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Old 13th Jul 2019, 6:29 pm   #1
Sparky67
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Default Coutant E7015 PSU Circuit

Hi All,

Does anyone have a cct for the Coutant E7015 PSU, or any service information on any other PSU in the same series please? This is an analogue nominal 12V / 15A unit.

Many thanks,

Martin
G4NCE
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Old 21st Jul 2019, 12:28 am   #2
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Default Re: Coutant E7015 PSU Circuit

I can't be certain which series yours belongs to, but I see it has one 2N3055. If the regulator uses a single op-amp, type uA723 it probably is from the GPE Series. Here are a couple of extracts from the little handbook.
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Old 21st Jul 2019, 8:24 pm   #3
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Default Re: Coutant E7015 PSU Circuit

Thanks Julian. Apologies - my photo was intended to be of the maker's label and didn't show the pass transistor end of the box. That end is attached below, if it helps anyone identify the unit.

I am really interested in what the 'X' and 'Y' terminals on the connection tagstrip are for. My intention is to series two of these to give me 24V for testing a PRC47 and would like to know if they are involved in operating two of these in series.

Thanks again.

Martin
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Old 22nd Jul 2019, 3:29 pm   #4
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Default Re: Coutant E7015 PSU Circuit

They can be connected in series - see the manual p2
I'm not seeing terminals X and Y, all my Coutants have + and - sense terminals and P for parallel connection (see manual)
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Old 25th Jul 2019, 8:16 pm   #5
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Default Re: Coutant E7015 PSU Circuit

This PSU has the + and - sense terminals, plus an X and Y terminal. I would be very interested to know what they are for. Any ideas?

Martin
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Old 25th Jul 2019, 10:59 pm   #6
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Default Re: Coutant E7015 PSU Circuit

Ah yes, clear now. Sorry I can't help
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Old 26th Jul 2019, 7:01 pm   #7
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Default Re: Coutant E7015 PSU Circuit

Telford shows as having a few Coutant Lambda PSU related manuals - http://www.telford-electronics.co.uk/manual.php?alpha=c Looking for Lamda rather than Coutant may give you a lead.

Andy.
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Old 29th Jul 2019, 5:13 pm   #8
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Default Re: Coutant E7015 PSU Circuit

Thanks Andy. I will have a look.

Still being curious I dropped an email to TDK-Lambda, as they are now, and even their engineers were stumped. The thought is these PSUs were a special build for someone and the X Y facility was used with an option which is now lost in the mists of time.

When my ‘to-do’ list is a bit shorter I may look through the wiring looms, however as they are working OK as they are my curiosity will have to stay at the curious level for now.

Cheers,

Martin
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Old 29th Jul 2019, 6:38 pm   #9
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Default Re: Coutant E7015 PSU Circuit

I do seem to remember that at least one Coutant linear power supply had a connection to the base of the series-pass transistors. The idea was, you could connect two power supplies in parallel, and by connecting all the bases together, they would share the load equally.

The actual output voltage would be set according to whichever power supply was adjusted highest (or lowest) according to the circuit details. What happened in current limit would have been interesting, but I am sure this was taken care of.

That may account for terminal 'X' - I'm still scratching my head about 'Y'!
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Old 29th Jul 2019, 7:39 pm   #10
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Default Re: Coutant E7015 PSU Circuit

One of those terminals could be a remote on/off. I have seen similar PSUs with such a facility.

Al
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