[RE-wrenches] High Volume Solar Pumping

[Windy Dankoff]

John - A resistance test of each leg will show you the cable + windings that should be roughly 1 ohm, and they should be equal within .1 ohm. This will verify if the cable, splices and motor windings are OK. But, it won’t tell you if there is a mechanical issue. I may be able to help you directly, or else refer you to a solution. I’ll write to you off-list if you don’t mind.

As an aside, if I may put on my educator hat:  The industry uses the term 3-phase to refer to conventional 3-ph AC pumps. Your helical rotor pump, we refer to as “brushless DC” or the better, but less common term “electronically commutated motor (ECM)”. It does use a form of 3-ph, via 3 wires, but we name it something more specific to distinguish it from the conventional AC.

— Windy


> On Sep 21, 2018, at 1:10 PM, re-wrenches-request at lists.re-wrenches.org wrote:
> 
> From: John Blittersdorf <john.blittersdorf at gmail.com <mailto:john.blittersdorf at gmail.com>>
> Subject: Re: [RE-wrenches] High Volume Solar Pumping
> Date: September 21, 2018 at 6:28:50 AM MDT
> To: RE-wrenches <re-wrenches at lists.re-wrenches.org <mailto:re-wrenches at lists.re-wrenches.org>>
> 
> 
> Hi Windy,
>     I have a question about 3 phase pumps but slightly off topic for this thread.  I have a Lorentz pump I bought from you 18 years ago and is at 480 feet and my well will only
> give me 1 gpm with occasional air coming up .  I replaced the control board 3 years ago and it had been working fine.  It quit a few months ago right when we were getting into a drought here in Vermont.  How can I be sure it is a controller issue and not the pump itself.   My spring has dried up and I am now pumping from my other building and another spring 800' away using a Shurflow 12v pump.  It is not doing well.  You mentioned a Lorentz distributor which triggered me to jump in here.  Is there a way to determine if the pump is good with resistance test of each leg? Or leg to leg with wires disconnected from controller?  
> 
> John Blittersdorf
> CV Wind Service (and Solar)

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