Wiring SQE Pumps [RE-wrenches]

[Ray Walters]

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Hi Windy;

I know that would work to turn on the pump, but the constant pressure 
really is a constant 50 psi. There is no high or low, so I figured  I 
could set it to come on at say 45 psi(set on the conventional p switch) 
but how would it shut off? It wants to just sit there and run at 50 psi. 
If I set the cut off pressure above 50 it won't shut off, below 50 and 
it would never really come on, and right at 50 and it might shut on and 
off and freak its little variable speed computer heart right out.
I thought of using a conventional P switch for on and then have a relay 
set up to sense when voltage to the pump from the controller went to 0., 
when the controller thinks it doesn't need anymore water. Then when the 
p switch comes on again it somehow resets the relay and we do it all 
over again. They're really a bizarre controller with a pressure 
transducer not a switch (this was the Franklin Monodrive which 
apparently can work on any conventional AC Franklin motored pump)
I haven't measured its no load draw yet, but the Transformer and SW4024 
are better than 20 watts no load.
Maybe I should do as I do with Outbacks: leave it on and throw more PV 
at it. I considered putting back in the old control system as Allan 
mentioned, and maybe have a bypass switch setup to go to it? Might be 
good if that fancy controller bites some lightning or bad grid AC.

Ray 

Windy Dankoff wrote:

> Ray,
>
> You could control the pump with a standard pressure switch (so when  
> it's off, it's all-off) just like you did with conventional pumps.  
> But, since the system doesn't mind frequent starts, you can reduce  
> raise the cut-out setting on the P switch, so the pressure is close  
> to constant. Customer is not likely to perceive the slight cycling of  
> pressure.
>
> Just set the P switch lower than the max pressure setting of the  
> pump's controller.
>
> This isn't from my experience, just an idea that seems logical and  
> simple, and understandable by anyone who needs to service the pump in  
> the future.
>
> Windy
>
>
>
>> From: Ray Walters <walters at taosnet.com>
>>
>> Here's another pump question: I've recently started trying the  constant
>> pressure pumps from Franklin (the CP Mono-Drive and DO work on the
>> SW4024) and the SQE from Grundfos. People love the constant  
>> pressure, we
>> like the no surge, and higher efficiency. Here's the problem  though, on
>> regular pumps, we wired 120 vac to the pressure switch, which then  only
>> fire up the transformer and pump control when you needed water. On the
>> new constant pressure setups, they use a pressure transducer, or  signal
>> switch, and we have to leave the transformer and controller on 24/7.
>> I thought about using a 2nd regular P-switch to feed power to the
>> system, but with a constant pressure system it would never reach the
>> high pressure cutoff. I thought about a voltage relay that shut off  the
>> pump, when the controller quit sending power to the pump, but how  do 
>> you
>> turn it on? We thought about controlling the relay with the signal  from
>> the pressure transducer, but it might shut power on & off to the pump
>> every second....Day/ night timer.....
>> Who has the nifty way to wire this? Or just leave it all on, all  the 
>> time?
>>
>> Thanks as alway for all your great help,
>>
>> Ray Walters
>
>
>
> - - - -
> To send a message: RE-wrenches at topica.com
>
>


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