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1. Avoid ungrounded
It is a national mandatory standard to adopt protective grounding for submersible pumps. Only by adopting protective grounding can the personal safety during use be ensured. If there is no protective grounding, once the casing leaks electricity, the water at the water outlet of the submersible pump and the surface of the pumped water will be charged, endangering the safety of humans and animals, and at the same time wasting a lot of electricity. If the metal casing of the submersible pump is grounded with a grounding body that conforms to the national standard (grounding resistance is not greater than 4Ω), when the casing of the submersible pump leaks, the current flows through the metal casing of the submersible pump, the protective grounding wire, the grounding body, the earth, and the work of the transformer. The grounding wire and the power supply form a closed loop. When the leakage current is too large, especially when the live wire touches the shell, the protection device of the submersible pump can be activated (fuse blown or air switch tripped) to cut off the power supply of the leakage submersible pump.
2. Do not install a leakage protector
The 3.5" Submersible Pump works in the water, and it is easy to leak electricity and cause power loss or 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 supply of the submersible pump.
3. Avoid turning on when the power supply voltage is abnormal
If the voltage is too high or too low, the temperature of the submersible pump will rise too high, shorten the service life or even burn the submersible pump. Due to the relatively long low-voltage power supply lines in rural areas, it is common that the voltage at the end of the line is too low and the voltage at the starting end is too high. Therefore, in the process of using the submersible pump, the operator must observe the power supply voltage value at any time. If it is less than 10% of the rated voltage, more than 10% higher than the rated voltage, or the current is greater than 20% of the rated current of the submersible pump, immediately Shutdown, and avoid starting when the power supply voltage is abnormal.
4. Avoid rotating the motor in the opposite direction
There are many types of submersible pumps that can produce water in both forward and reverse rotations, but the water output is small and the current is large during reverse rotation, and the motor windings will be damaged if the reverse rotation time is too long. Therefore, the submersible pump should be connected to the power supply before entering the water to check whether the rotation direction is correct. If the impeller of the three-phase submersible pump is reversed, it should be stopped immediately, and the wiring of any two phases in the three-phase core wire in the cable can be exchanged.
5. Avoid long-term overload work
In order to avoid the long-term overloading of the submersible pump, do not use the low-lift pump for high-lift work, do not pump water with large sand content (heavy mud), and observe whether the current value is within the specified range at any time. If it is found that the current is too large, it should be stopped for inspection. In addition, the submersible pump uses water as the cooling source, so the dehydration time of the submersible pump should not be too long.
6. Avoid frequent switching
The submersible pump should not be started too frequently, because the backflow will occur when the submersible pump is stopped. If the submersible pump is turned on immediately, the motor load will be started and the starting current will be too large. Therefore, after the shutdown, the water in the pipe must wait for the backflow of the water to be completed before it can be restarted, which generally requires an interval of about 5 minutes.
7. Avoid using in silt environment
If the submersible pump sinks into the mud during use, it will cause poor heat dissipation and burn out the motor windings. Therefore, submersible pumps must not be used in silt environments. In order to prevent the submersible pump from sinking into the mud, the working environment of the submersible pump should be muddy before it is launched. When conditions permit, the submersible pump should be covered with a fence shield to avoid waste from blocking the water inlet fence, causing the motor to heat up, Poor water flow.
8. Do not leave it in water for a long time after discontinuation
If the submersible pump is not used continuously after going down the well, it will corrode for a long time, resulting in failure to start. Therefore, the deactivated submersible pump should not be left in the water and should be turned on once a week for 5-10 minutes. When it is not used for a long time, it should not be immersed in water for a long time. It should be placed in clean water and powered on for a few minutes to clean the mud inside and outside the pump, then lift the water surface to dry it, and conduct a major inspection. Disassemble all parts for maintenance, scrubbing, rust removal and descaling , Replace the wearing parts, reassemble them, paint and prevent rust, and put them in a dry, non-corrosive gas warehouse.
