Could not start:
First, we should look at the power supply situation: the joint connection is not reliable; switch contact is not close; the fuse is not fuse; three-phase power supply is not equal. Such as open circuit, poor contact, fuse, phase, reason should be identified and promptly repaired.
Second view is not a mechanical problems of the pump itself, the common reasons are: packing too tight or between the impeller and the pump body is stuck with debris and jam; pump shaft, bearings, reducing leakage ring rust live; pump shaft, such as severe twists and turns. Cleaning method: relax fill, dredge flume; disassemble pump body to remove debris, rust; remove pump shaft correction or replacement of the pump shaft.
Auxiliary power motor overheating:
For four reasons. One is the power of reason: high or low voltage and under a certain load, if the voltage fluctuation range in the rating of + 10% to - 5% outside will resulting in motor overheating; power three-phase voltage is unbalanced, three-phase power supply voltage of phase imbalance degree exceed 5%, lead winding overheating; phase lack operation, experience shows agricultural motor burned more than 85% is due to the lack of phase caused by the operation of, response to motor installation phase lack protection device. Second is the cause of the water pump: use power not complete, a small horse drawn carts, motor overload a long time running, the motor temperature high; start too frequent, quota of short-term or intermittent duty motor work continuously. The starting times should be restrained, the correct selection of thermal protection, according to the fixed use of motor calibration. Smoke hit a local fault of a motor's own reason: connection, triangle shape error connection into a Y shape, the motor temperature rise rapidly; stator winding interphase short circuit, winding inter turn short circuit or local grounding, light motor overheating, severe burn insulation; squirrel cage rotor broken bar or the existence of defects, the motor running 1 to 2 hours, the core temperature rises rapidly; ventilation system problems, should check the fan is not damaged, the rotation direction is not correct, the ventilation duct is not blocked; bearing wear, rotor eccentricity sweep bore of stator and rotor core rubbed a metallic sound, core temperature rises rapidly, severe motor and coil burned. Four is the reason for the working environment: the motor winding damp or dust, oil and other attached to the winding, resulting in reduced insulation. The insulation resistance of the motor should be measured and cleaned and dried; the environment temperature is too high. When the ambient temperature exceeds 35 degrees Celsius, the air temperature is high, the temperature of the motor is too high, so we should try to improve the working environment. Such as scaffolding shade.
Special remind: problems occur due to the reason of electric, please obtain a professional qualification certificate of electrician, a smattering of other people not blindly maintenance to prevent the occurrence of accidents.
