Submersible pumps are often damaged by water shortages in the pool. In view of this situation, today you sort out the submersible pump several protection measures: water protection, motor leakage protection, oil chamber leakage protection, insulation resistance protection, winding overheating protection, bearing overheating protection.
1, prohibit the power supply voltage abnormal start
As the low-voltage power supply line is relatively long, the end of the line voltage is too low is common. When the phase voltage is below 198 volts, the line voltage is lower than 342 volts, submersible pump motor speed down, when less than 70% of the rated speed, start the centrifugal switch will be closed, resulting in a long start winding power and even burn Windings and capacitors. Conversely, a high voltage causes the motor to overheat and burn out the winding. Therefore, the submersible pump in operation, the operator must always observe the power supply voltage value, if less than 10% of the rated voltage, higher than 10% of rated voltage above, the motor should stop running, find out the cause and troubleshooting.
2, confirm the correct direction of rotation of the motor
Should find out the direction of rotation of the motor, there are many types of high-lift submersible pumps are forward and reverse when the water can be, but the reversal of small water, the current is large, the reversal of a long time will damage the motor windings.
3, cable installation and submersible pump insulation resistance requirements
Install the submersible pump, the cable to overhead, the power cord should not be too long. Submersible pump into the water or put forward not to force the cable to avoid breaking the power cord. Do not sink submerged pump in the mud, otherwise it will lead to bad motor cooling and burn motor winding. Installation, the motor insulation resistance should not be less than 0.5 megohm.
4, to avoid frequent switching
Do not frequently switch the submersible pump, this is because the pump will stop when the return flow, if immediately start, the motor load will start, resulting in too large starting current and burn the winding. Due to the large current at start-up, the frequent start-up also burns the submersible pump motor windings.
5, the installation of leakage protection
Leakage protector, also known as Pauling device, its role from the Pauling device these three words can be understood. Because the submersible pump in the water, easy to leakage caused by power loss or even lead to electric shock accident. If the leakage protector is installed, the leakage protector will cut off the power of the submersible pump to ensure the safety and avoid the leakage and waste of the electric energy as long as the leakage value of the submersible pump exceeds the operating current value of the leakage protector (usually not more than 30mA).
6, prohibit long-term overload pump work
In order to avoid the long-term overload of submersible pumps, do not draw large amounts of sediment water and observe whether the current value specified in the nameplate value, if the current is too large, should stop inspection. In addition, the dehydration pump running time should not be too long, so as not to make the motor overheating and burned.
7, focus on routine maintenance
Usually check the motor, if found under the cover of a crack, rubber seal ring damage or failure, should be replaced or repaired in order to prevent water penetration into the machine.
8, try to avoid low-voltage boot
If the voltage is too high, it will cause the motor to overheat and burn out the winding. If the voltage is too low, the motor speed will decrease. If it does not reach 70% of the rated speed, the centrifugal switch will close, causing the start winding Long-term power and heat or even burn out the winding and capacitors. Do not frequently switch the motor, this is because the pump will stop when the return flow, if the immediate start, the motor load will start, resulting in starting current is too large and burn out the winding.
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