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Old 03-22-2020, 07:19 PM
Cecil McKenzie Cecil McKenzie is offline
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replacing MDR with SSR

Since my shows have been cancelled or postponed i am planning on using a small Denver furnace to fill small orders. I have been having reliability issues with MDRs sometimes failing off and worse sometimes failing on. Considering changing my MDR with a solid state relay.

Interested in whether anyone has done this and what experience they have had. Is it a simple operation and has it worked well? A Watlow representative has suggested a din na mite relay. Thank you for any input. Hunkering down in Kansas.
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Old 03-22-2020, 07:37 PM
Rick Wilton Rick Wilton is online now
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don't buy the really cheap ssr's from Amazon. They will melt down, they are NOT designed for anything close to their stated ratings. I thought I was saving some good money buying "direct from a manufacturer" and quickly (3 months) found out they were crap and dangerous.
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Old 03-22-2020, 07:49 PM
Cecil McKenzie Cecil McKenzie is offline
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Thanks i was thinking about Watlow equipment.
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Old 03-22-2020, 10:06 PM
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Sky Campbell Sky Campbell is offline
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Ive never seen a mdr fail in the on position. Knowing how they work you would understand how thatís impossible unless you lay it on its side or hold it upside down. I donít think you can find anyone that would consider a ssr to be more reliable then a mdr. Maybe someone will prove me wrong but I highly doubt it.

That said I would use mdr relays for my positive cutoff and a scr to control my power. The scr if tuned correctly (reducing the gain, using soft start and only delivering as much power needed) can possibly double the life of wire elements.
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Old 03-23-2020, 07:17 AM
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Pete VanderLaan Pete VanderLaan is offline
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I've never seen an MDR fail at "On" either but I have seen them fail in that they shut down in the on position and close, never achieving the temperature needed for the program. It's the solenoid that gave the trouble, not the mercury portion.

Mechanical relays indeed will fail at on.

Safety issues on an MDR would not keep me up at night.
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Old 03-23-2020, 08:35 AM
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Din-a-mites are great- there are always a ton of them on ebay - You need to have the correct dc milivolt signal available from your controller though.
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