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What should you pay attention to when using a small submersible pump?
- Dec 10, 2018 -

First, install the leakage protector

The leakage protector is also called the life-saving device. 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 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 of the submersible pump to avoid leakage of electricity and waste power to ensure safety.

Second, ensure the power supply voltage

In rural areas, the low voltage supply line is relatively long, and the end voltage 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 turned on, causing the starting winding to be energized for a long time, and even burned. Bad windings and capacitors. Conversely, a voltage that is too high causes the motor to overheat and burn out the windings. 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.

Third, avoid frequent switching

Do not switch the submersible pump 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. Due to the large current at start-up, frequent start-up will also burn the submersible pump motor windings.

Fourth, 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 at any time. If the current is too large, stop the machine. In addition, the dehydration operation of the electric pump should not be too long to prevent the motor from overheating and burning. At the same time, the direction of rotation of the motor should be correct to understand the direction of rotation of the motor. There are many types of submersible pumps that can discharge water during forward and reverse rotation, but the water output is small and the current is large when the inverter is reversed. Damage to the motor windings.

Five, cable 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. The insulation resistance of the motor should not be less than 0.5 megohms during installation. Diligently check and 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.

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