From: "Steve Fitzgerald" <[EMAIL PROTECTED]>
Can I assume that 1 and 2 are input and 3,4
are output?
I would be careful. You don't want to risk connecting it up wrong and
burning out the winding. Most variacs have taps that allow the output to
either go from 0 to full line voltage, or to go from zero to about 20%
above full line voltage. The taps are located near the end of the winding.
Some units have a similar tap on each end of the winding to accomadate the
type of moutning, or if the voltage output increases when it is turned
clockwise or anti-clockwise.
You don't want to accidently apply full line voltage between the end of the
winding and the tap that is near that end. I would measure the resistance
between taps using every combination, and apply initial voltage between the
taps with the highest resistance. Use a 75w light bulb in series with the
110 volt source for the initial test, to limit current in case you
inadvertently hook things up wrong. You should be able to determine which
terminal goes to what tap that way. Don't remove the bulb until you are
absolutely certain you have the taps figured out.
In case you see gibberish below, I tried to draw a diagram. I hope it comes
out the same way as it looks on my screen.
hot here for 0-110v________ (
hot here for 0-140v________(
(<-------- output (variable tap)
(
(
neutral here_________(_________ common
(
(
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