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Joined: Jul 2004
Posts: 9,928 Likes: 34
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IBM got in trouble with these SSRs on the 3890s because they are designed to switch on a zero crossing but 3p L/L is never zero.
They settled on the Optos at about 10x the required rating (3/4hp motor on a 45a, little shaded pole motors on 10s)
They did OK. The Crydoms seemed to fail more
Greg Fretwell
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Joined: Sep 2005
Posts: 421
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Joe ,or Greg, I finally picked up two Crouzet #GN 84134011 relays/like this one, http://www.galco.com/scripts/cgiip.exe/wa/wcat/itemdtl.r?listtype=Catalog&pnum=84134011-CROUthere is no schematic but it looks like the switched load connects to terminals 1/L1 and 2/T1 and the control to 3/A1 and 4/A2... I did not see any heatsinks for this relay in the Newark catalog , but it seems I need them since one of these will be pulling 21 A...so I looked at Joes' link and think I can figure out which one to use, but I still can't find them anywhere
Tom
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Joined: Jul 2004
Posts: 9,928 Likes: 34
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I am torture testing a Opto22 in my garage on my air compressor as we speak 15a @ 120v.
I just put it in a 4x4 deep box with heat sink goo under it. I used one of those where the KOs are flush so I get good contact. It gets the box warm but I can hold my hand on it. I did space the box 1/4" off the concrete wall so the air gets behind it.
You can cut a regular LV separator so it fits over the SSR between the 120v side and the LV if you want to use the class 2 rules
Greg Fretwell
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Joined: Sep 2005
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OK, I have everything in an 10X12 NM Hoffman type enclosure on a backplane .
that might be enough metal but I still need to know if my guess at wiring the terminals is right
Tom
Tom
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Joined: Nov 2005
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http://www.galco.com/techdoc/crou/gn/gnssr_spec.pdfTom, This is on the link you sent. Click on the specifications link after you click on the first documentation link. Page 1-12 shows that you are correct on your terminal assignments and the derating curves are on the bottom right of the same page. Newark showed at least 3 Wakefield half brick heat sinks of varying fin depths that the SSR could bolt onto. Just remember that something as simple as keeping the fins vertical can improve convective cooling. Good luck, Joe
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Joined: Sep 2005
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EUREKA.. the thing worked. we will find out tomorrow if if held !
Tom
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Posts: 44
Joined: July 2013
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