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China1. Install a leakage protector
Leakage protector is also called life-saving device, and its function can be understood from the three words "life-saving device". Because the submersible pump works underwater, it is easy to leak electricity and cause power loss and even cause 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 no more than 30 mA), the leakage protector will cut off the power supply of the submersible pump to avoid leakage and waste energy and ensure safety.
Leakage protector is also called life-saving device, and its function can be understood from the three words "life-saving device". Because the submersible pump works underwater, it is easy to leak electricity and cause power loss and even cause 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 no more than 30 mA), the leakage protector will cut off the power supply of the submersible pump to avoid leakage and waste energy and ensure safety.
2. Don't turn on the machine if the power supply voltage is abnormal
Due to the relatively long low-voltage power supply lines in rural areas, it is common for the terminal voltage of the line to be too low. When the phase voltage is lower than 198V and the line voltage is lower than 342V, the motor speed of the submersible pump will decrease. When it does not reach 70% of the rated speed, the centrifugal switch will be turned on, causing the starting winding to be energized for a long time and cause heat or even burnout. Windings and capacitors. On the contrary, excessive voltage causes the motor to overheat and burn out the windings. Therefore, during the operation of the submersible pump, the operator must always observe the power supply voltage value. If it is less than 10% of the rated voltage and more than 10% of the rated voltage, the motor should be stopped to find out the cause and eliminate the fault.
Due to the relatively long low-voltage power supply lines in rural areas, it is common for the terminal voltage of the line to be too low. When the phase voltage is lower than 198V and the line voltage is lower than 342V, the motor speed of the submersible pump will decrease. When it does not reach 70% of the rated speed, the centrifugal switch will be turned on, causing the starting winding to be energized for a long time and cause heat or even burnout. Windings and capacitors. On the contrary, excessive voltage causes the motor to overheat and burn out the windings. Therefore, during the operation of the submersible pump, the operator must always observe the power supply voltage value. If it is less than 10% of the rated voltage and more than 10% of the rated voltage, the motor should be stopped to find out the cause and eliminate the fault.
3. Avoid frequent switching
Do not switch the submersible pump frequently. This is because the electric pump will produce backflow when it stops. If it is turned on immediately, the motor load will start, causing the starting current to be too large and the winding will burn out. Due to the large current when starting, frequent starting will also burn out the windings of the submersible pump motor.
Do not switch the submersible pump frequently. This is because the electric pump will produce backflow when it stops. If it is turned on immediately, the motor load will start, causing the starting current to be too large and the winding will burn out. Due to the large current when starting, frequent starting will also burn out the windings of the submersible pump motor.
4. Don't let the submersible electric pump be overloaded for a long time
In order to avoid long-term overloading of the submersible electric pump, do not pump water with a large amount of sand and observe whether the current value is at the value specified on the nameplate at any time. If the current is found to be too large, it should be shut down for inspection. In addition, the dehydration operation time of the electric pump should not be too long, so as to avoid overheating and burning of the motor.
In order to avoid long-term overloading of the submersible electric pump, do not pump water with a large amount of sand and observe whether the current value is at the value specified on the nameplate at any time. If the current is found to be too large, it should be shut down for inspection. In addition, the dehydration operation time of the electric pump should not be too long, so as to avoid overheating and burning of the motor.
5. The direction of rotation of the motor should be correct
The direction of rotation of the motor should be clarified. There are many types of submersible pumps that can produce water during forward 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 windings will be damaged.
The direction of rotation of the motor should be clarified. There are many types of submersible pumps that can produce water during forward 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 windings will be damaged.
6. Cable installation and insulation resistance requirements of submersible electric pumps
When installing the submersible pump, the cable should be overhead and the power cord should not be too long. When the submersible pump is launched into the water or raised, do not apply force to the cable to avoid breaking the power cord. Do not sink into the mud when the submersible pump is working, otherwise it will cause poor heat dissipation of the motor and burn out the motor windings. During installation, the insulation resistance of the motor should not be less than 0.5 megohm.
When installing the submersible pump, the cable should be overhead and the power cord should not be too long. When the submersible pump is launched into the water or raised, do not apply force to the cable to avoid breaking the power cord. Do not sink into the mud when the submersible pump is working, otherwise it will cause poor heat dissipation of the motor and burn out the motor windings. During installation, the insulation resistance of the motor should not be less than 0.5 megohm.
7. Check diligently and see if the problem is found to be repaired in time
Always check the motor frequently. If cracks in the lower cover, damage or failure of the rubber sealing ring, etc. are found, they should be replaced or repaired in time to avoid water infiltration into the submersible pump.
Always check the motor frequently. If cracks in the lower cover, damage or failure of the rubber sealing ring, etc. are found, they should be replaced or repaired in time to avoid water infiltration into the submersible pump.
.jpg?imageView2/2/w/326/h/326/format/jpg/q/75 "Q submersible pump")
.jpg?imageView2/2/w/326/h/326/format/jpg/q/75 "LSA automatic cold and hot self-priming pump-(2)")
