My wife will retire from her work in a near future, and she´s very interested (and skilled) in pottery. For this reason we have bought a pottery kiln, able to reach temperatures up to 1200 oC. In order to make the kiln appropriate for glass works (with higher demands on the temperature curve) I have…

kajan: Which put stress on the elements. Can you say how / why please, or a link explaining the mechanism.

Boardburner2: I see what you are trying to do , ie spread the cycles out more rather than in bursts. Im not really convinced it makes any difference to the heaters though, the main heater saving feature is the zro volts switching .. Can you say how / why please, or a link explaining the mechanis…

/dev: I would also contact the vendor to confirm that that kind of digital input will make the controller act like you want. Analog = simple DAC code and voltmeter verification Cheers, /dev I actually asked them this today, and will publish their answer here when I get it.

LOL, I finally found what "Two-thirds Control" means in this document: [image] And this document gives a little more info on the switching: [image] Using Zero Volts Switching (ZVS) burst firing, the alternative form of triggering, gives interference free AC power control. This circuit inhibits …

Regarding on-off-control - the heating elements take more stress with on-off control. I want to prevent the aging of the elements. Kanthal is not cheap. That's not all that convincing. They are accustomed to being turned on and off 120 times a second, already.

This is state of art at the moment: [Fysisk skiss.jpg]

michinyon: They are accustomed to being turned on and off 120 times a second, already. I've probably misunderstood what "burst firing" is. I'll try to explain how I think: You want to rise the furnace temperature by 10. This will take you 3 minutes with full power, then off. This was burst firin…

michinyon: That's not all that convincing. They are accustomed to being turned on and off 120 times a second, already. Yes, they are "turned on and off 120 times a second", but that's not related to heating nor to stress. It's the change in temperature over time (dTemp/dTime) that determines th…

Burst firing traditionally relates to the use of zero volt switching to turn on in bursts of 1 cycle or more It could bean a burst of one cycle or 10000 cycles. With the right switching arrangement this can also mean bursts of half cycles as a half cycle starts and finishes with a zero crossing T…

/dev: It's the change in temperature over time (dTemp/dTime) that determines the stress on the elements. Cheers, /dev That is the key point. I had never thought it was a problem though with heater coils except at failure when a tired element suddenly undergoes localised heating and pops. I u…

Temperature regulation in pottery kiln with 3 phase 400V

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kajan February 10, 2015, 8:18am 39

This is state of art at the moment:

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Temperature regulation in pottery kiln with 3 phase 400V

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