How connect this transformer's primary side.

[Ken Boyd]

Thanks for any help with this task, not quite sure how this gets terminated.

Was leaning towards wht as the neutral and blk as the line and then terminating the gray with the blk/Wht. But another way it might be looked at as joining the wht with the blk/wht together on the neutral and terminat the gry with the blk with the line. Sn idea?o anyone have an idea?




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[ConradH]

For 120 VAC, use WHT+BLK/WHT and GRY+BLK. It doesn't matter which way they connect to line. 240 VAC connects GRY+BLK/WHT with power to the WHT and BLK. Again, no difference in the way they connect to the line. Usual caveat- double check with somebody in their right mind.

 

[Buck Rogers]

Yup...

Connect the two "Red" dots together that's one side of the 120V.

Connect Gray and Black together that's the other side of the 120V.

PS: If you touch the Reds while the transformer is energized you will have a very bad time...

Take your time, Double check and write lots of notes and take lots of pictures...

Good luck.

 

[tubeactive]

The two primaries in parallel are for 120VAC.
In series, they are, of course, for 240VAC in.

Ken, Polarity is not critical...but your instincts are good. The "neutral" are the white and black/white. The positive "line" are the black and gray leads.

 

[Ken Boyd]

Came across this at a very reasonable price and it seemed like it had potential for being useful, so I snagged it. Nothing off hand in mind but never know when I might want to use it. The seller said it was for a Cary amp, but no model is tagged but listed it as new and warranted it as good, so prior to leaving feedback and re-boxing it thought I would power it up and test the secondaries. Will be careful with for sure as the drawing says 700 volts on the red wires, although some handwritten notes are conflicting, so I want to verify the actual output. will fuse the line power on the primary and use clips on the secondaries to be safe.

looking at the bolt holes looks like it has been bolted down to me.

 

[wdecho]

Came across this at a very reasonable price and it seemed like it had potential for being useful, so I snagged it. Nothing off hand in mind but never know when I might want to use it. The seller said it was for a Cary amp, but no model is tagged but listed it as new and warranted it as good, so prior to leaving feedback and re-boxing it thought I would power it up and test the secondaries. Will be careful with for sure as the drawing says 700 volts on the red wires, although some handwritten notes are conflicting, so I want to verify the actual output. will fuse the line power on the primary and use clips on the secondaries to be safe.

Just use a variac and check voltages at a reduced level just to check voltages on specified wires. Put black tap on the wires you are not testing. That's the safer way to check a transformer. You can use common sense with V's in vs V's out to determine if you will have the correct voltages or use math.

 

[Ken Boyd]

Just put wire nuts on each lead used the variac but I did run it up to 120 to get actual voltages, a little over 700 volt on the Reds, 13 volts one the browns 6.4 on the grn, 77 on the blue.

This company closed from what I read about 6 years ago.

 

[wdecho]

You have a very nice transformer depending on what you paid. I forgot one also should also use a dim bulb between variac and transformer just to be safe.

 

[gadget73]

Just use a variac and check voltages at a reduced level just to check voltages on specified wires. Put black tap on the wires you are not testing. That's the safer way to check a transformer. You can use common sense with V's in vs V's out to determine if you will have the correct voltages or use math.

This. I set it to 12 volts s I don't have to do any real math. Output is close enough to 10% of full voltage that it works out.

 

[Ken Boyd]

This. I set it to 12 volts s I don't have to do any real math. Output is close enough to 10% of full voltage that it works out.

That is a good idea. I hooked it up and had caps on all the leads other than the ones I was testing. I would clip on my test leads and then slowly bring up the voltage and watch the meter as it climbed. I test hi voltage stuff all the time at work so I am careful, most everything we have is 460 three phase.

This seems like a nice transformer, not sure what the 70 volt taps are for but they measured 77 volts at 120 volts input.

 

[Ken Boyd]

You have a very nice transformer depending on what you paid. I forgot one also should also use a dim bulb between variac and transformer just to be safe.

I have one, but I didn't use it, I just wired the primary to a pigtail with an IEC connector that is fused. I used a 3 amp fuse. I adopted a new policy all pigtails and service leads must be fused from now on.

 

[gadget73]

not sure what the 70 volt taps are for but they measured 77 volts at 120 volts input.

bias supply probably, especially if they are taps on the HV winding, and the HV winding is set up for a grounded center tap arrangement.