That is certainly a good theory. I think a scope would be a nice addition to
the schack
Sent from Mail for Windows 10
From: David G4FTC
Sent: den 10 januari 2019 14:54
To: amps@contesting.com
Subject: Re: [Amps] SSR in amp PS not working as expected
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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