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I am busy putting the finishing design touches on a 3,000L still and am now starting to look at the power controller.
The still is 54KW, 3 phase, 380VAC. There are 6 x 9KW heating elements. The still will be 100% automated where heating output control is 4-20mA to the power controller.
I received my first quote yesterday and the price was scary. It was for a Thyristor control unit.
The quote today was for a fan cooled WATLOW unit model DC32-40S0-0000 and the price was quite reasonable. Now I know WATLOW to be a quality item.
But it got me thinking, ...... what are others using where they accurately control power to the heating elements.
Cheers from sunny SA. Today about 33 deg C.