Small submersible pump use matters needing attention

　　Small submersible pumpPrecautions for use

Small submersible pump is small and light, can not be separated from farmland irrigation and farmers water. In order to avoid accidents during use, extend service life, and give full play to its excellent performance, the following seven points should be paid attention to when using:

1. Do not turn on the small submersible pump when the power supply voltage is abnormal

Due to the long low-voltage power supply line in rural areas, it is a common phenomenon that the terminal voltage of the line is low. When the phase voltage is lower than 198 volts and the line voltage is lower than 342 volts, the motor speed of the submersible pump is continuously decreasing. When the rated speed is lower than 70%, the start centrifugal switch is closed, causing the start winding to be heated for a long time, and even the winding and capacitor are burned out. Conversely, excessive voltage can cause a motor to overheat and burn out or the windings. Therefore, during the operation of the submersible pump, the operator must observe the voltage value of the power supply at any time. When the voltage is lower than 10% of the rated voltage and the rated voltage exceeds 10%, the motor should be stopped to find out the cause and eliminate the fault.

2. Install leakage protector

The residual current protector is also called a lifeguard. Its role can be understood from the word "lifeguard. Because the submersible pump works under water, it is prone to leakage, and may even cause electric shock accidents. If a leakage protector is installed, as long as the leakage value of the submersible pump exceeds the working current value of the leakage protector (generally not more than 30mA), the leakage protector will cut off the power supply of the submersible pump. To avoid leakage and waste of electrical energy. Pay attention to safety. If the power supply voltage is less than 10% of the rated voltage and more than 10% of the rated voltage, stop the machine to find out the cause and eliminate the fault.

3. Avoid frequent switching

Do not switch the submersible pump frequently, because backflow will occur when the electric pump stops. If it can be started immediately, the motor load will be started, causing the company to start too much current and burn out the winding. Due to the large starting current in our country, frequent starting will burn out the motor winding of the submersible pump.

4, regular inspection, found that the problem timely repair

The motor should be checked frequently, and the cracked lower cover, damaged or damaged rubber sealing ring, etc. should be replaced in time to prevent water from penetrating into the submersible pump.

5. The rotation direction of the motor should be correct

The direction of rotation of the motor shall be specified. At present, there are many different types of submersible pumps, and the forward and reverse rotation problems can be released. However, the water output is small and the current is large during reverse rotation. If the reverse class time is not too long, the motor winding will be damaged.

　　6、Small submersible pumpCable installation and insulation resistance requirements

When installing the submersible pump, the cable should be overhead and the power line should not be too long. Do not pull the cable when the submersible pump enters or carries water, so as not to break the power cord. When the submersible pump is working, do not sink into the mud, otherwise it will affect the heat dissipation of a motor and burn the motor control winding. The insulation resistance of the motor during installation shall not be less than 0.5 megohms.

7, do not letSmall submersible pumpLong working hours

In order to avoid the long-term overload teaching work of the submersible pump, do not pump water with large sediment concentration, and often observe whether the current value on the nameplate of the equipment is on the nameplate. If the current is found to be too high, the inspection should be stopped. In addition, the dehydration operation time of the electric pump should not be too long to avoid overheating and burning of the motor.