[Power supply voltage is abnormally turned on]
In rural areas, because the low-voltage power supply line is relatively long, the terminal voltage at the end of the line is 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 Solar seawater pump drops. When the rated speed is less than 70%, the centrifugal switch will be closed, causing the starting winding to be energized for a long time and even burned out. Windings and capacitors. Conversely, a voltage that is too high causes the motor to overheat and burn out the winding. Therefore, in the operation of the Solar seawater pump, the operator must observe the power supply voltage value at any time. If it is lower than the rated voltage by 10% or less and higher than the rated voltage by more than 10%, the motor should be stopped, the cause should be found and the fault should be eliminated.
[Installation of leakage protector]
The leakage protector is also called a life-saving device, and its function can be understood from the words "life-saving device". Because the Solar seawater pump works underwater, it is easy to leak electricity and cause electric energy loss and even electric shock. If the leakage protector is installed, as long as the leakage value of the Solar seawater pump exceeds the operating current value of the leakage protector (generally not exceeding 30 mA), the leakage protector will cut off the power supply of the Solar seawater pump to avoid leakage of electricity and waste power to ensure safety.
[Avoid frequent switching]
Do not switch the Solar seawater pump frequently. This is because the recirculation occurs when the electric pump is stopped. If it is turned on immediately, the motor load will start, causing the starting current to be too high and the winding to be burned out. Due to the large current at start-up, frequent start-up will also burn the Solar seawater pump motor windings.
[Do not let the Solar seawater pump work for a long time]
In order to avoid long-term overload operation of the Solar seawater pump, do not pump water with a large amount of sand and observe whether the current value is on the nameplate. If it is found that the current is too large, stop the inspection. 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.
[The direction of rotation of the motor is correct]
The direction of rotation of the motor should be clarified. There are many types of Solar seawater pumps that can discharge water during forward and reverse rotation. However, when reversing, the water output is small and the current is large. If the reversal time is long, the motor winding will be damaged.
[Cable line installation and insulation resistance requirements of Solar seawater pumps]
When installing the Solar seawater pump, the cable should be overhead and the power cord should not be too long. Do not force the cable when the Solar seawater pump is launched or raised, so as not to cause the power cord to break. Do not sink into the mud when the Solar seawater pump is working, otherwise it will cause poor heat dissipation of the motor and burn the motor windings. When installed, the insulation resistance of the motor should not be less than 0.5 megohms.
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