[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

RE: [TCML] 400 hz variacs

> I have a bunch of 208v 1.3 amp and some larger variacs, all 400 hz. Can 
> these be used as variacs at derated in voltage on 60 hz or are 
> they just good for ballast?


You have to derate the applied voltage by the ratio of the frequencies.

As:

60 Hz / 400 Hz = 0.15

208 V * 0.15 = 31.2 Volts @ 60 Hz


73,

Ralph  W5JGV - WD2XSH/7
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla