Tucson, Az
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Arduino rocks
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« on: December 14, 2010, 05:51:59 pm » |
Just got 36 25A solid state relays on ebay for $74. Great deal. Merry Christmas to me.  Now what to do with them? :-/ |
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Left Coast, CA (USA)
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Measurement changes behavior
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« Reply #1 on: December 14, 2010, 06:04:42 pm » |
Nice price. Keep in mind to utilize the maximum 25 amp current rating requires quite the heatsink, that's why they have smooth metal backings.
Lefty
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Port Angeles, Wa
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Ultimate DIY: Arduino
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« Reply #2 on: December 14, 2010, 08:07:53 pm » |
Really! During a stress test of my 2000F Degree Kiln, I managed to produce an amazing amount if heat in the SSR while tuning PID parameters. (all within spec... but right to the SSR limit) Yes, I had a large heat sink. It was HOT.
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Phoenix, Arizona USA
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Where's the beer?
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« Reply #3 on: December 14, 2010, 08:39:49 pm » |
Just got 36 25A solid state relays on ebay for $74. Great deal. Merry Christmas to me. Now what to do with them? Heh - I'm kinda in the same boat; a couple of weekends ago I went to a local hamfest and bought a large heatsink with 16 25A SSRs mounted on them (each with a varistor across the outputs) in a 4x4 pattern. Got it for $35.00; have no clue what I'll do with them (but I couldn't pass up the deal!)... ;D |
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Left Coast, CA (USA)
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Measurement changes behavior
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« Reply #4 on: December 14, 2010, 09:05:28 pm » |
DIY nuclear reactor?
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Vejen, Denmark
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RAWR! ^,..,^
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« Reply #5 on: December 15, 2010, 02:56:37 am » |
To power lasers!
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Tucson, Az
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Arduino rocks
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« Reply #6 on: December 15, 2010, 03:15:01 pm » |
A nuclear reactor to power lasers. I like it!!!! Now where did I put that plutonium?
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Left Coast, CA (USA)
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Measurement changes behavior
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« Reply #7 on: December 15, 2010, 06:34:46 pm » |
I would surely like to find some that did NOT have automatic zero-crossing switching. Well all scr/triac based SSR are going to be zero-crossing switching from on to off state as that is the only way to turn off a triggered and conducting scr. However the the turn-on can be either random or zero based I guess on the design of the triggering circuit of the device. Not sure if it is always clearly stated in many SSR datasheets or not what the turn-on charactristic are of the device. I would assume that lots of high power random switching would generate a lot of harmonic garbage in the local power wiring? Lefty |
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« Last Edit: December 15, 2010, 06:36:05 pm by retrolefty »
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0
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bluesmokelabs.com
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« Reply #8 on: December 16, 2010, 11:24:30 am » |
The flat metal on SSRs, is it just for heatsinks and is it usually isolated. Got a plug socket to modify  |
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Left Coast, CA (USA)
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Measurement changes behavior
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« Reply #9 on: December 16, 2010, 01:25:14 pm » |
The flat metal on SSRs, is it just for heatsinks and is it usually isolated. Yes to both. Use heatsink paste for best results. |
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« Last Edit: December 16, 2010, 01:25:35 pm by retrolefty »
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California
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One man with the truth is a majority.
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« Reply #10 on: December 16, 2010, 08:15:43 pm » |
But the 0.1% of us wanting to do phase-angle dimming need the kind WITHOUT the zero-crossing circuitry. Is this what you are looking for?: http://www.alliedelec.com/search/productdetail.aspx?SKU=6820149I am interested in making a phase-angle controller for a split-phase motor, so I would like to know more about this. |
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