The submersible sewage pump can be understood from the name that this is a sewage discharge equipment. When installing the sewage pump, first confirm the correct direction of rotation of the motor, and then prohibit the abnormal power supply voltage from starting, and the leakage protector. installation is very important.
1. Correct rotation direction of the motor
The rotation direction of the motor should be clarified. Now there are many types of submersible sewage pumps that can discharge water in both forward and reverse rotations, but the water output is small and the current is large during the reverse rotation. The long reversal time will damage the motor windings.
2. Abnormal power supply voltage
Because the low-voltage power supply line is relatively long, it is common for the voltage at the end of the line to be too low. When the phase voltage is lower than 198 volts and the line voltage is lower than 342 volts, the motor speed of the submersible sewage pump will drop. When it does not reach 70* of the rated speed, the start centrifugal switch will be closed, causing the start winding to be energized for a long time and heat up or even burn. Bad windings and capacitors.
On the contrary, the high voltage causes the motor to overheat and burn out the windings. Therefore, during the operation of the submersible sewage pump, the operator must observe the power supply voltage value at any time. If it is lower than 10* of the rated voltage and higher than 10* of the rated voltage, the motor should be stopped to find out the reason and eliminate the fault.
3. Cable installation and insulation resistance requirements of submersible sewage pump
When installing the submersible sewage pump, the cable should be overhead, and the power cable should not be too long. Do not apply force to the cable when the submersible sewage pump is launched or pulled out, so as not to cause the power cord to break. Do not sink into the mud when the submersible sewage pump is working, otherwise it will cause poor heat dissipation of the motor and burn the motor windings. During installation, the insulation resistance of the motor should not be lower than 0.5 megohms.
4. Installation of leakage protector
The leakage protector is also called a life saver, and its function can be understood from the three words "life saver". Because the submersible sewage pump works underwater, it is easy to leak electricity, resulting in power loss and even electric shock accidents. If a leakage protector is installed, as long as the leakage value of the submersible sewage 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 sewage pump to ensure safety and avoid leakage and waste. electrical energy.
5. Avoid frequent switching
Do not switch on and off the submersible sewage pump frequently, this is because the backflow will occur when the electric pump is stopped. If it is turned on immediately, the motor load will start, resulting in excessive starting current and burning out the windings. Due to the large current at startup, frequent startup will also burn out the motor windings of the submersible sewage pump.
6. Do not let the submersible sewage pump work for a long time
In order to avoid the long-term overloading of the submersible pump, do not pump water with high sand content and observe whether the current value is in the value specified on the nameplate at any time. If the current is found to be too large, it should be stopped for inspection. In addition, the dehydration time of the electric pump should not be too long, so as not to overheat the motor and burn it.
7. Pay attention to daily maintenance
Usually, the motor should be checked frequently. If the lower cover is found to be cracked, the rubber sealing ring is damaged or invalid, etc., it should be replaced or repaired in time to prevent water from infiltrating the submersible sewage pump.
Paying attention to the use of the submersible sewage pump protector and paying attention to some daily protection can better extend the service life of the submersible sewage pump.
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