wrote:
Hi Emelgil,

1) trim them until you get a nice -/+15V or -/+12V off PSU



I'm confused though; there are trimmers on the main board for this, I've used them on all the other power supplies. I'm talking about a single trimmer on this secondary small board that appears to have something to do with overload protection.


JeanFé wrote:

2) these are sense terminals, to compensate voltage drops. you need to connect -S to -Out, +S to +Out, and +S/-S to COM (ground)

Check also if jumpers on the transformer are right Wink



I have checked the transformer jumpers, they match the table on the front for what I want to do. And the commons are all connected together as expected.

Thanks!
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JeanFé



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PostPosted: Mon Aug 19, 2013 9:19 am    Post subject: Reply with quote  Mark this post and the followings unread

OK, mine must be older than yours then (HAA15-0.8 / Sept. 1988), as I don't have any additional board.

A pic would probably help..
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elmegil



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PostPosted: Mon Aug 19, 2013 10:28 am    Post subject: Reply with quote  Mark this post and the followings unread

Yah, I probably should have done that.

Here we go:


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analog_backlash



Joined: Sep 04, 2012
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PostPosted: Mon Aug 19, 2013 12:41 pm    Post subject: Reply with quote  Mark this post and the followings unread

Hi elmegil.

I don't know if this will help at all, but I've looked at datasheets for Power One's PSUs e.g.:

http://www.westfloridacomponents.com/mm5/graphics/ds6/SeriesIntl-PowerOne.pdf

The overvoltage protection board (OVP12) seems almost identical to the one in your photograph and seems to be an optional add-on circuit, so I guess that you don't have to use it if you don't want to. As for adjusting it, I'm not sure that the datasheet helps much.

Gary
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elmegil



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PostPosted: Mon Aug 19, 2013 1:06 pm    Post subject: Reply with quote  Mark this post and the followings unread

Yah, that's definitely it.

Bah on no good docs online (at least in the searching I've done so far)

I did find this: http://us.tdk-lambda.com/ftp/AppNotes/HSeriesANmanual.pdf

Edit: And here we go: http://us.tdk-lambda.com/ftp/Manuals/LLS6_8_9000Inst.pdf It's for a Lambda supply, but something I saw indicated that the OVP was a Lambda part.

Summary version:

set OVP to max (full clockwise)
set voltage output to desired trip point (V + 15%)
turn OVP pot ccw until it trips
disconnect from input power
set voltage output down a bit
turn it back on
adjust the voltage to the nominal value.


I'm assuming since it spans V+ to V- what I'd want it set to is (V+ - V-) * 1.15, or 34.5V
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