Submersible pump use precautions
[Installation of leakage protector]
The leakage protector is also called a life-saving device, and its function can be understood from the words "life-saving device". Because the submersible pump works underwater, it is easy to leak electricity and cause electric energy loss and even electric shock. If the 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 30 mA), the leakage protector will cut off the power supply of the submersible pump to avoid leakage of electricity and waste power to ensure safety.
[Power supply voltage is abnormally turned on]
In rural areas, because the low-voltage power supply line is relatively long, the terminal voltage at the end of the line is too 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 drops. When the rated speed is less than 70%, the centrifugal switch will be closed, causing the starting winding to be energized for a long time and even burned out. Windings and capacitors. Conversely, a voltage that is too high causes the motor to overheat and burn out the winding. Therefore, in the operation of the submersible pump, the operator must observe the power supply voltage value at any time. If it is lower than the rated voltage by 10% or less and higher than the rated voltage by more than 10%, the motor should be stopped, the cause should be found and the fault should be eliminated.
[Avoid frequent switching]
Do not switch the submersible pump frequently. This is because the recirculation occurs when the electric pump is stopped. If it is turned on immediately, the motor load will start, causing the starting current to be too high and the winding to be burned out. Due to the large current at start-up, frequent start-up will also burn the submersible pump motor windings.
[Do not let the submersible pump work for a long time]
In order to avoid long-term overload operation of the submersible pump, do not pump water with a large amount of sand and observe whether the current value is on the nameplate. If it is found that the current is too large, stop the inspection. In addition, the dehydration operation time of the electric pump should not be too long, so as to prevent the motor from overheating and burning.
[The direction of rotation of the motor is correct]
The direction of rotation of the motor should be clarified. There are many types of submersible pumps that can discharge water during forward and reverse rotation. However, when reversing, the water output is small and the current is large. If the reversal time is long, the motor winding will be damaged.
[Cable line installation and insulation resistance requirements of submersible pumps]
When installing the submersible pump, the cable should be overhead and the power cord should not be too long. Do not force the cable when the submersible pump is launched or raised, so as not to cause the power cord to break. Do not sink into the mud when the submersible pump is working, otherwise it will cause poor heat dissipation of the motor and burn the motor windings. When installed, the insulation resistance of the motor should not be less than 0.5 megohms.
[Diligent inspection, find problems and repair in time]
Always check the motor frequently. If the lower cover is cracked or the rubber seal ring is damaged or invalid, it should be replaced or repaired in time to prevent water from seeping into the submersible pump. Submersible pumps are used in domestic water, mine rescue, industrial cooling, farm irrigation, seawater lifting, ship transfer, and can also be used in fountain landscapes. Hot water submersible pumps are used for hot spring bathing. They can also be used to extract groundwater from deep wells. Rivers, reservoirs, canals and other water lifting projects. It is mainly used for irrigation of farmland and water for humans and animals in high mountainous areas. It can also be used for central air-conditioning cooling, heat pump units, cold pump units, cities, factories, railways, mines, and construction sites. The general flow rate is (10m3~650m3) per hour and the head can reach 1500 meters. Inclusion: The submersible pump is small and light, plays an important role in rural production and life, and should pay attention to the following points in use:
First, when purchasing a submersible pump, you should pay attention to its pump model, pump flow and pump lift. If the selected specifications are not appropriate, sufficient water output will not be obtained and the efficiency of the unit will not be utilized. In addition, you should also know the direction of rotation of the motor. Some types of submersible pumps can produce water when they are rotating forward and reverse. However, when the water is reversed, the water output is small and the current is large. The reverse rotation will damage the motor windings. In order to prevent electric shock caused by electric leakage when the submersible pump is working underwater, a leakage protection switch should be installed.
2. When installing the submersible pump, the cable should be overhead and the power cord should not be too long. Do not force the cable when the unit is launched, so as not to cause the power line to break. Do not sink the submersible pump into the mud, otherwise it will cause poor heat dissipation and burn the motor windings.
Third, try to avoid starting at low voltage. The power supply voltage and the rated voltage are not different by 10%. If the voltage is too high, the motor will overheat and the winding will be burned out. If the voltage is too low, the motor speed will drop. If the rated speed is less than 70%, the centrifugal switch will be closed, causing the starting winding. Powering up for a long time generates heat and even burns the windings and capacitors. Do not switch the motor frequently. This is because the recirculation occurs when the pump is stopped. If it is turned on immediately, the motor load will start, causing the starting current to be too high and the winding to burn out.
4. Do not let the submersible pump run for a long time. Do not pump water with a large amount of sand. The dehydration operation time of the submersible pump should not be too long, so as not to overheat the motor and burn it. During the operation of the unit, the operator must observe whether the working voltage and current are within the values ​​specified on the nameplate. If it does not meet the requirements, the motor should be stopped, find the cause and eliminate the fault.
5. Check the motor more than usual. If the lower cover is cracked or the rubber seal ring is damaged or invalid, it should be replaced or repaired in time to prevent water from seeping into the machine.
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