3 phase survey

?

I have 50 and 30 hp and get 238 238 221 from both they are toshiba E series
idlers and I have no run caps.


Personally if I was you I would add some run capacitors so as to drop that
third leg down and I'd also wire in one  contactor that will positively lock
out the start caps after startup as well as another that removes all power
in the case of brownout and then call it good.

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To re-iterate, that 269vac is too high most cnc equipment these days has
varisters that actuate upon overvoltage in order to protect power supplies
etc.

Very common for a varister to go ( at which point they present a dead short
across the input mains ) so then what happens is either the unit keeps
immediately blowing fuses or else you cant get the supply breaker to stay
reset.

Then you call in a "tech" that doesnt know his ass from a hole in the ground
and ends up you buy a new or rebuilt component for several thou $$$ when all
that was really needed was a $2.00 part that's available over at your
freindly neighborhood radio shack store.

http://images.google.com/images?um=1&hl=en&sa=X&oi=spell&resnum=1&ct=result &
cd=1&q=metal+oxide+varistor


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