Precautions for use of submersible electric water pump

(1) in the well submersible electric water pump cable connected to the live cable before the use of high-impedance voltmeter test the motor winding insulation resistance of the chassis, the value of the hot state should not be less than 0,5 megohm, otherwise Check the wiring and identify the cause.
(2) If the oil-filled motor insulation resistance is low, the winding should be dried, and replace its internal insulating oil.
(3) Check the motor and pump with the size, the amount of electric motor control in the 2 mm or so, check and confirm the disk drive with the shaft, the electric pump shaft can rotate.
(4) in the well submersible electric water pump before the well, should be carefully according to instructions to handle the cable outer connector insulation and sealing.
(5) into the well electric water pump, only to make it completely submerged in water, the well water temperature is not higher than 20 ℃, water pH (pH) of 6,5 ~ 8,5, chlorine ions in water does not exceed 400 ml / Liter and sediment concentration of not more than 0. Ol% to start using the pump.
(6) and supporting the use of protective switches. Electric water pump in the well underwater work, its operation is difficult to observe, if the pump fails to run without protection switch protection, it is very easy to make the motor winding damage. Typically, the protection switch in the wells submersible electric water pump operating power more than 1.05 times the rated current, the action can be within a specified time, its 7 times the current rating of the braking state, the protection switch action time shall not exceed 5 seconds.
(7) to ensure that the electric pump three-phase winding terminal voltage of 342 ~ 418 volts, the voltage is too high or too low will affect the normal operation of the pump, and serious damage to the motor winding. , & Lt;
(8) check and confirm the electric pump rated head and actual head difference does not exceed 20% of the rated head, or should remove the impeller and a wheel with a high degree of the same bushing instead of or close the small water valve, the actual lift Close to the actual head of the actual head of the calculation formula for the actual needs of head = downhole lift + uplift head + loss of head
(9) in the demolition and installation wells submersible electric water pump, both can not be forced to pull the cable, can not make the cable in a free-hanging state. Use, should be every 5 to 10 meters will be fixed in the water pipe on the cable.
(10) wells submersible electric water pump diving depth, usually 2 to 5 meters is appropriate.