[RE-wrenches] Starting 3/4 Sub Pump (was Power Factor)

[Matt]

Geeze,
Are the PF meters available separately without having to replace a perfectly fine 337?

Matt
---- boB Gudgel <boB at midnitesolar.com> wrote: 
> Allan Sindelar wrote:
> > Matt and boB,
> > This is only somewhat relevant, but may help:
> > A few days ago, on initial bootup of a new system with a Magnum MS4024AE, we
> > easily ran a 1HP submersible at nearly 500' head plus pressurizing (single
> > pump system). However, this was a Grundfos SQ, so the soft-start made it
> > much easier. Steady draw was about 88ADC at 25 VDC, or around 2200 watts. I
> > had cautioned the client that this combination wasn't certain to work,
> > although I expected that it would. 
> >
> > Allan Sindelar
> >   
> Hmmmm....  If this is a submersible pump, how would you really know it 
> was trying to start or not ?
> Maybe he just can't hear it trying to start, as short as that try might be ?
> 
> Yeah, I'd check the current and voltage when trying to start off the 
> inverter and also the generator
> just for a reference point.   Sounds like a great use of a PF meter 
> actually.
> 
> boB
> 
> 
> 
> > Allan at positiveenergysolar.com
> > NABCEP Certified Photovoltaic Installer
> > EE98J Journeyman Electrician
> > Positive Energy, Inc.
> > 3201 Calle Marie
> > Santa Fe, New Mexico 87507
> > 505 424-1112
> > www.positiveenergysolar.com
> >
> > -----Original Message-----
> > From: re-wrenches-bounces at lists.re-wrenches.org
> > [mailto:re-wrenches-bounces at lists.re-wrenches.org] On Behalf Of boB Gudgel
> > Sent: Thursday, July 30, 2009 4:45 PM
> > To: Matt
> > Cc: RE-wrenches
> > Subject: Re: [RE-wrenches] Power Factor
> >
> > Matt wrote:
> >   
> >> Possibly a PF question, or maybe one for Magnum - boB,
> >>
> >> One of the guys at work is (almost) running a 3/4 hp sub pump with a Magna
> >>     
> > AE 48. Or rather, he isn't. According to him when he first fired it up, it
> > operated the pump just fine. The next time he tried, though. he couldn't
> > even get a buzz out of the starter. No workee.
> >   
> >>   
> >>     
> > Sounds kind of like a "pump is broken or worn out" problem, doesn't it ?
> >
> > If there is enough ac voltage applied to the pump, the it should do 
> > ~something~, or lights should dim or some
> > kind of sign should show itself, wouldn't you think ?   Otherwise, I 
> > would suspect it might be a surge problem.
> >
> > Is there a pilot light or something ?   Maybe a fuse blew or breaker 
> > tripped somewhere ?   (when the pump went off?)
> >
> > Doesn't sound like a PF problem though... However,  since you mention 
> > it, with loads that are not a 1.0 power factor,
> > at least for displacement power factor, when reactive phase shift is 
> > involved, the inverter must be able to "sink" current
> > from the stored reactive energy as well as be a source to the motor.   
> > The Magnum does that just fine, as does any other
> > decent inverter.
> >
> > Maybe Tony, Eldon or Gary at Magnum has seen this before ?    425-353-8833
> >
> > boB
> >
> >
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