1. Unable to start
Firstly, the power supply situation should be checked: whether the connector connection is secure; Check if the switch contacts are tight; Is the fuse blown; Is the three-phase power supply lacking equality. If there is an open circuit, poor contact, blown fuse, or missing phase, the cause should be identified and repaired in a timely manner. Secondly, check if it is a mechanical failure of the water pump itself. Common causes include: tight packing or blockage between the impeller and the pump body due to debris; The pump shaft, bearings, and leakage reducing ring are rusted; The pump shaft is severely bent, etc. Exclusion method: Relax the filling and dredge the drainage channel; Disassemble the pump body to remove debris and rust; Remove the pump shaft for calibration or replace it with a new one.
2. The supporting power motor is overheated
There are four reasons. One reason is due to power supply: the voltage is too high or too low. Under specific loads, if the voltage fluctuation range should be outside the rated value of+10% to -5%, it will cause the motor to overheat; The three-phase voltage of the power supply is asymmetric, and the imbalance between the three-phase voltage of the power supply exceeds 5%, which can cause the winding to overheat; Lack of phase operation, experience has shown that over 85% of the burning of agricultural motors is caused by lack of phase operation. Therefore, it is necessary to install a lack of phase protection device for the motor. The second reason is for the water pump: the selection of power is not matched, the small horse pulls the big car, and the electric motor runs overload for a long time, causing the temperature of the electric motor to be too high; Electric motors that start too frequently and have a rated short-term or intermittent working system operate continuously. The number of starts should be limited, thermal protection should be selected correctly, and used according to the rated values specified on the motor. The third reason is due to the motor itself: incorrect connection, mistakenly connecting the △ shape to the Y shape, causing the temperature of the motor to rapidly rise; The stator winding has phase to phase short circuit, turn to turn short circuit, or local grounding. In mild cases, the motor may overheat locally, and in severe cases, the insulation may be burned out; The squirrel cage rotor has broken bars or defects, and the motor runs for 1 to 2 hours, causing a rapid increase in core temperature; If there is a malfunction in the ventilation system, it is necessary to check whether the fan is damaged, whether the rotation direction is correct, and whether the ventilation ducts are blocked; Wear of bearings and eccentric cleaning of the rotor cause the iron cores of the stator and rotor to rub against each other and produce a metallic impact sound. The temperature of the iron core rapidly rises, and in severe cases, the motor may smoke or even the coil may be burned out. The fourth reason is due to the working environment: the motor winding is affected by moisture, dust, oil stains, etc., which adhere to the winding, resulting in a decrease in insulation. The insulation resistance of the motor should be measured and cleaned and dried; The ambient temperature is too high. When the ambient temperature exceeds 35 ℃ and the inlet air temperature is high, it will cause the temperature of the motor to be too high. Efforts should be made to improve its working environment. Such as setting up a shed for shading. Attention: If a malfunction occurs due to electrical reasons, it should be repaired by an electrician who has obtained a professional qualification certificate. People with only a limited understanding should not blindly repair to prevent personal injury accidents.
3. Heat generated by water pump
Reason: Bearing damage; The clearance between rolling bearings or bracket covers 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, causing the impeller to lose balance and increasing the thrust towards one side. Troubleshooting method: 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; Adjust the tightness of the tape appropriately; Add clean butter, which accounts for about 60% of the clearance inside the bearing; Remove blockages from the balance hole.
4. Insufficient traffic
This is because: the power speed is not matched or the belt slips, resulting in a low speed; The installation angle of the axial flow pump blades is too small; Insufficient head, too long pipeline or right angle bend in the pipeline; High suction head; Local blockage or impeller defect in the bottom valve, pipeline, and impeller; The water outlet pipe is leaking severely. Troubleshooting method: Restore the rated speed, remove belt oil stains, and adjust the belt tightness; Adjust the blade angle, lower the installation position of the water pump, shorten the pipeline or change the curvature of the pipeline; Seal the leak of the water pump and tighten the packing; Remove blockages and replace impellers; Replace the leak reducing ring and block the leaking area.
5. Unable to absorb water
The reason is that there is air in the pump body or air accumulation in the inlet pipe, or the bottom valve is not tightly closed, the water supply is insufficient, the vacuum pump packing is severely leaking, and the gate valve or flap door is not tightly closed. Troubleshooting method: First increase the water pressure, then fill the pump body with water, and then turn on the machine. At the same time, check whether the check valve is tight and whether there is any leakage in the pipeline and joints. If any leakage is found, apply lubricating oil or blending paint to the joint after disassembly, and tighten the screws. Check the oil seal ring of the water pump shaft. If it is severely worn, replace it with a new one. Pipeline leaks water or air. The nut may not be tightened tightly during installation. If the leakage is not severe, cement can be applied to the leaking or leaking area, or cement slurry mixed with asphalt oil can be applied. Temporary repairs can be done with damp mud or soft soap. If there is water leakage at the joint, a wrench can be used to tighten the nut. If the leakage is severe, it must be disassembled and replaced with a cracked pipe; Reduce the head and press the nozzle of the water pump 0.5m underwater.
6. Severe vibration
There are several main reasons: unbalanced electric rotor; Poor coupling connection; Wear and bending of bearings; Loose or cracked rotating parts; Due to reasons such as loose pipeline supports. Measures such as adjustment, repair, reinforcement, straightening, and replacement can be taken separately.
