Help with phasing transformers

Do you have the commons or U posts tied together?

Tie the commons on each transformer together (that's what the outside rail does) and try the test again.

I'd start with the  2 CW80s, get them phased and then add the PW ZW...  Good luck.

The CW's should be phased together due to their polarized plugs.  Might be worth while just for the test results to carry over to the phasing of one of the CWs to the ZW.

I hope both of the CWs are of the same vintage/type.  Check the numbers on the base.

Have you used the "SEARCH" tab at the top of every page? There have been several very good tutorials recently about the procedure for phasing.

A digital meter is the proper test instrument for this task. A light bulb is not.

Ok, I was thinking very good.  I never connected the one ground to the terminal.  So, they weren't connected at all.  Once I connected that, the bulb lit brightly telling me they weren't in phase.  I reversed the ZW plug and the bulb doesn't light now.  Thanks for all the replies!  Can't believe I couldn't figure that one out myself!

Arthur P. Bloom posted:

Have you used the "SEARCH" tab at the top of every page? There have been several very good tutorials recently about the procedure for phasing.

A digital meter is the proper test instrument for this task. A light bulb is not.

 

Mr. Bloom Sir,

You are so right.... Do it right the first time, You Betcha!

Dale Manquen posted:

I hope both of the CWs are of the same vintage/type.  Check the numbers on the base.

This is important, as Dale has very nicely outlined on his site, the polarity of the output of the CW80 was reversed in earlier models.  The first generation of CW80 were phased backwards from most other transformers with polarized outlet plugs, but those made after 2006( I think?) matched polarity with standard convention.  

JGL

It's more an issue of determining your common connections first.

The CW phasing was not an issue, but which connection/binding posts were to be used as common, early CW's have the red posts common(A & B), later units have the black posts common(U & U).  I never did check the phasing between examples of the two versions... this still has to be checked in the normal fashion for your use.

ADCX Rob posted:

It's more an issue of determining your common connections first.

The CW phasing was not an issue, but which connection/binding posts were to be used as common, early CW's have the red posts common(A & B), later units have the black posts common(U & U).  I never did check the phasing between examples of the two versions... this still has to be checked in the normal fashion for your use.

It mattered if you want the whistle button to blow the whistle and not ring the bell.  So you do have an issue with mixing CW with different common.   G