Step up/down transformer help needed [RE-wrenches]

[allan at positivenergy.com]

Don is right.  The Photron only works with generators with no internal 
bond, and I got this from Larry Jennings some years ago.  He recommended a 
standard stepdown transformer from Grainger for an application where 
someone could inadvertently hook up a portable generator to this unit.
Allan at Pos E
> 
> 
> In a message dated 01/01/2001 6:34:20 PM Pacific Standard Time, 
> creuter at rocketmail.com writes:
> 
> 
> > I have an old 4000 watt T-former that Photron put out and it was 
installed 
> > with a Trace 4024 to provide 220volts for a well pump until I ended up 
> > stacking inverters. I now wish to use it  off the 220v out put from a 
Honda 
> > generator to do a step-down before it feeds a single inverter. The 
original 
> > step up was a simple install in which the t-former had a common in-out 
> > neutral and a 110v hot input and a single 220v output( 3-wire 
autoformer) 
> > But to go the other direction how the heck do I wire it? If one wire is 
> > neutral and one is input and the other output how am I tying to the 
plug 
> > off the genny? I dont have any literature except a info sheet that said 
it 
> > can work either way  and as some of you know Photron  went belly up and 
I 
> > believe Lawrence Jennings was exiled to Siberia or some such fate. 
Carl  
> > Reuter
> > 
> > 
> 
> There is a problem here. I'm not real comfortable with this but one way 
> around this is to isolate the genset neutral. One side the xfrm output 
will 
> be the neutral on the 120 side. On second thought, I think this is a bad 
> idea. There is potential for serious trouble- for instance on many gennys 
the 
> neut is internally bonded to ground. I recall grapling with this with 
another 
> Photron auto former. 
> 
> Don
> 
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