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Re: [TCML] Variac
having the wiper somewhat in the middle of the windings seems to reduce
the initial magnetic flux thru the core of the variac. Depending on how
you have the Variac wired for output, it can be a healthy inital surge.
If wired for say line voltage in and line voltage out at max rating, the
surge is almost minimal when starting( turning on) the variac at full
voltage since the wiper is at the end of the windings with little
magnetic field flux being produced. If you have it wired for 120 in and
140 out at max settings, there is going to be the inital magnetic flux
incurred to give you the 140 V out.
The unit is rated for 22.5 amps current capacity, in other words it will
handle a current of 22.5 amps max thru it to the load it is supplying.
If you were to put a load on the variac that can draw more than 23 amps,
the Variac will overheat and smoke and eventually die... most of the
times, variac failure occurs where the wiper ( brush) is in contact with
the windings, either the brush arcs out or the windings melt and break.
Just wondering.... how do you have the variac wired up???? Did it come
with a prewired wall plug attached, or did you have to put one on yourself?
What brand is the Variac??
Ok this is attempt 3 my e-mail keeps saying that there was a sending error. so if 3 of the same message were in fact sent i am sorry.
Ok so i think that this so called surge is the culprit since at the time of the breaker being blown I was trying to figure out where a weird sound was coming from and this entailed turing it on and off. learing from my mistakes i won't be doing that again... ever...
How much current is the norm if nothing is plugged into it? If the unit is rated for 22.5 amps why is it not pulling that much power all the time?
How does starting the variac with it turned up help. I understand what you want me to do but I am curious as to why it works.
Even if the surge current was the culprit i want to be sure before I plug it back in and the people start asking why stuff blew.
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