Topaz Isolation transformer question...

lhgin · 4th October 2005, 02:40 PM

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!

cocolino · 4th October 2005, 03:52 PM

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 I´d rather suspect so.
Hope it helps.

cocolino · 4th October 2005, 04:20 PM

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.

lhgin · 5th October 2005, 04:25 AM

Thanks Cocolino for the help!

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

4th October 2005, 02:40 PM	#1
lhgin diyAudio Member Join Date: Jun 2003 Location: Penang	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!

4th October 2005, 04:20 PM	#3
cocolino diyAudio Member Join Date: May 2002 Location: Bavaria (south of veal sausage equator)	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. __________________ Christoph *STEAL the BEST - INVENT the REST*

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Isolation Transformer Question	Captn Dave	Tubes / Valves	6	28th April 2009 03:30 PM
Isolation Transformer question	Jack Torrance	Power Supplies	7	2nd January 2007 08:37 AM
Topaz 5kVA Isolation Transformer	ampsarus	Swap Meet	1	7th November 2005 07:00 AM
Topaz Isolation Tranny	lpd	Tubes / Valves	3	14th June 2004 02:29 AM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

5th October 2005, 04:25 AM	#4
lhgin diyAudio Member Join Date: Jun 2003 Location: Penang	Thanks Cocolino for the help! I opened it up and saw the windings. I'll try the windings as stated in your post.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)