At 10:49 AM 4/22/2004 -0400, you wrote:
>Hi All,
>
>I have done some minor controls of products that have been UL, CSA, CCC
>approved and CE Marked. The controls did not include safety shutdown
>circuits. I was wondering how difficult it would be to have the safety
>shutdown controls on the PIC and get it approved by the agencies. The
>product would be a welding power supply. The safety circuit cuts the bias
>supply and opens a contactor relay.
>The shutdown is caused by excessive output voltage, or over temperature. I
>save some cost by putting this in code instead of analog comparators.
>
>Any shared experiences are appreciated.
>
>Fred

What are the consequences of failure of said subsystems?

"Safety" like a smoked transformer, or safety as in dead bodies and
burned down buildings?

Best regards,

Spehro Pefhany --"it's the network..."            "The Journey is the reward"
speff@interlog.com             Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog  Info for designers:  http://www.speff.com

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