Precautions for using submersible sewage pumps

How to maintain the submersible sewage pump? In daily life, paying attention to the daily maintenance of the 

submersible sewage pump can effectively extend the service life of the submersible sewage pump.

The specific details are as follows

1. Determine the correct direction of motor rotation

The direction of rotation of the motor should be clarified. Nowadays, there are many types of submersible sewage

pumps that can discharge water when rotating forward or rotating. However, the water output is small and the current 

is large when rotating. If the rotation time is long, the motor windings will be damaged.

2. Prevent frequent switching

Do not switch the submersible pump on and off frequently. This is because backflow will occur when the electric pump stops. 

If it is started immediately, the motor load will start, causing the starting current to be too large and burning the windings.

 Because the current is very large when starting, frequent starting will also burn out the motor windings of the submersible sewage pump.

3. Insulation resistance requirements for cable devices and submersible sewage pumps

When installing a submersible sewage pump, the cables should be overhead and the power cord should not be too long. 

Do not put stress on the cable when launching or lifting the submersible sewage pump to prevent the power cord from cracking.

 Do not sink into the mud when the submersible pump is operating, otherwise it will cause poor heat dissipation of the motor 

and burn out the motor windings. When installed, the insulation resistance of the motor should not be less than 0.5 megohms.

4. Prevent abnormal power supply voltage startup

Because low-voltage power supply lines are relatively long, it is common for the voltage at the end of the line to be too low. 

When the phase voltage is lower than 198 volts and the line voltage is lower than 342 volts, the submersible sewage pump 

motor speed decreases. When it does not reach 70% of the rated speed, the starting centrifugal switch will close, causing the 

starting winding to be energized for a long time and generate heat and even burn out the winding and capacitor. On the contrary, 

too high voltage causes the motor to overheat and burn out the windings. Therefore, when the submersible sewage pump is in 

operation, the operator must check the power supply voltage value at any time. If it is less than 10% lower than the rated voltage 

and more than 10% higher than the rated voltage, the motor should be stopped to find out the cause and eliminate the fault.

5. Installation of leakage protector

The leakage protector is also called a life-saving device. Its effect can be understood from the three words "life-saving device". 

Because the submersible sewage pump operates underwater, it is easy to leak electricity, cause loss of power, and even cause 

electric shock accidents. If a leakage protector is installed, as long as the leakage value of the submersible sewage pump exceeds 

the operating current value of the leakage protector (usually no more than 30 mA), the leakage protector will cut off the power 

supply of the submersible pump to ensure safety and prevent leakage and waste of electric energy.

6. Pay attention to daily maintenance

The motor should be checked frequently. If cracks are found on the lower cover or the rubber sealing ring is damaged or failed, 

it should be replaced or repaired in time to prevent water from entering the submersible pump.

7. Do not allow the submersible sewage pump to be overloaded for a long time.

In order to prevent the submersible electric pump from being overloaded for a long time, do not pump water with a large sand 

content and check whether the current value is the value specified on the nameplate at any time. If the current is found to be too 

high, stop the pump for inspection. In addition, the dehydration operation time of the electric pump should not be too long to 

avoid overheating and burning of the motor.