Common causes of submersible pump failure: First, the submersible pump start difficult or no water after starting. The main reason is: 1, the cable is broken, one phase is not energized or because the cable is too long (or too thin) caused by the voltage drop is too large; 2, the impeller is clogged with debris or rotation direction is not correct; 3, the motor stator winding burnout. Second, the submersible pump suddenly does not turn. The main reason is: 1, the power supply is cut off, the switch fuse blown or three-phase protection switch jump open; 2, the impeller stuck; 3, the motor stator winding resistance burn out. Third, submersible pump sound is not normal. The main reason is: 1, submerged depth is too shallow, the inhalation of air to form a vibration noise; 2, the bearing wear and rattle sound; 3, two-phase operation, the motor buzzing sound; 4, loose impeller; Hit book Zhen sound. Fourth, submersible pump stator winding resistance burn. The main reason is: 1, long-term overload motor running, pump deviate from the rated value is too large, the centrifugal impeller pump head is too low, increased flow caused overload. Axial impeller pump caused by overload too large head. When the amount of sediment in the water is large, the proportion of water increases causing overloading. 2, wet submersible pump motor is not irrigation, oil-filled submersible pump motor lack of oil, run winding windings. 3, single-phase motor start or single-phase operation. 4, frequent open pump stop, the motor overheating. 5, submersible pump dehydration work time is too long (more than 5 minutes). 6, the motor plunged into the mud, poor heat dissipation. 7, damaged cable or bad connector, water infiltration stator damp. 8, the cable is too long or too thin, the voltage drop is too large, so that the motor current increases. 9, impeller, pump shaft, diversion shell and bearing wear serious impeller stuck, power switch and no short circuit protection device, the stator winding resistance increases.
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