On Mon, 26 Apr 2010 19:24:23 +0000 (UTC), David Lesher
wrote:


So I got roped into an interesting project, a log cabin in
Califunny. It will have a small (80,000 gallon indoor) pool,
20KW of PV solar array, and lots of other complications.

We're doing everything in 208/3ph [but actually take a PG&E feed
at 4160vac]. This makes things both easier & interesting.

To meet fire regulations, there will be 10,000 gal of potable
water storage and one pump that feeds both domestic users and
the NFPA 13D sprinklers. The code requires one pump so that the
owners don't just neglect the sprinker pump.

They use a VFD drive to meet the varying needs of one faucet or
a dozen sprinker heads. But thus far, I can't find a system that
put in the added diodes to run from 3 phase... Argh.

Anyone seen a VFD-driven firepump that takes 208/3ph in?


Any 3phase firepump will work on a VFD at the proper voltage.

Now..finding a fire pump that has a 3 phase motor on it...thats
something I know idea about. Or removing the single phase motor and
putting on a replacement 3ph.

Put a 3 minute timer to the fire alarm, a loud warning indicator and
then have it automatically turn on the VFD. G

Gunner


"First Law of Leftist Debate
The more you present a leftist with factual evidence
that is counter to his preconceived world view and the
more difficult it becomes for him to refute it without
losing face the chance of him calling you a racist, bigot,
homophobe approaches infinity.

This is despite the thread you are in having not mentioned
race or sexual preference in any way that is relevant to
the subject." Grey Ghost