Installation key points of submersible pumps
The submersible pump is small and light. In order to avoid accidents during use, prolong the service life and exert its excellent performance, pay attention to the following six points when using:
1. Install the leakage protector. The leakage protector is also called life protector. Its function can be understood from the three words "life protector". Because the submersible pump works underwater, it is easy to leak electricity and cause power loss and even cause electric shock accidents. 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 to avoid leakage and waste energy and ensure safety.
2. Don't start the machine if the power supply voltage is abnormal. Because the low-voltage power supply line is relatively long in rural areas, it is common for the end voltage of the line to be too low. When the phase voltage is lower than 198V and the line voltage is lower than 342V, the motor speed of the submersible pump will decrease. When it does not reach 70% of the rated speed, the centrifugal switch will be turned on, causing the starting winding to be energized for a long time and heat or even burn Windings and capacitors. On the contrary, excessive voltage causes the motor to overheat and burn out the windings. Therefore, during the operation of 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 or more than 10% of the rated voltage, the motor should be stopped to find the cause and eliminate the fault.
3. Avoid frequent switching. Don't switch the submersible pump frequently. This is because when the electric pump stops, it will produce backflow. If it is turned on immediately, the motor load will start, which will cause excessive starting current and burn out the windings. Due to the large current when starting, frequent starting will also burn out the windings of the submersible pump motor.
4. Do not allow the submersible electric pump to be overloaded for a long time. In order to avoid long-term overloading of the submersible electric pump, do not pump water with a large amount of sand and observe whether the current value is at the value specified on the nameplate at any time. If the current is too large, stop it. an examination. In addition, the dehydration operation time of the electric pump should not be too long, so as to prevent the motor from overheating and burning.
5. The direction of rotation of the motor should be correct. The direction of rotation of the motor should be understood. There are many types of submersible pumps that can produce water during forward and reverse rotation, but when reverse rotation, the water output is small, the current is large, and the reverse time is long. Will damage the motor windings.
6. Cable installation and insulation resistance requirements of submersible pumps When installing submersible pumps, the cable should be overhead and the power cord should not be too long. When the submersible pump is launched or raised, do not apply force to the cable 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. During installation, the insulation resistance of the motor should not be less than 0.5 megohm.
