Question about Sta Rite 1 1/2 Hp Above Ground Pump Ne642

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Pump starts and immediately trips breaker - Sta Rite 1 1/2 Hp Above Ground Pump Ne642

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  • nreinhar Aug 01, 2009

    Running on its own circuit, ran fine for 6 years then had this problem. Took it to the pool store today and they replaced it with a new pump, but the same thing is happening again.
    Could the unbelievably wet weather here have caused an electrical problem?



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If it buzzes but doesnt actually turn then check the starting capacitor .. when bad, the motor wont know which way to turn and will just buz and get hot until a thermal breaker or external overload breaker trips .. that should happen in about 5 or 10 seconds .. the same thing will happen if the pump is jammed .. make sure it turns freely ..

Posted on Aug 01, 2009

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I would first look at if it is being run on it's own dedicated circuit or if there are other things on with it. Initial start up of a motor or pump in your case there is a surge of power and the amperage will spike up at the start and then come back down after it is running. The pump should have a nameplate on it that says the amperage pull. Make sure you have it running on the correct wire size and breaker. If you have the correct breaker, wire, and it is running on it's own dedicated circuit you may also want to check the connection at the pump or where it is being switched at to make sure that there is not a dead short. Also, is this pump operating at 110v or 220v? Check it out and let me know.

Posted on Aug 01, 2009


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If the mcb is tripping immediately it indicates a large overload such as might be caused by shorted turns in the motor windings (or bad wiring).

The mcb might trip after a short time with a faulty capacitor - the usual sign the capacitor has failed is a humming noise and the motor turning very slowly or not at all, usually the latter.

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You have 240 volt 30 amp breaker

A 1 2 3 4 sounds like 240volt T104 or 240volt T106
These look the same but are two different timers.
The T104 is made for regular on-off operation, while the T106 is made for 2-speed pump.

Now is the pump 240Volts, or 120Volts?
Look at nameplate on motor.
Is the motor single speed or 2-speed?

If pump is 2-speed, then motor will have 3 wires, and nameplate will say Hi and Low.
There is usually a yellow wire with 2-speed pump.

NOW, lets suppose you have 120Volt single speed motor.
You can convert the 240Volt T104 into 120Volt T103 timer by changing the clock motor from WG1573 to WG1570 available at WW Grainger. And then switch white wire inside breaker box to make circuit into 120Volt circuit.

If you have T106 2-speed timer, it can also be converted to 120Volt using same clock motor change-over.

Add a comment and describe your wiring very carefully. Include voltage and exactly which wires are connected, because the description of 'terminal 4 and L4' was too confusing

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