Use and maintenance of submersible pumps
Issuing time:2022-12-24 09:00
Submersible pumps often burn out the motor windings due to lack of water in the pool. In view of this situation, several submersible pump protection measures are organized for everyone: water shortage protection, motor water leakage protection, oil chamber water leakage protection, insulation resistance protection, bearing overheating protection, etc. .
Determine the correct direction of rotation for the motor.
We should find out the direction of rotation of the motor. At present, high-lift submersible pumps can discharge water when they are in forward and reverse directions, but when they are reversed, the water output is small, the current is large, and the motor windings will be damaged if the reverse time is long.
Submersible pump wire installation and insulation resistance requirements.
When installing the submersible pump, the power cord should be overhead and should not be too long. When the submersible pump is launched or raised, do not apply force to the power cord 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. When installing, the insulation resistance of the motor shall not be less than 0.5 megohm.
Avoid frequent switching.
Do not switch the submersible pump frequently, because backflow will be generated when the electric pump stops. If it is started immediately, the motor load will start, causing the starting current to be too large, and the winding will be burned. Due to the large current when starting, frequent starting will also burn out the motor windings of the submersible pump.
Install a leakage protector.
Leakage protector is also called life protector. Submersible pumps work underwater and are prone to electric leakage, resulting in power loss or even electric shock accidents. If a leakage protector is installed, as long as the operating current value of the leakage protector of the submersible pump is reached, the leakage protector should cut off the power supply of the submersible pump to ensure safety and avoid leakage and power waste.
It is forbidden to overload the submersible pump for a long time.
In order to avoid long-term overloading of the submersible pump, do not pump water with high sand content at any time, and observe whether the current value on the nameplate is specified. If the current is found to be too large. The inspection should be stopped. In addition, the dehydration time of the electric pump should not be too long, so as to avoid the motor from overheating and burning out.
Pay attention to school maintenance.
Check the motor, if the lower cover has cracks, the rubber sealing ring is damaged or faulty, it should be replaced or repaired in time to prevent water from penetrating into the machine.
Try to avoid low voltage starting.
The power supply voltage must not differ by 10% from the rated voltage. Too much voltage can cause the motor to overheat and burn out the windings. If the voltage is too low, the motor speed will drop. If it cannot reach 70% of the rated speed, the starting centrifugal switch will be closed, causing the starting winding to be energized for a long time, heating, and even burning the winding and capacitor. Do not switch the motor frequently. Because backflow occurs when the electric pump stops. If it starts immediately, the motor load will start, causing the starting current to be too large, and the winding will burn out.
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