| Electronics > Projects, Designs, and Technical Stuff |
| 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 --- End quote --- 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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