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Thread: Submersible won't shut off

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  1. #1

    Submersible won't shut off

    My submersible pump in a shallow well/spring won't shut off causing water pressure to go above 100psi until pump probably overheats and shuts down. I am not sure what causes it to shut down but I suspect their is some kind of over temp protection system. I think the pump is a Franklin 3/4hp 230 volt. I thought the problem was the pressure switch, a square D, and replaced it but found that the points were closing at 20psi and opening at 40 psi as it should but pump continues to run building pressure. I am able to turn off pump with circut braker to pump.

    It does not do this every time but pump cycles a time or two normally then has this trouble and continues to run. Also, if I bump the open contact points on the pressure switch closed then open when it is going over the pressure limit it will flash something and the pump will shut down and pressure drops until 20 psi and starts over again like normal.

    I replaced the control unit with a Goulds unit for a 3/4 hp pump that I had around from another well but problem remains the same. Orginal unit was a Franklin Electric 2801074915.

  2. #2
    Pump guy speedbump's Avatar
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    I think you are saying the points are opening but the pump keeps running. If this is the case, the points are not controlling the motor. With the points open and the motor is still running, the switch is not in control of the motor. Check your wiring.

    bob...


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  3. #3
    quote:Originally posted by Mike S

    opening at 40 psi as it should but pump continues to run

    Also, if I bump the open contact points on the pressure switch closed then open when it is going over the pressure limit it will flash something and the pump will shut down
    Perhaps the pressure switch contacts are energizing another relay (or contactor)? Just a thought, trace out your wiring, find out what the pressure switch is supplying power to, if it goes directly to the pump, then I give up.

    Rancher

  4. #4


    Yes it runs with the points open. I am not sure how it is getting energy with the line open at the points and also a circut breaker in the line has no effect. Maybe the wires are shorted with the power wires going down the conduit and picking up power.

    I do have a suspicious area where some cement trucks have been turning around over where the lines are buried.

    I was also wondering if there is some relay that could be sticking on the controler or the pump or somewhere else?

    Thanks for the replys.

  5. #5
    Pump guy speedbump's Avatar
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    Usually with larger pumps, pressure switches are used to actuate a contactor (relay) to handle the large amps pulled by a large motor. This would still require one set of points to be closed. Unless there are more than one object controlling the pump motor.

    bob...


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  6. #6
    I was thinking maybe the contactor had it's contacts welded closed, however that wouldn't explain the intermitant problems.

    Ranch

  7. #7
    Pump guy speedbump's Avatar
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    I agree, I'm not sure what's going on unless there are some burned wires somewhere. But you would think that would be a very temporary thing.

    bob...


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  8. #8
    I am still trying to trouble shoot the problem but now it is working fine. On at 20 psi and off at 40 psi. I have the cover off the pressure switch and I have been watching the contact points open and close. When it is doing its running on problem the pressure would open the points at the switch at 40 pse but the pump and the pressure would continue on.

    A little more information; the pressure switch only operates a switch line which goes from the pump house back to the house and then down to a relay at the well which closes connecting the 220 volt lines and runs the pump.

    A couple of odd things that I noticed when I was having the trouble: When it was having it's problem I could, lets say, flash the line by bumping closed the points at the pressure switch with a screw driver for a second and the pump would turn off. I am not sure what was happening there to fix the problem temporarily.

    Another time I had the 220 volt power to the pump turned off at the main panel and walked down to the pump and I could hear a buzzing which could have been the relay and when I fliped another switch that I have down there closed the noise went away. Unfortunatly for me when I turned the switch back on it would duplicate the noise and I am not sure if the noise was the relay or maybe the pump protection box buzzing.

    If I can get the system to duplicate the problem I will test with a volt meter and see if voltages look right.

    I am also going to hire a back hoe and start digging along the line going to the pump house to see if I can find a crushed conduit. I am suspicious there may be a problem because the conduit comes downhill to the house and water comes out of the electrical conduit at the house. The conduit in question contains the switch line for the pump and 220 power for the pump house. But it has been leaking water for more than a year when it is raining and the run on problem only just now happened and the ditch is dry.

  9. #9
    Pump guy speedbump's Avatar
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    Before I went to the expense of looking for a bad spot, I would just replace all the underground wire and be done with it.

    bob...


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  10. #10
    I can well imagine that it will come to that. If the conduit is crushed it may not be possible to fix properly and I will just continue on with trenching and pull new wire. I dread seeing what the price of copper wire is going to be.

    Thanks

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