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Author:
glentaybow (FL)
Hello: First post on this forum. I'm in the middle of a rainwater harvesting project and have purchased a Rainmaster single phase 115V submersible pump and Rainmaster pump controller. There are 6 terminals labeled L1, N, Gnd. Then, Gnd, U, V. The instructions say, "the pump controller is wired between the main electrical source and the L1, N, Gnd terminals inside the pump start box." Not sure what to do with the Gnd, U, V terminals. I think a connection should be made between the Gnd, U, V terminals of the controller to the Gnd, L, N terminals in the pump start box, but I'm not sure. Need help identifying "u" and "v" terminals on pump controller.
Thanks, Glenn
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Author:
hj (AZ)
the directions on the controller itself are probably better than their documentation. The u an v terminals appear to be a switch. With your pump the drawing shows "something" in the wire connecting the two terminals. For a "heavy duty" pump the U and V would connect to, and operate, a relay to run the pump indirectly.
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Author:
glentaybow (FL)
Yes, you are correct. The instructions talk about how to wire it if it's a 3 phase pump using a remote control switch...then you use the u and v terminals. Or also if the pump has an electrical demand greater than 16 amps, you would use the u and v terminals. My particular pump has a demand less than 16 amps and is single phase. Inconveniently, no instructions in this case. I did use my electric meter to test resistance of pairs of terminals. The two Gnd's have no resistance, as would be expected. Also, the N and the V have no resistance. Does that tell you anything?
Thanks, Glenn
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Author:
Fixitangel (NC)
According to this Rainmaster diagram, V, U, and PE terminals are in a pump connection box. which is an interface between the pump and pump contol box. PE is Ground, and L1 and Neuteral (source) connect to the pump V and U terminals (load).
[www.rainharvest.com]
GFCI circuit protection MUST be provided. If in doubt, call a sparky.
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Author:
hj (AZ)
quote; Inconveniently, no instructions in this case.
If you have the same instructions as on the Internet, then your situation is diagram #2, but the Internet version is too blurred to see what the small box is that the wires from the terminals go into.
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Author:
Paul48 (CT)
The link Fixit posted is fairly clear. Although it's not clear if "V" is L1, or "U" is L1.Perhaps they are switching both "Line" and Neutral", so it wouldn't matter.
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Author:
glentaybow (FL)
An ohm meter across N and V have "0" resistance. So, does that tell you that U is the load?
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Author:
Paul48 (CT)
Does L1 to U also yield "0" resistance, and do they change to infinite with controller operation?
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Author:
Paul48 (CT)
I've come across control wiring from Europe that opens and closes hot and neutral.We generally, just open and close the hot leg here in the states.
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Author:
glentaybow (FL)
I haven't operated the controller, but L1 to U gives no reading at all when checking resistance.
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Author:
Paul48 (CT)
That is not possible.Readings are somewhere between "0" and infinite.
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Author:
glentaybow (FL)
I guess what I meant to say is that it's an open circuit....no connection between the two.
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Author:
Paul48 (CT)
I believe you, but it doesn't make sense. I'd contact tech support for the manufacturer.
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Author:
hj (AZ)
quote; Although it's not clear if "V" is L1, or "U" is L1
Neither. They are just two sides of a switch, so they "switch" whatever is attached to them, but NEVER a neutral.
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Author:
hj (AZ)
U and V are the two sides of a switch, so EITHER can be the "load". U and V will just "switch" whatever you connect to them, whether it is a pump or a relay.
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Author:
hj (AZ)
Why NOT. U and V are NOT connected to ANYTHING except themselves and whatever you eventually connect to them
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Author:
hj (AZ)
That is like saying that the X-X terminals in a Honeywell RA-832 relay HAVE to be connected to something.
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Author:
Paul48 (CT)
Here's my thinking...maybe wrong. He has 3 connections coming into the controller, and 3 out.He's identified one closed circuit through the controller. That would seem to be L1 to the pump, a switched circuit. Why would the other circuits be open...neutral and ground?
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Author:
glentaybow (FL)
So perhaps it doesn't make any difference how you connect the U & V of the pump control to the L1 & N in the pump connection box. I have contacted the manufacturer tech support, but they have not gotten back just yet.
I would like to thank you guys for chiming in and trying to help me.
Glenn
Edited 1 times.
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Author:
hj (AZ)
The terminals he is asking about are used to control pumps that have requirements different that the controller can operate directly, but if the pump is NOT directly incompatible, there is an alternate wiring through the terminals, but the online drawing is to indistinct to see what is done.
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Author:
hj (AZ)
quote; So perhaps it doesn't make any difference how you connect the U & V of the pump control to the L1 & N in the pump conn
It definitely DOES. It is just a switch, and at some point during its operation the two terminals are connected together. IF you connect L1 and N to those two terminals, you will have a "dead short" and probably destroy the controller. At the most, you would connect the hot wire for the pump to those two terminals, but since we do not have a 'good" diagram, we cannot tell you if that is all you do. The small "square" in photo two MAY be the pump's motor with its "L1" connecting to the two terminals to operate it.
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Author:
glentaybow (FL)
This morning, I got a reply from the tech rep at RainHarvest Systems. Here's what he wrote:
"Sorry about the confusion Glenn. The connection from the terminal V in the pump control connects to the L terminal in the pump connection box. V or voltage is the European equivalent of L or load. I will make that clearer on our diagram, thanks for pointing that out.
Hope this helps."
Thanks guys for all the input.
Glenn
Edited 1 times.
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