Automatic Switch-Off for Electric Water Pump

Why not just get a submersible pump with an inbuilt float switch?

Some pumps already come with a float switch on a cable. You simply tie this cable to set the depth of water you need. As long as the water does not fall below a certain depth, the pump will run. Once it falls below a designed (by the manufacturer, not you) depth, it will automatically stop. If you're not a technical person, talk to a pump supplier and explain your requirement to him. He will be able to help you out.

If your pumping from a tank you can build in a low\high level float switch, or if your pump has a back flow valve you can put a pressure switch at the output side of the pump to control the motor.

Hi mad4u

You would require the switches in the tank. There is a wide range available to choose from. Get some quotes.

If your water supply at the pump is limited you may require a switch at the pump as well.

Thank you for the advice I shall try to get some quote and update you as well about the progress.

Regards Vikram

Hello Dear,

i m an engineering student & i can help U. So, plz send me ur identity & call me at 09868815985.

Hi

My name is Vikram, Just came to India,my number is +919618032099 (+91 is country code, rest is my personal number my house number is +91-40-24753137).

If you can let me know name, your country code and the best time to call you.

Waiting for your reply.

Regards Vikram

What is the purpose of the pump? What condition would turn it on and what would turn it off?

Purpose of the pump is to take water from down stairs tank and pump water to top floor.

Condition is that on certain level in the tank it should switch on(say if the water level is dropping to 6 inches in the tank from the ground level it should turn on and turn off when it reaches to few inches left in the tank) when it reaches max in the tank it should turn off by it self!.

I should NOT manually switch on an off the pump.

Regards Vikram

I built something like this to control the pump to empty a sump in my house. Except your application sounds much larger, but that's the pumps problem not the control's.

"Condition is that on certain level in the tank it should switch on(say if the water level is dropping to 6 inches in the tank from the ground level it should turn on and turn off when it reaches to few inches left in the tank) when it reaches max in the tank it should turn off by it self!."

I'll guess that the "6 inches" and the "max in the tank" refer to the upper tank and the "few inches left in the tank" refers to the lower tank.

You have one condition to turn the pump on and either of two conditions to turn the pump off.

You would need 2 floats, one in each tank, a relay to control the pump, and 3 switches. The switches could be types that could be wired to be normally open or normally closed or you could use 1 normally open and 2 normally closed.

When the upper float has dropped to "6 inches" it should trigger a normally open switch (s1) to the closed position. When the upper float has risen to "max in tank" it should trigger a normally closed switch (s2) to the open position.

When the lower float has dropped to the "few inches left in tank" it should trigger a normally closed switch (s3) to the open position.

The power should go to s1 then to the relay to turn it on. Output from the relay should go to the pump and to s2 and then to s3 and then back to the relay to hold it on.

Closing s1 would turn the pump on. Opening s2 OR s3 would turn it off.

I'll see if I can draw up a wiring diagram and post it later.

Lew

In my country, we used pressure tanks with pressure switches. They were installed between the water source (well) and the main inlet pipe leading to the house. A water pump is necessarily situated also between the well and the pressure tank.

The purpose of the equipment was to assure a steady supply of water flowing through the house's faucets at a steady pressure. As water is used in the house, and the pressure drops in the pressure tank to a certain level, the pressure switch turns on the pump, and water fills the tank. Once the max pressure level is reached, it switches off the pump, too.

Here's how it looks:

Go to this site to know more about this set up. Clicking on the pic above will do that, as well.

That's was really helpful, thanks for that picture as well.

Regards

Regards

I have been using a locally designed control for max-level only, but it can be added with circuit to control min & Max both levels.

Hope of any use.

Any query is welcome

Haajee

HI Haajee,

PLease let me your contact info at ankur.usa@gmail.com so that I can talke to you regarding some product requirement I have because it seems that you can help me. Thanks

Hi Thanks for the information, i have purchased and installed it by third party, it is working well for now. Regards Vikram

REgards

Fine

Enjoy !

Regards.

The assembled unit I referred to in my previous post is an indigenous one of my own design & idea.

Regards