Precautions for use and maintenance of submersible pumps

Update: 10-02-2020

1. When installing the submersible pump, the cable shou […]

1. When installing the submersible pump, the cable should be overhead and the power cord should not be too long. When the unit is launched, do not subject the cables to force, otherwise the power cord may be broken. Do not sink the submersible pump in the mud, otherwise it will cause poor heat dissipation of the motor and burn the motor windings.
Second, pay attention to its model, flow and head when purchasing submersible pumps. If the selected specifications are not appropriate, sufficient water output will not be obtained and the efficiency of the unit will not be exerted. In addition, the direction of rotation of the motor should also be clarified. Some types of submersible pumps can produce water during forward and reverse rotation, but the amount of water is small and the current is large during reverse rotation. The reverse rotation will damage the motor windings. In order to prevent electric shock caused by electric leakage when the submersible pump works underwater, a leakage protection switch should be installed.
Third, usually check the motor. If it is found that the lower cover is cracked, the rubber seal ring is damaged or invalid, etc., it should be replaced or repaired in time to prevent water from penetrating into the machine.
Fourth, try to avoid starting at low voltage. The power supply voltage and the rated voltage must not differ by 10%. If the voltage is too high, the motor will overheat and burn the windings. If the voltage is too low, the motor speed will drop. If it does not reach 70% of the rated speed, the start-up centrifugal switch will be closed, causing the start-up winding to be long. Time to energize and heat up and even burn out windings and capacitors. Do not switch the motor frequently. This is because the electric pump will return when it stops. If it is turned on immediately, the motor load will start, which will cause the starting current to be too large and burn the winding.
Fifth, do not allow the submersible pump to run for a long time without overload. Do not pump water with a large amount of sand. The dehydration operation time of the electric pump should not be too long. During the operation of the unit, the operator must observe at any time whether its working voltage and current are within the values ​​specified on the nameplate. If it does not comply, the motor should be stopped to find out the cause and eliminate the fault.