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Pump Start Relay Question

Discussion in 'Irrigation' started by jvanvliet, Feb 20, 2012.

  1. Sprinkus

    Sprinkus LawnSite Silver Member
    Messages: 2,156

    The restriction should actually decrease the load.
  2. jvanvliet

    jvanvliet LawnSite Gold Member
    Messages: 3,944

    How so?

    Bypassed the 40 amp breaker, no problems.
  3. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Messages: 48,909

    Is all the wiring rated for a 50-amp load?
  4. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 22,296

    This thread is nuts, IMHO. No real information has been forthcoming to make any of us even get close to the problem. Love to help, but the OP has to do some research before putting the questions to the forum. I'd be calling my pump guy and electrician, were I in that state. :dizzy:
    Last edited: Feb 21, 2012
  5. jvanvliet

    jvanvliet LawnSite Gold Member
    Messages: 3,944

    Apparently, #6 wiring coming into the the sub-panel; Master breaker is about 60 ft away. The HO originally operated a 7.5 HP motor and then replaced it with a 5 HP, when it failed it was replaced with a 7.5 HP.

    Electrician is coming to swap the breaker.
  6. jvanvliet

    jvanvliet LawnSite Gold Member
    Messages: 3,944

    What information are you looking for?

    Rainbird ESM Controller 24V Master Valve relay; Teco 7.5 HP PSR; Teco 24V Ice Cube Relay; Baldor 7.5 HP motor; 40 Amp circuit.

    Problem: circuit trips when pump start is initiated.

    Wiring proper and secure; voltage nominal; load to motor 36.46 amps (peak); clock and pump on same circuit.
  7. Mike Leary

    Mike Leary LawnSite Fanatic
    Messages: 22,296

    Hmm :dizzy: I've never done that, and Boots' explanation of why the (ice cube) relay was installed does not get it. either. Can the clock and pump be separated to isolate one or the other?
    Last edited: Feb 22, 2012
  8. jvanvliet

    jvanvliet LawnSite Gold Member
    Messages: 3,944

    The clock puts out 24V to the master valve. In order to initiate the PSR, I need 110V (it has a 110v holding coil), since I'm only getting 24V from the controller, I install the ice cube relay; it acts as a switch and send the 110v to the PSR. This is not an unusual application down here.

    A Hunter has a 24V holding coil, but is not adequate for this application in that it doesn't have a load sensor and interrupt. Hunter is fine for a HO application and I've used them there.

    I've seen too many Hunter/K-Rain/Orbit PSR's go bad on large installations. Usual symptom is motor doesn't initiate & melted wire; I'm guessing the relay starts to wear and begins to chatter (which was the problem here originally)or loose connections.

    Installers will put them in because they cost between $60 + $80. The Teco costs me $450.00 with the Ice Cube and retails for about $800.00

    As far as the controller and the pump being on the same circuit, it's also not unusual here, the typical builder shortcut. It would be too costly at this time to run a separate 110 V line out to the pump station just for the controller.

    Anyway, the problem is resolved, breaker has been switched and the pump sucks the chrome off trailer hitches.
  9. 1idejim

    1idejim LawnSite Fanatic
    Messages: 10,014

    when the flow is restricted, the pump requires less current to keep up with the demand, same theory the cycle stop uses.
  10. jvanvliet

    jvanvliet LawnSite Gold Member
    Messages: 3,944

    I C Thanks.

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