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 Posted: Jan 20, 2012 - 12:50 PM |
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Joined: Sep 04, 2002
Posts: 21257
Location: Orlando Florida
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| I have a 30A DC solid state relay that sources 12V to a 11A motor when it turns on. All of a sudden, its outputting 5V instead of 12V. I think I zapped the SSR. So do I put an RC snubber across the relay or across the load? What values? Thanks! |
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Imagecraft compiler user
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Posted: Jan 20, 2012 - 01:55 PM |
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Joined: Feb 12, 2005
Posts: 16286
Location: Wormshill, England
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First off, you see what the SSR data sheet says.
A motor with 11A run current is likely to have a far greater inrush current or stall current.
I would have thought that the SSR would have its own protection.
If your design is within the ratings, ask for a replacement SSR.
Regarding snubbers. The RC goes across the motor. By inference, a SSR does not have a coil. Hence no inductance !
I am sure that there are official tables for selecting the R and C. Basically you have to absorb the inductive energy when you abruptly change the current. Normally this is when the current switches off rather than on.
David. |
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