When the submersible pump is working, the entire pump body and motor are in the liquid. The following are some methods to extend the service life of the submersible pump:
1. Confirm the correct rotation direction of the motor
The rotation direction of the motor should be clarified. There are many types of submersible pumps that can produce water in both forward and reverse directions, but the water output is small and the current is high in reverse. If the reverse time is long, it will damage the motor winding.
2. Prohibit abnormal power supply voltage startup
Due to the long length of low-voltage power supply lines, it is common for the terminal voltage of the lines to be too low. When the phase voltage is lower than 198 volts and the line voltage is lower than 342 volts, the speed of the submersible pump motor decreases. When it does not reach 70% of the rated speed, the centrifugal switch will close, causing the starting winding to be energized for a long time and generate heat or even burn out the winding and capacitor.
On the contrary, excessive voltage can cause the motor to overheat and burn out the windings. Therefore, during the operation of the submersible pump, the operator must observe the power supply voltage value at all times. If it is below 10% of the rated voltage and above 10% of the rated voltage, the motor should be stopped to identify the cause and eliminate the fault.
3. Cable installation and insulation resistance requirements for submersible pumps
When installing a submersible pump, the cable should be overhead and the power line should not be too long. When diving or lifting the submersible pump, do not put force on the cable to avoid causing the power line to break. When the submersible pump is working, do not sink into the mud, otherwise it may cause poor heat dissipation of the motor and burn out the motor winding. During installation, the insulation resistance of the motor should not be less than 0.5 megohms.
4. Installation of leakage protector
Leakage protector, also known as life protector, can be understood from the three words "life protector". Because submersible pumps work underwater, they are prone to electrical leakage, which can cause energy loss and even lead to electric shock accidents. If a leakage protector is installed, as long as the leakage value of the submersible pump exceeds the operating current value of the leakage protector (generally not exceeding 30mA), the leakage protector will cut off the power supply of the submersible pump to ensure safety and avoid leakage and energy waste.
5. Avoid frequent switching
Do not frequently turn on and off the submersible pump, as it will generate backflow when the electric pump stops. If it is turned on immediately, it will cause the motor load to start, resulting in excessive starting current and burning out the winding. Due to the high current during startup, frequent startups can also burn out the windings of the submersible pump motor.
6. Do not let the submersible pump work under overload for a long time
To avoid long-term overload operation of submersible electric pumps, do not pump water with high sediment content and observe whether the current value is within the specified value on the nameplate at any time. If excessive current is found, stop the machine for inspection. In addition, the dehydration operation time of the electric pump should not be too long to avoid overheating and burning out the motor.
7. Pay attention to daily maintenance
Regularly check the motor. If cracks are found on the lower cover, damaged or ineffective rubber sealing rings, etc., they should be replaced or repaired in a timely manner to avoid water infiltration into the submersible pump.
Pay attention to the use of submersible pump protectors and some daily protection measures, which can better extend the service life of submersible pumps.
