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Old 4th October 2005, 02:40 PM   #1
lhgin is offline lhgin  Malaysia
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Join Date: Jun 2003
Location: Penang
Default Topaz Isolation transformer question...

Hi guys,

I've just got a Topaz Isolation Transformer, model 91001-11. It's capable of handling 240V/120V input and also output.

I can successfully connect it in US with no problems at all. When I brought it back to Malaysia, which is 240V, I'm having difficulties to get it to work. The unit is originally wired for 110V operation. How should I wire the primary and secondary to get it to work in 240V?

Please help.

Many thanks!
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Old 4th October 2005, 03:52 PM   #2
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You have four 115V windings on this transformer, two each for primary and secondary.
You must wire the 2 primary windings in series, the same for the 2 secondary windings (if You want to have 240V in as well out).
The picture below is the 230V/240V wiring scheme for a Topaz transformer.
I`m not 100% sure if the number notations for the winding end points are the same on Your transformer but IŽd rather suspect so.
Hope it helps.
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Old 4th October 2005, 04:20 PM   #3
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BTW:
did You unscrew those aluminium "faceplates" yet (behind which are located the screw terminals for the windings)?
If I remember okay there should be an adhesive tag on the inside of one (or both?) of this plates showing a wiring scheme and notations for the screw terminals, just like something as in the picture above.
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Old 5th October 2005, 04:25 AM   #4
lhgin is offline lhgin  Malaysia
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Thanks Cocolino for the help!

I opened it up and saw the windings. I'll try the windings as stated in your post.
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