Considerations when using a submersible pump

(A) The direction of rotation of the submersible pump must be correct
The correct steering of the submersible pumps, looking down from the top, the impeller should rotate counterclockwise. Motor and pump assembly, you can test the power cord in advance, so that the motor steering in line with the above requirements. Note that the motor in the test run, the motor chamber must be filled with the required liquid, in the air, try to turn the time not more than 1 minute. If the submersible pump has been assembled, you can not try to turn in the air, so as not to damage the rubber bearing submersible pump, then you can observe the operation of the submersible pump to determine whether the correct steering pump. In general, in the same conditions and the installation of water pipes under the circumstances, the greater the volume of its rotation in the right direction. Submersible pumps if the long-term reversal, while the protection switch and failure, the submersible pumps may be burned due to overload, so every time the power cord for access, pay close attention to the direction of rotation of the submersible pump.
(B) Check for abnormal conditions
Close the switch, the first to see whether the normal operation of the pump (which can be reflected by the ammeter and sound). If there is an abnormal situation, you must disconnect the power supply within 10 seconds to prevent damage to the submersible pump windings.
(C) check whether the voltage to meet the requirements
Always check the operating voltage of the submersible pump to ensure that the deducted cable voltage drop, the direct supply voltage of the pump windings in the 342-418 range.
(D) often check the submersible pump current value
In normal operation, the current value shall not exceed the rated current. When required to overload the use of electric pumps, the maximum operating current shall not exceed 5% of the rated current value.