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Re: [Amps] SSR in amp PS not working as expected

To: "amps@contesting.com" <amps@contesting.com>
Subject: Re: [Amps] SSR in amp PS not working as expected
From: David G4FTC <g4ftc@hotmail.com>
Date: Wed, 9 Jan 2019 18:16:22 +0000
List-post: <mailto:amps@contesting.com>
Hi All,

Having been caught on more than one occasion with fakes, particularly fake SD 
memory cards, I now only buy semiconductor components from reputable sources - 
more costly, yes, but you are guaranteed a known product fully traceable to the 
manufacturer.

Coming back to the Ulf's SSR problem, I noted the reports of the transformer 
humming loudly - my first thought was that the SSR was acting like a diode - 
only half the a.c. waveform was being fed to the transformer. Replacing the 
transformer with a resistor and observing the waveform with a scope would 
confirm or deny that prognosis.

David G4FTC
________________________________
From: Manfred Mornhinweg <manfred@ludens.cl>
Sent: 09 January 2019 15:22
To: Ulf Tjerneld; g4ftc@hotmail.com
Cc: amps@contesting.com
Subject: Re: [Amps] SSR in amp PS not working as expected

Ulf, David,

> I did a google search for the Crydom CSD2525P SSR but I can't find
> any datasheet - could it be a "special" for some particular
> application and is incompatible with what you are trying to do?

Indeed - I couldn't find a datasheet either! The closest seems to be the
CSW2425, which is a snubberless, zero-crossing triggering, antiparallel
SCR SSR. Snubberless is definitely not the right kind to use here, and
zero-crossing triggering also leads to more trouble than advantages when
controlling transformers.

But that's for the CSW2425, not what you have...

Ulf, maybe you got a Chinese "eBay special" devices - which means fakes!
  In that case nobody can tell what's really inside your little black
boxes. There are quite a few crooks in China re-labeling ultra cheap or
defective parts to look like more expensive, famous-branded ones. But
the practice seems to be getting less common. Lately almost all parts I
have ordered from China were real. Emphasis on "almost".

Manfred


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