Multi Tap Transformer wiring Question

[mneary]

I assume that you need a lot of current at 60V. How much current do you need at 12V?

 

[ericgibbs]

RCinFLA is correct. With a tapped winding that you have, all of the other suggested configurations are wrong. You have confirmed this with explosions and smoke.

You have two choices:

2) Continue to call your 0V terminal "0V". Develop each of the two necessary voltages with a half wave rectifier (single diode) and capacitor. This isn't a good idea at the current levels involved.

In either case, you should use properly rated diodes. 1N4007s are only good for about 1A. You should consider 25A bridges for 10A; if your co-workers or local merchant don't know some, come back and we'll try to help.

hi,
This halfwave suggestion was made earlier.

Looking at the overall dimensions and the wire gauge I dont believe that this transformer is rated for 10A at 60V..

The reason for the cap blowing up IMO, was because the OP was using 1A diodes in a 10A application and I suspect the 1N4007 went short circuit and applied 60V ac across the cap.

EDIT: just seen your edit.

 

[mneary]

It does seem to be a pretty small transformer for 600VA.

 

[ericgibbs]

It does seem to be a pretty small transformer for 600VA.

Especially when the end winding is 110V.!

Makes it about 1KVA, I suspect the lower voltage winding of 12V~ is 10A and the higher taps are much less in current rating.

 

[EmmKay]

an Update..

The solution was simple... infact too simple. I checked the transformer and it had indepenadnt windings which were connected in series to give the desired voltages.

I seperated the 0-12 coil and thus created another 0 for the 0-98 winding..
Now I have a transformer that has two seperate secondary windings 0-12 and 0-98 with 0-98 being multi tapped. giving me 58 instead of 60V which is perfectly acceptable.

I tried joining the common for both supplies after rectification and filtering and it worked well. and it gave me two supplies with a common ground!..

Thank You for all your kind help and patience witha noob like me..

Cheers all.

 

[mneary]

I'm glad it worked out.

 

[EmmKay]

Just out of curosity, how big would a 110V 20A transformer be. becuase the transformer on our Haas CNC mill is rated at 80V 60Amps C. Duty and is only about a 1.25 inches larger in height width and depth from this transformer..!

I thought that due to the aluminum winding this transformer was large in comparision to coppwer winding based transformers.

Anyhow.. thank you again for all your help.