booster pump for a sprinkler system

[dundon]

I have a flow switch thats suppose to be wired with a relay that will tell that motor when to cut on or off its for a sprinkler system on a football field have no drawing dont know what kind of relay i need all i know is im wiring the motor for 230 volts single phase. Does any one know about this set up the sprinkler guys were suppose to provide it but they said they dont know what happened to it.thanks

 

[itsmoked]

Business as usual....

You need to tell us more about what you want to do..
Otherwise a lot of wasted effort will go into helping you.

Is the pump always supposed to run when watering?

Is watering initiated with a switch?

Is the flow switch to protect the pump?

Or to run the pump?

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[waross]

A few more questions;
Is there a timer or programer to control the watering?
What is the water supply? That is is the water supplied from a water main but needs to have the pressure increased or does it come from a well or cistern or another pump?
yours

 

[OperaHouse]

The flow switch turns on the contactor and the contactor turns on the pump. Since this is a booster pump, water flow can start without the pump being on first. Power can be supplied all the time. The contactor must be sized to the motor. Electrical disconnect, fusing/breakers, and GFI as per local codes. If you do not feel comfortable determining these items you need to call an electrical contractor.

 

[waross]

Hi OperaHouse.
That'll work.
respectfully

 

[itsmoked]

Agreed.

Keith Cress
Flamin Systems, Inc.-

http://www.flaminsystems.com

 

[powerjunx]

Due to ambiguity of the dundon's query, idea above is enough to fullfil its operation unless otherwise is specified.

 

[dundon]

Sorry i ddint post went back to job site today we put in a 2 pole switch and a contactor. the flow switch will pull the contactor in the coil is 24 volts, the 24 volt side and the wires we put in by sprinkler company. but i thank i have another problem after we wired the motor for 230 volts and hooked every thing up i turned on the breaker checked the line side of contactor had 208 volts the motor name plate says 230 volts will it work being that much of a difference .I guess the boss will be pissed i should have checked it out a little closer i thought they would have installed a motor with the voltage they had in this building

 

[jraef]

Most motors are designed to work within a + or - 10% voltage range at rated torque and load, so since 230 x .9 = 207V, you should be fine. This is a very common occurrence by the way.

Eng-Tips: Help for your job, not for your homework Read faq731-376

 

[powerjunx]

dundon, jraef is right.

Worry no more!

 

[EEJaime]

The described control scheme assumes there is inough water pressure to start water flow sufficiently to close the flow switch which starts the pump. If that is the case then all is well.