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Old 14th June 2010, 08:28 PM   #1
Dagwood is offline Dagwood  New Zealand
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Default New Variac

Hi all

I just won this open frame Variac on Ebay, can anyone tell me how to wire this correctly

Variac.JPG

Not mad keen on frying myself

P.S plan on mounting in earthed box with volt meter and in line fuse fitted.

Cheers
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Old 14th June 2010, 09:12 PM   #2
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Hello Dagwood, AC In = pins 2&4, AC Out = 3&4. Other pins are unused for your usual applications.

Peace,

Dave
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Old 14th June 2010, 09:19 PM   #3
Dagwood is offline Dagwood  New Zealand
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Thanks Dave

I will give it a try in the morning.
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Old 14th June 2010, 09:23 PM   #4
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Just remember here that you have high voltages on the Variac and it's terminals (240v) in your case, so keep your fingers out of it when you have it plugged in. I would also suggest that you do a quick check with an Ohmeter to make sure that there aren't any shorts that may cause hazards.


Peace,

Dave
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Old 14th June 2010, 09:40 PM   #5
Dagwood is offline Dagwood  New Zealand
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Hi Dave

Thanks man

Plan to mount it into a case before powering it up ( safety first! ) just in case of any problems???

Good idea, will check for any shorted turns as well.

Cheers
Ben
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Old 14th June 2010, 09:44 PM   #6
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Hello Dagwood, when you mount it in the case, don't forget a fuse or circuit breaker rated at the maximum current that the variac is rated for. If you want to make it really cool, mount volt meter in the same case so that you can monitor the output quickly. That way your DVM is freed up for other measurements!

Peace,

Dave
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Old 14th June 2010, 10:19 PM   #7
Dagwood is offline Dagwood  New Zealand
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Hi Dave
Was just designing front panel in Autocad and thinking the same thing, I like the look of the new blue LCD meters coming out of China ( Ebay again ) but as the Variac has an older style knob and gauge it might look stupid! ??? Think I might look for a retro looking one.

Cheers
Ben
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Old 15th June 2010, 12:54 AM   #8
Enzo is offline Enzo  United States
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My thoughts. Monitoring voltage is real useful, but I rely on a current meter even more, especially when troubleshooting. And I also prefer analog meters for this, since they are a lot easier to see trends on. If my current meter is oozing up versus rocketing to the sky, that tells me something.
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Old 15th June 2010, 02:17 AM   #9
stoc005 is offline stoc005  United States
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Default Alternate wiring option

Input 1 -- 4
Output 3 -- 4
What this does is allow you to have more than the line in voltage on the output. You can compensate for low line conditions or test how you electronics reacts to higher than normal line conditions. Very common configuration.
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Old 15th June 2010, 09:57 AM   #10
Dagwood is offline Dagwood  New Zealand
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Hi Enzo and Stoc005

See your point on the current meter, I may try to fit both as the case I have is large enough. ( every day is a school day )

Have tested on meter, and your wiring configuration is correct Stoc055, other option would have meant blue smoke! lol

Thank you both for your help

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