1.Submersible pump pumping mud, overload caused by the medium density.
Measured medium density is greater than 1.3, or even 1.5 to 1.6; and the motor power factor is relatively small (generally 1.05 ~ 1.2).
2.The pump sedimentation, the impeller is brake caused overload, the motor is almost in the stall state operation.
3.The gap between the rotor shaft hole and the impeller mouth ring gap is filled with sand to brake overload caused by the shaft.
4.Individual manufacturers in order to lower prices in the competition to win, artificially reduce the motor power.