1. Unable to start

First, check the power supply: whether the connector is firmly connected; Whether the switch contacts tightly; Whether the fuse is blown; Whether three-phase power supply is equal. In case of open circuit, poor contact, fuse blown and phase loss, the cause shall be found out and repaired in time. Secondly, check whether it is the mechanical failure of the pump itself. The common reasons are: the packing is too tight or the impeller is blocked by sundries between the impeller and the pump body; The pump shaft, bearing and leakage reducing ring are rusted; Serious bending of pump shaft, etc. Elimination method: loosen the filler and dredge the water diversion tank; Disassemble the pump body, remove sundries and rust; Remove the pump shaft and calibrate or replace it with a new one.

2. Water pump heating

Cause: bearing damage; The clearance of rolling bearing or bracket cover is too small; The pump shaft is bent or the two shafts are not concentric; The tape is too tight; Lack of oil or poor oil quality; The balance hole on the impeller is blocked, and the impeller loses balance, increasing the thrust to one side. Troubleshooting: replace the bearing; Remove the rear cover and install a gasket between the bracket and the bearing seat; Investigate the pump shaft or adjust the concentricity of the two shafts; Properly loosen the belt tightness; Add clean butter, which accounts for about 60% of the clearance in the bearing; Remove the blockage in the balance hole.

3. Insufficient flow

This is because: the power speed is not matched or the belt slips, resulting in low speed; Axial flow pump blade installation angle is too small; The lift is insufficient, the pipeline is too long or the pipeline has a right angle bend; High suction lift; Local blockage or impeller defect of bottom valve, pipeline and impeller; The water outlet pipe leaks seriously. Troubleshooting: restore the rated speed, remove the belt oil dirt and adjust the belt tightness; Adjust the blade angle, reduce the installation position of the water pump, shorten the pipeline or change the curvature of the pipeline; Seal the air leakage of the water pump and compress the packing; Remove the blockage and replace the impeller; Replace the leakage reducing ring and plug the water leakage.

4. Can't absorb water

The reason is that there is air in the pump body or air accumulated in the water inlet pipe, or the bottom valve is not closed tightly, the filling water is insufficient, the packing of the vacuum pump leaks seriously, and the gate valve or flap valve is not closed tightly. Troubleshooting: first raise the water pressure, then fill the pump body with water, and then start the machine. At the same time, check whether the check valve is tight and whether the pipeline and joint have air leakage. If air leakage is found, apply lubricating oil or blending paint on the joint after disassembly, and tighten the screws. Check the oil seal ring of the water pump shaft. If it is seriously worn, replace it with a new one. Water leakage or air leakage of pipeline. The nut may not be tightened during installation. If the leakage is not serious, cement can be applied at the place of air leakage or water leakage, or cement slurry mixed with asphalt oil. For temporary repairs, apply some wet mud or soft soap. If there is water leakage at the joint, the nut can be tightened with a wrench. If the water leakage is serious, it must be disassembled and disassembled again and the cracked pipe must be replaced; Reduce the head and press the nozzle of the water pump into the water for 0.5m.

5. Violent vibration

There are mainly the following reasons: the electric rotor is unbalanced; Poor coupling connection; Bearing wear and bending; Loose and broken parts of rotating parts; The pipeline support is not firm. Adjustment, repair, reinforcement, straightening and replacement can be adopted respectively. The above conditions are the common causes of pump failure, not all of them. In practice, when dealing with the failure, due to the actual analysis, the principle of "outside first and then inside" should be followed, and blind operation should not be allowed.

6. Supporting power motor overheating

There are four reasons. First, the reasons for power supply: the voltage is high or low. Under specific load, if the voltage variation range should be beyond + 10% to - 5% of the rated value, the motor will overheat; The three-phase voltage of the power supply is asymmetric, and the phase to phase imbalance of the three-phase voltage of the power supply exceeds 5%, which will lead to overheating of the winding; Lack of phase operation. Experience shows that more than 85% of the burned agricultural motors are caused by lack of phase operation. Lack of phase protection devices shall be installed on the motors. Second, the reasons for the water pump: the power is not matched, the small horse pulls the cart, and the motor runs overload for a long time, which makes the motor temperature too high; The motor with too frequent startup and short-time or intermittent working system shall work continuously.

The starting times shall be limited, the thermal protection shall be correctly selected and used according to the rated value on the motor. The third reason is the motor itself: the connection method is wrong, and the △ shape is wrongly connected into Y shape, which makes the temperature of the motor rise rapidly; Stator winding has phase to phase short circuit, turn to turn short circuit or local grounding. In case of light, the motor is overheated locally, and in case of serious, the insulation is burned out; The squirrel cage rotor is broken or defective, and the iron core temperature rises rapidly when the motor runs for 1 to 2 hours; If the ventilation system fails, check whether the fan is damaged, whether the rotation direction is correct and whether the ventilation duct is blocked; Bearing wear and rotor eccentric bore sweeping make the stator and rotor iron cores rub against each other and produce metal impact sound. The iron core temperature rises rapidly. In serious cases, the motor smokes and even the coil is burned. Fourth, the reasons for the working environment: the motor winding is damp or dust and oil stain are attached to the winding, resulting in reduced insulation. The insulation resistance of the motor shall be measured and cleaned and dried; The ambient temperature is too high. When the ambient temperature exceeds 35 ℃, the high inlet air temperature will make the temperature of the motor too high. Try to improve its working environment. Such as putting up a shed for sunshade, etc. Note: in case of failure due to electrical reasons, electricians with professional qualification certificates shall be invited for maintenance. People with a little knowledge shall not repair blindly to prevent personal injury accidents.

7. Deep well submersible pump does not feed water or the water volume is small

First, look at the difference between the current of the water pump running at this time and the current of normal operation. If it is smaller than the normal operation (basically 2 \ 3 of the normal current), there will be problems such as impeller wear and blockage of the check valve at the top of the pump head. If the current is as large as usual, it is the leakage of pipe pad, pipe and pump body. If the current is greater than that during normal operation, it can be basically determined that it is the wear of vulnerable parts. In addition, if the cable is damaged, the water volume is as large as usual, but the current will become larger. The current of three 380V motors is generally 2.2A. The above reasons can be found by the repairman who often maintains the deep well pump.