How To Prolong The Service Life Of Sewage Pump

Dec 20, 2021

1. Abnormal power supply voltage is prohibited

Due to the long low-voltage power supply line, it is common that the terminal voltage of the line is too low. When the phase voltage is lower than 198 V and the line voltage is lower than 342 V, the speed of the sewage pump motor decreases. When it does not reach 70% of the rated speed, the starting centrifugal switch will be closed, resulting in heating and even burning of the winding and capacitor after the starting winding is energized for a long time. On the contrary, too high voltage causes the motor to overheat and burn out the winding. Therefore, during the operation of the equipment, the operator must observe the power supply voltage at any time. If it is less than 10% lower than the rated voltage and more than 10% higher than the rated voltage, stop the motor, find out the cause and eliminate the fault.

2. Confirm the correct rotation direction of the motor

It should be clear about the rotation direction of the motor. At present, many types of sewage pumps can discharge water during forward rotation and reverse rotation, but the water output is small and the current is large during reverse rotation. If the reverse time is long, the motor winding will be damaged.

3. Installation of leakage protector

Leakage protector is also called life protector. Its function can be understood from the three words "life protector". Because the equipment works underwater, it is easy to leak electricity, resulting in power loss and even electric shock. If a leakage protector is installed, as long as the leakage value of the equipment exceeds the action current value of the leakage protector (generally no more than 30 MA), the leakage protector will cut off the power supply to ensure safety and avoid leakage and waste of electric energy.

4. Insulation resistance requirements for cable installation and submersible pump

During installation, the cable shall be overhead and the power line shall not be too long. Do not force the cable when launching or lifting the equipment, so as to avoid breaking the power cord. Do not sink into the mud when the equipment is working, otherwise it will cause poor heat dissipation of the motor and burn out the motor winding. During installation, the insulation resistance of the motor shall not be less than 0.5 megohm.

5. Avoid frequent switching

Do not switch on and off the sewage pump frequently, because backflow will occur when the electric pump stops running. If it is started immediately, the motor load will start, resulting in excessive starting current and burning out the winding. Due to the large current during startup, frequent startup will also burn out the motor winding of the equipment.

6. Do not let the equipment work overload for a long time

7. In order to avoid long-term overload operation of the equipment, do not pump water with large sand content, and observe whether the current value is the value specified on the nameplate at any time. If the current is found to be too large, stop the machine for inspection. In addition, the dewatering operation time of the water pump should not be too long to avoid overheating and burning of the motor.

7. Pay attention to daily maintenance

The motor shall be checked frequently at ordinary times. In case of cracks on the lower cover, damage or failure of the rubber sealing ring, it shall be replaced or repaired in time to avoid water infiltration into the sewage pump.