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Old 04-30-2014, 03:35 AM   #51
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??? Vey puzzling indeed.
How about when it come to the high temp (about when the GFCI trips) some liquid might have leaked through the element mounting seals into the element connection chamber. It wouldn't take much water to give it a GFCI trip to ground path.

Ok... Ok... I'm grabbing at straws too. But maybe worth a check anyway.

P-J
Yes, i thought that as well. I checked after the first set of trips during my brew day and no moisture in the enclosure. Then i tested the next day with water, tripped the GFCI, and still no moisture...
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Old 04-30-2014, 03:36 AM   #52
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I wonder if that element can handle the fast switching we normally use on the camcos and the like. It might be something as simple as adjusting the on/off timing in the pid. But who knows.
it's set to 2 seconds as of now - i can try to increase that as well
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Old 04-30-2014, 03:45 AM   #53
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Since you say it only happens at boil it makes me think it's happening when the ssr goes from on all the time to suddenly switching on and off. And in duty cycle mode it's more of a pwm type of scenario. What your actually doing is switching on and off so fast that the times on as opposed to off determine the duty cycle 80% means it's on for 80% more cycles than its off. Where with an analog manual control you are actually determining the voltage by resistance so an 80% means that your passing 80% of your potential voltage.

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Old 04-30-2014, 03:55 AM   #54
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But. The GFCI will only trip under 2 conditions:
When there is a power overload beyond the amp range of the breaker (this in not happening).
And when there is a milliamp leakage current from either hot OR the neutral to equipment ground.

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Old 04-30-2014, 04:02 AM   #55
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Since you say it only happens at boil it makes me think it's happening when the ssr goes from on all the time to suddenly switching on and off. And in duty cycle mode it's more of a pwm type of scenario. What your actually doing is switching on and off so fast that the times on as opposed to off determine the duty cycle 80% means it's on for 80% more cycles than its off. Where with an analog manual control you are actually determining the voltage by resistance so an 80% means that your passing 80% of your potential voltage.
Can't be this. In manual mode at 60% it was cycling the same rate from 70 degs up to 200 deg just fine, then trips the breaker as it approaches boiling temp





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Old 04-30-2014, 05:49 PM   #56
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But. The GFCI will only trip under 2 conditions:
When there is a power overload beyond the amp range of the breaker (this in not happening).
And when there is a milliamp leakage current from either hot OR the neutral to equipment ground.
So, any chance the element itself is leaking current to the pot (which is grounded) when the boil is starting?
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Old 04-30-2014, 06:05 PM   #57
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But. The GFCI will only trip under 2 conditions:

When there is a power overload beyond the amp range of the breaker (this in not happening).

And when there is a milliamp leakage current from either hot OR the neutral to equipment ground.

It could under very certain circumstances happen if the spa panel is pulling more voltage over the dryer plug than can be sent back to earth. But I don't think that's the problem. There could be a short in the pid. Even though your not using the alarm function or the relays. It might be something internally that's grounding out. What is your alarms set to. If they are set to go off at 212 or close to it. Try setting them all the way up to 999. That will eliminate one more mechanical device that could be causing issues.
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