120 -240 control XFMR [RE-wrenches]

[Drake Chamberlin]

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I called Jefferson Electric, one of the suppliers of control current 
120/240 VAC transformers, to get more information on why they can't be run 
backwards.  Their number is 800-892-3755.  I talked to Janice.

She said the small transformers are "compensation wound."  They will begin 
at 10% to 15% under voltage and the voltage will drop continually as the 
unit operates.  She could find no information concerning why the voltage 
continues to drop.  We speculated that they might heat up, but that is just 
speculation.

Additionally, the warranty will be voided if the unit is operated 
backwards.  The smallest units they have that can be run bidirectionally 
are 2 KVA.

I'd previously contacted ACME Transformer (800-334-5214), and they had also 
told me their control current units could not be run backwards.

I'm going to take a different approach for the control issue at hand.

-Drake 

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