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Maximizing Lifecycle & Performance of Optically Isolated Relays

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a.saji
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Silver
Re: optically isolated relays.
a.saji   6/29/2013 10:25:01 AM
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@William: Oh ok. Thank you for clarifying it. I had a few issues so I was wondering whether you had the same. 

William K.
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Platinum
Re: optically isolated relays.
William K.   5/31/2013 3:33:53 PM
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I did not regard any of the situations that I encountered using optical isolated relays as a drawback. They never gave me any problems, with one small exception. A solid state relay that controlled s solenoid valve had one of it's twi anti-parallel SCR devices fail open. So the indicator light would show that the output was active but the valve would not shift. Once I realized that the bulb was at reduced intensity the replacement effort quickly solved the problem.

a.saji
User Rank
Silver
Re: optically isolated relays.
a.saji   5/31/2013 1:17:22 AM
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@William: Yes true there will be some drawbacks but you cannot expect any without drawbacks for sure. Everything has two sides and so as this.

William K.
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Platinum
optically isolated relays.
William K.   5/30/2013 3:51:15 PM
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My primary use of the opto-isolated relays has been as a computer interface in industrical test systems. 100,000 hours of on time before a 3% reduction in illumination, and the associated increase in turn-on time would be no problem, since the production lifetime of the product tested may not be that long. And for those very long-life products another few milliseconds of response time would not be a problem either.

The other use of opto-relays is for on-off cycling of heaters in temperature controlled systems, where electrical heater powr is cycled to control temperature. For those applications with the zero-crossing switching the problem is even less likely to be noticed or to cause problems. It might possibly have some effect in motion control systems,but that is a different realm completely.

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