First, when choosing a submersible pump, pay attention to its model, flow and head. If the selected specifications are not appropriate, it will not be possible to obtain sufficient water output and the unit's efficiency will not be achieved. In addition, the direction of rotation of the motor should also be known. Some types of submersible pumps can produce water when they are rotating forwards and backwards. However, when the reverse rotation is small and the current is large, the reversal of the motor will damage the motor windings. In order to prevent leakage when the submersible pump is operating underwater, an electrical leakage protection switch should be installed.
Second, when installing the submersible pump, the cable should be overhead and the power cable should not be too long. Do not apply force to the cables when the unit is in water, as this may cause the power cord to break. The submersible pump should not sink into the mud, otherwise it will lead to poor heat dissipation and burn out the motor windings.
Third, try to avoid booting at low pressure. The power supply voltage and rated voltage must not differ by 10%. If the voltage is too high, the motor will overheat and the winding will burn out. If the voltage is too low, the motor speed will drop. If the rated speed is less than 70%, the starting centrifugal switch will close, causing the starting winding. Prolonged energization generates heat and even burns out the windings and capacitors. Do not switch the motor on and off frequently. This is because when the electric pump stops rotating, it will generate back flow. If it is turned on immediately, the load of the motor will start, causing the starting current to be too large and the winding to burn out.
Fourth, do not let the pump long-term overload operation, do not pump water containing large amounts of sand, electric pump dehydration time should not be too long, so as not to make the motor overheated and burned. During the operation of the unit, the operator must observe at any time whether its working voltage and current are within the values specified on the nameplate. If it does not meet the requirements, the motor should be stopped, the cause must be found out and the fault should be eliminated.
Fifth, usually more than check the motor, if found under the cover cracks, rubber seal ring damage or failure, etc., should be promptly replaced or repaired to prevent water penetration into the machine.
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