Destruction of solid state relays - BMW Luxury Touring Community
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post #1 of 13 Old Jan 22nd, 2019, 10:35 am Thread Starter
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Destruction of solid state relays

What can cause solid state relays to fail?
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post #2 of 13 Old Jan 22nd, 2019, 11:20 am
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Re: Destruction of solid state relays

Heat, over load, over voltage.

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post #3 of 13 Old Jan 22nd, 2019, 11:33 am Thread Starter
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Re: Destruction of solid state relays

Could vibration be a cause as well?
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post #4 of 13 Old Jan 22nd, 2019, 12:08 pm
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Re: Destruction of solid state relays

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Originally Posted by lukebarber View Post
Could vibration be a cause as well?
Normally not unless it was so severe that it was physically damaging some components like jarring loose solder joints. I am guessing you have had trouble with more than one failure. Heat is the biggest enemy of any solid state component. Maybe some background on what you are using and what for. Not an EE but I did stay at a Holiday Inn Express once.

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post #5 of 13 Old Jan 22nd, 2019, 12:56 pm
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Re: Destruction of solid state relays

Without additional details, it is difficult to diagnose the cause. Inappropriate installation, wiring the control circuit to the load or choosing a relay that lacks the capacity for the load to which it is applied??? Most relays I have used are "overbuilt" and ordinarily, you have to work hard to cause them to fail. Somewhere, something is seriously wrong or the relays managed to escape quality control at the manufacturer.

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post #6 of 13 Old Jan 23rd, 2019, 6:36 pm
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Re: Destruction of solid state relays

Just like plane crashes are always the failure to maintain altitude, electronic component always fail because we let the "smoke" out. The smoke is supposed to stay on the inside.
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post #7 of 13 Old Jan 24th, 2019, 7:45 am
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Re: Destruction of solid state relays

2 potential causes that I can think of! First is overloading well beyond the current rating, and the second is reverse polarity with voltage beyond threshold limit! SS relays tends to be sensitive to both of these issues.
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post #8 of 13 Old Jan 24th, 2019, 1:45 pm Thread Starter
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Re: Destruction of solid state relays

I'm testing by using a snubber to prevent over-voltage.
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post #9 of 13 Old Jan 24th, 2019, 1:58 pm
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Re: Destruction of solid state relays

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I'm testing by using a snubber to prevent over-voltage.
OK, so what is your question? We are assuming you are burning up SSR's and don't know why. We still do not have enough information to potentially assist you.

Gordon
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1998 R1100RT – Never should have sold it
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post #10 of 13 Old Jan 24th, 2019, 2:05 pm Thread Starter
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Re: Destruction of solid state relays

I'm sorry. The question that I'm trying to figure out is if there is a way for me to know which part failed, the coil or the contact?
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post #11 of 13 Old Jan 24th, 2019, 2:24 pm
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Re: Destruction of solid state relays

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I'm sorry. The question that I'm trying to figure out is if there is a way for me to know which part failed, the coil or the contact?
You are not talking solid state relays. Coils and contacts are part of mechanical relays. Solid state use semiconductors with no moving parts.

Is this in use on your bike or in some other application?

Gordon
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post #12 of 13 Old Jan 24th, 2019, 2:31 pm
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Re: Destruction of solid state relays

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I'm sorry. The question that I'm trying to figure out is if there is a way for me to know which part failed, the coil or the contact?
A DVM doesn't have enough current to properly test due to the internal circuits on most SSRs.

You can do it load test with a DC (or AC) source. You could probably measure input (control) current - if you get current flow it MAY indicate that the input is OK and that the issue is on the output side - however the control circuit may still draw current, but still have some other internal fault.

If it doesn't work not much can be done to repair it - as others have already said need to make sure it's rated for the application.

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post #13 of 13 Old Jan 24th, 2019, 3:26 pm Thread Starter
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Re: Destruction of solid state relays

Thank you Gino pointing me in the right direction.
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