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A few months ago I saw a wiring diagram on this asylum for this transformer and ordered a pair. Without much delay or fuss they arrived a while later, very well built, substantial units, really pleased. No wiring diagram was included but no worry I had the one I found here. Life being what it is I only just got around to seriously considering their use and discovered that the transformers I have do not have 2 black wires for the primary. Instead there are 2 pairs of wires, black and black/white and brown and brown/white. One winding measures 5.2 ohms and the other 4.7 ohms. I hope that other owners of this transformer can clarify how to attach to 120 volt AC. TIA
Follow Ups:
Operating under the assumption that you have two 120V windings for the primary you can check continuity between the 4 wires and find out which colors are pairs. I would guess that the blacks are a pair and the browns are a pair. Within each pair I would expect the solids are "hot and the "white Stripes" are neutral.
Now, carefully apply 120V to one winding and measure the voltage across the other. If the AC values are similar you can then place the two windings in series and apply 120V from 1 end to the junction (CT if you will) and measure the end to end voltage. If it is in the 230V range then you have found the correct phase and the windings can be reconnected in parallel paying attention to the phase. If the end to end voltage is near 0Vac then the windings are out of phase with each other and one pair needs to be reversed.
a fuse and a variac is always good practice when sniffing out windings but the procedure I outlined shouldn't have any catastrophic failures.
dave
If you don't have a variac, perhaps you have a 6v or 12v transformer in your junk box. Consider hooking the 6v or 12v transformer primary leads up to the 120v mains, and do all your testing with the 6v or 12v outputs as the source for your Heyboer testing. Though you have to do a bit more math, this makes the whole operation a lot safer.
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I think you should call Heyboer tomorrow morning, and ask for Phil, or Arlen, and ask them what the leads represent. They will know for sure !!
Likely, they are dual 120 VAC windings, that should be run in parallel if on 120 VAC or in series if on 240 VAC input / lines. But simply ask Heyboer, and you can be 100% sure !!
I'm sure I will get it cleared up, I have sent them an email. Just looking for instant gratification, wanted to get something done today.
NO email, CALL them tomorrow AM, shows urgency, plus they will WANT to assist you !!!
Jeff Medwin
You're probably correct Jeff, I'll call tomorrow. Thanks.
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