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

[boB Gudgel]

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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