Hi Darcy,
I don't have any experience with phase converters but I do understand
voltage conversion.
What you need is a buck-boost transformer. These are basic 60Hz iron
core transformers, but have secondaries that are intended to be wired in
series between the power source and your load.
In your case you want a 240Vac primary with a 32Vac secondary. When
wired out-of-phase it will subtract (buck) the 240 down to 208. Be
careful not to wire it in-phase or it will add and you'll end up with
270V. Check with a voltmeter before you connect it to the load.
This assumes a simple 240 to 208 connection. It is more probable that
you need a 208V 3ph wye connection. For that you will need two or three
transformers to deal with each pole (with differrent voltages of
course). That will depend on how the phase converter is connected.
Good Luck
Chris Poulsen
Sr Design Engineer
PowerStream Technology
www.PowerStream.com
Darcy Davis wrote:
Hey Guys,
We've found ourselves in somewhat of a bind. We've got a PCB router in house
which is powered from 3-phase 208V. Its a very, very long story, but its
going to be 10wks till our utility supplies 3-phase power. Currently we have
240V single phase power, so I've looked into a phase converter but we still
need to bring the voltage down to 208V. The other option we've been trying
is to use a generator. Turns out that when the 5hp vacuum motor fires up,
the generator doesn't respond quickly enough to counteract the effect, so we
suck the voltage (and frequency) through the floor. This of course causes
the motor controllers to complain. We've got a 20kW generator already (for a
~4kW load), so I don't think a bigger generator will fix the problem. Is
there another way around this with a generator? (Ie, could we try to run the
controllers from a UPS or will we kill the UPS?) If we were to run a 3-phase
motor load continuously while we run the router, would it tend to buffer the
effect? Power systems is well out of my league, so any comments you have
would be welcome.
Thanks,
Darcy Davis
Design Engineer
=========================================================
Dynastream Innovations, Inc. Ph: (403) 932-9292 ext. 132
228 River Ave. Fax: (403) 932-6521
Cochrane, AB T4C 2C1 Web: www.dynastream.com
Canada
=========================================================
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