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Making a triac phase control circuit - are my values correct?
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ExtraThiccBoi:
wdym switched? The 240V rail comes from a main 3 phase 400V transformer somewhere
tautech:

--- Quote from: ExtraThiccBoi on March 05, 2020, 07:51:39 am ---wdym switched? The 240V rail comes from a main 3 phase 400V transformer somewhere

--- End quote ---
OK, so it's ON 24/365 ?
ExtraThiccBoi:
nono, it's turned on when it's needed, like let's say works for 10hrs of foam spraying, then switched off
tautech:

--- Quote from: ExtraThiccBoi on March 05, 2020, 08:02:29 am ---nono, it's turned on when it's needed, like let's say works for 10hrs of foam spraying, then switched off

--- End quote ---
OK, good. No further special requirements other than checking and/or replacing the snubber and installing a new Triac of very similar spec to the original.

I don't particularly like these simple Triac control circuits but if everything is right them seem to give reasonable service whereas I prefer a Triac driver/phase control IC but for your case the additional component count may not be suitable as a replacement.
Zero999:

--- Quote from: ExtraThiccBoi on March 05, 2020, 06:13:53 am ---You can see here. The secondary drives heaters.
In one of our machines, this triac circuit keeps failing. I had no idea why could it keep failing, but now I think it's possible the snubber network failed. I think it's a separate component, like a giant blue dipped mica cap, so i could replace it or just trash it and use the snubber in the phase control design suggested by floobydust

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If all you're doing is controlling heaters, then it's quite likely you don't need phase control. Burst control will be much easier on the TRIAC, but the control circuitry is a bit more complex.
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