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Causes of Submersible Pump Tripping

Nov. 05, 2020

Why does the submersible pump trip after a few minutes of operation? The following two ideas are for reference only, and you can troubleshoot from both electrical and mechanical failures.

Mechanical failure

First of all, for mechanical reasons, I think it is more likely that the bearing is short of oil and the impeller is stuck by foreign matter. When the bearing is short of oil or the impeller is jammed by foreign objects (such as ropes, stones, etc.), the motor is overloaded and the current increases. Then the thermal relay will make the contactor coil de-energize and trip; if there is no thermal relay, the MCB may also trip.

Secondly, it may also be because the water is too shallow and the submersible pump is not completely covered by the water. If the submersible pump is not covered by water, it will not get good heat dissipation, the temperature of the motor will rise, and it may also cause a trip.

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Electrical fault

1. Short circuit between turns

When the motor coil insulation is broken, it may cause a short circuit between turns (part of the coil is shorted). A short circuit between turns will shorten the effective length of the coil, decrease the impedance, and increase the current, which will cause the air switch to trip.

2. The power cord is too long

Although the subject said that the voltage is normal, it did not specify where the voltage is.

If the power cord is too long and the line resistance is large, there will be more voltage drops. That is, although the switch terminal voltage is normal, the voltage to the submersible pump is not enough. If the motor voltage is insufficient, the current will rise, which will also cause a trip.

3. The switch is too small

If the rated current of the switch is too small, when the submersible pump runs for a period of time, the switch will trip due to overload. When selecting the switch, you must ensure that the rated current of the switch is greater than the actual current of the submersible pump.

4. Insufficient capacitance

If it is a submersible pump that was used normally before, and it trips after a period of time, it may also be because the capacitance of the submersible pump is too small. A small capacitor capacity will cause the phase between the main and auxiliary windings of the motor to change, and the rotation force and speed of the motor will decrease, resulting in insufficient power and larger current.

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