Submersible pump current is too large to do?

Causes of excessive current of submersible pump
1, sewage submersible pump bearings or shaft wear, seal ring wear, the solution to replace the bearing and shaft.
2, submersible sewage pump use of the head too low resulting in submersible sewage pump flow is large, beyond the scope of use of the sewage pump motor overload, cause, solution is to adjust the submersible sewage pump outlet pipe valve, reduce the submersible sewage pump outlet flow control, current use of submersible pump at rated current range.
3, bearing wear, impeller and sewage submersible pump pump shell friction caused by the solution to replace the bearings, impeller and pump shell.
Level 4, submersible sewage pump pumping down to below the impeller water inlet end resulting in intermittent water pump body and the motor caused by anhydrous cooling fever, the solution can reduce the amount of sewage pump off a small valve, or installing a liquid level control system.
5, sewage submersible pump shaft bending, bearing due to the poor, the solution to the manufacturers to repair, replace the bearing.
The submersible pump is generally a four core cable (three-phase pump), use a multimeter to test, the multimeter resistance to stall, because the three-phase winding is connected in star, so you can use a multimeter to measure three lines are open, and the resistance value is very small, and consistent. Not much difference, is ohm resistance. This shows that the three-phase winding is basically normal. The rest of the line should be connected with the shell of the submersible pump, it shows that the ground is also connected to the. At this time, still need to put the root ground left any of the three lines and one cable in measuring the resistance, under normal circumstances, should be infinite, which is between the winding and the wire insulation measurement, the bigger the better. In addition to explain the use of multimeter can probably check the submersible pump on insulation, due to universal battery voltage table is not high, so the insulation of submersible pump should use 500V insulating shake table to detect, the normal value shall be at least 500 billion euro to be qualified.