19 Mar
2011
19 Mar
'11
4:49 a.m.
On Sat, 19 Mar 2011 02:46:58 -0700
Eric Smith <eric at brouhaha.com> wrote:
Check the power plug or cable. If the equipment has a
neutral (not
ground!) lead, it needs wye. Otherwise it needs delta.
No. If you have a
symetrical load like a motor you can wire it Y
without connecting neutral. So the presence of netral is no indication
of Y or D. Y or D depends on the voltage the equipment needs per "leg"
and the voltage the grid delivers. Remember voltage phase to phase is
sqrt(3) times voltage phase to neutral.
If the equipment contains any three-phase synchronous
motors, you have
to get the phases in the right sequence; if they are reversed, the
motors run backwards.
This applies to asynchronous motors in the same way.
--
\end{Jochen}
\ref{http://www.unixag-kl.fh-kl.de/~jkunz/}