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NSS
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Wire Up 220 Volt Variac

01/19/2018 11:44 AM

Hello All,
Need some wiring assistance here,
Trying to wire up a 220 volt variac, I have done dozens of 110 volt versions, and it is simple. It;s is more or less just like a GIANT Potentiometer.
A common ground or "Neutral, and hot on the input and a common or Neutral and sliding tap on the output.

But on 220 input power, UG! ya got this coming in,,

B= Neutral or ground, and two Hots, A & C
Now what would go to where on this multi gang beast here, the manufacturer says it will do as a 220 volt variac,
But how would I wire it up so I get on the output zero to full voltage swing?

Joe
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SolarEagle
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#1

Re: Wire Up 220 Volt Variac

01/19/2018 12:39 PM

http://www.electronics-tutorials.ws/transformer/auto-transformer.html

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NSS
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#2
In reply to #1

Re: Wire Up 220 Volt Variac

01/19/2018 12:50 PM

Yup that explains what I have always known when doing like a 110 volt one.

But the 220 is for some reason baffling me.
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SolarEagle
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#3
In reply to #2

Re: Wire Up 220 Volt Variac

01/19/2018 1:06 PM

https://youtu.be/6sqoZk4W9tU

https://youtu.be/D1jaTevZGWs

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NSS
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#4
In reply to #3

Re: Wire Up 220 Volt Variac

01/19/2018 1:32 PM

Ok those all deal with 110 variacs, I have done dozens of them the 220 is what was blowing me away but i thnk I got it, what ya'll think of this?

Joe
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SolarEagle
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#5
In reply to #4

Re: Wire Up 220 Volt Variac

01/19/2018 1:46 PM

He says in the first video at 3:21 that the wiring is the same for 120 or 240....

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SolarEagle
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#8
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Re: Wire Up 220 Volt Variac

01/19/2018 2:12 PM

Looks like this 3Ø unit to me....

https://www.ebay.com/itm/General-Electric-Volt-Pac-Variable-Transformer-120-520-Volt-30-Amps-w-Motor-/182930486659?_trksid=p2385738.m4383.l4275.c10

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Lo_Volt
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#6
In reply to #4

Re: Wire Up 220 Volt Variac

01/19/2018 1:47 PM

Are you using two 110 volt variacs?
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NSS
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#7
In reply to #6

Re: Wire Up 220 Volt Variac

01/19/2018 2:02 PM

https://www.torontosurplus.com/industrial/transformers-variable-variacs/general-radio-w20g3-genrad-variac-autotransformer-3-gang-w20-single-or-3-phase-see-description.html
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SolarEagle
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#9
In reply to #7

Re: Wire Up 220 Volt Variac

01/19/2018 2:16 PM

Ask the guy for an appropriate wiring diagram....

https://www.torontosurplus.com/productquestion/index/index/product/6020/

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Lo_Volt
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#10
In reply to #7

Re: Wire Up 220 Volt Variac

01/19/2018 2:43 PM

That should work, assuming the wipers are both mechanically connected and they turn in the same direction (i.e. left in the schematic is counter-clockwise and right is clockwise or vice-versa).

You'll have one unused variac out of the gang of three.

Since both inputs are hot, make sure you switch and fuse both of them.
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NSS
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#11
In reply to #10

Re: Wire Up 220 Volt Variac

01/19/2018 3:34 PM

Yup it worked, Yay!
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hoo8975
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#12

Re: Wire Up 220 Volt Variac

02/05/2018 2:13 PM

In your picture (though very clear) I can't read the name plate data. This was a 3 phase unit and I think transformers may EACH have a primary designed for 230 volts. If that is case operating at 120 volt primary you may have less capacity than you think. Example: If each 1 kva, 240 volt you are limited to ~4 amp load at any voltage so if set for 50 volts only 0.2 kva available. If I am correct, and assuming 1kva each, you could wire differently to get 12 amp output.
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hoo8975 (1); Lo_Volt (2); NSS (4); SolarEagle (5)

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