All kinds of submersible pump type timing of submersible pump and its control system to protect all maintenance, at least do l all preventive maintenance and repair, including: boot oscillation and voltage and current abnormal movement, launch device operation is not normal, over temperature alarm, Water Leakage is control the multiplex protection not often action, main cable and cable control element aging crack, the main contactor is stuck burrs, oxidation or thermal relay settings are not correct, the winding insulation layer without signs of aging, the insulation resistance is too low, the three-phase winding resistance is not balanced, stator rotor ask is not sweeping or scratches control system, liquid level meter is not accurate, on the lower limit of the output is not normal and reliable, the floating ball action is not reliable, the temperature detection element is not aging, malfunction of oil Emulsion, mechanical seal is not intact, the bearing wear, impeller with and without abrasion and cavitation, axis is not rust deformation or wear, motor inside and outside fastening screws with and without loose debris removal and cooling jacket and a circulating water pipe, pump around the L1 and without sediment or blocking etc..
