Solution of common faults of small three phase submersible pump

Symptoms Analysis of the reasons for the exclusion method does not start after the water 1. Impeller stuck 2. The power supply voltage is too low 3. Power off or phase failure 4. Cable break 5. Plug damage 6. Cable drop too large 7. Stator winding Damage; serious resistance imbalance; one phase or two phase circuit; to ground insulation resistance is zero 1. Clear debris, and then use the hand wheel impeller to see if it can rotate. If you find that the impeller end face rubbing with the mouth ring, you need to use the pad to lower the impeller pad higher. 2. Use high-lift pump, or reduce the pump head 3. Step by step check the power fuse and switch part, find and eliminate the fault; Check the three-phase temperature relay contacts are connected and make it work 4. Detected Break point and connect the cable 5. Replace or repair the plug 6. According to the length of the cable, use the appropriate cable specifications, increase the conductive area of ​​the cable to reduce the voltage drop cable 7. Re-stator winding re-line overhaul, The best design data according to the original rewound too little water 1. Head is too high 2. Filter plugging 3. Impeller circulation part of the blockage 4. Impeller steering wrong 5. Impeller or mouth ring wear 6. Submersible pump diving depth Not enough 7. The power supply voltage is too low 1. According to the actual needs of the head height, select the pump model, or reduce the head height 2. Clear pump grid and other debris around the grass and water 3. Disassemble pump parts of the pump to remove miscellaneous 4. Replace any two of the power cord is not connected to the ground wire 5. Replace the impeller or the mouth ring 6. To deepen the diving depth of the submersible pump 7. Lower head, electric pump (1) Centrifugal pump, the use of the lift is too low; axial pump for the use of lift is too high (2) electricity Pump voltage is low, the pump current is more than the rated current (3) pump two-phase operation (4) pump reverse operation (5) increase the density of the liquid transfer, causing the current increase (6) pump mechanical Fault 1. Identify the specific reasons for the protection switch trip or fuse blown, and then the right medicine, to be adjusted and excluded 2. Power or power-off phase 3. Pump out of the box water, the connection cable is broken 2. Connect the wire 3. Open the cable box and connect the insulation tape on the broken cable to eliminate the leakage reason of the outlet box. Assemble the cable as it is 4. Burn out the stator winding 4. Re-lay the stator winding offline. In addition to timely replacement or repair of stator windings, but also according to the specific circumstances to eliminate the root cause of failure of the stator winding burn 1. Grounding wire wrongly connected to the power cord 2. Off phase work. At this point the current is much larger than the rated value, the winding temperature rise is high, a long time will cause insulation aging damage to the stator windings 3 mechanical seal damage and leakage, reduce stator winding insulation resistance damage to the windings 4 impeller stuck, electricity Pump in three-phase braking state, this time the current is about six times the rated current, if there is no switch protection, quickly burn the winding 5. The end of the stator winding pump shell, and the ground breakdown 6. Electric pump to open , Stop too often 7. Submersible pump dehydration running time is too long 1. Correctly connect the ground wire in the electric pump cable to the ground or temporary ground wire of the power grid 2. Check the cause in time, Power lines, or replace the cable 3. Often check the submersible pump insulation resistance, insulation resistance drop, timely measures to take measures to prevent 4. Take measures to prevent debris into the pump stuck impeller, pay attention to check the pump mechanical damage , To avoid the impeller due to some kind of mechanical damage and stuck. At the same time, once the pump is found to be running out of water, the pump should be shut down immediately for inspection. Take appropriate measures for overhaul. 5. When rewinding the winding, handle both ends as much as possible while removing the iron lumps on the inner surfaces of the upper and lower covers. Avoid touching the end of the winding shell 6. Do not open and close the pump too often, to avoid overloading the pump or bear unnecessary impact load, if necessary, restart the pump should be after the water within the pipeline back to the end Restart 7. Run should pay close attention to the decline of the water level, can not make the pump a long time in the air to run, to avoid lack of cooling and lubricating pump conditions

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