Malfunctions and maintenance of submersible pumps

Malfunctions and maintenance of submersible pumps
Maintenance and troubleshooting of submersible pumps
1、 Use of submersible pumps
1. Inspection before use
(1) Check the casing of the submersible pump for cracks. If there are cracks, they cannot be used.
(2) Check if the seals at the drain holes, water holes, oil holes, and cable joints of the submersible pump are loose. If they are loose, they must be tightened.
(3) Check the insulation resistance of the submersible pump. Using a 500V insulation resistance meter for testing, the insulation resistance should not be less than 5M Ω. If it is lower than this value, the drain hole should be opened, dried or sun dried before use.
(4) It is best not to have any joints in the cable of the submersible pump. If there are any joints, they should be wrapped properly and the entire cable should be free from damage or breakage. Otherwise, the cable should be replaced with a new one. Additionally, the cable should be overhead and not too long.
(5) Before starting, correct the positive and negative poles of the power supply to prevent the water pump from reversing and not producing water.
(6) Before starting the machine, conduct a comprehensive inspection of the power supply circuit and switches, and idle on the ground for 3-5 minutes. If the operation is normal, put it into water and put it into use.
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2. Precautions during use
(1) Different models of submersible pumps should be used according to the specified head, and the inner diameter of the steel pipe, rubber pipe, or sail pipe used should meet the technical requirements.
(2) Try not to bend the water outlet pipe as much as possible, and promptly detect and repair the rupture of the water delivery pipe to reduce power loss.
(3) When putting a submersible pump into or out of the water, it is necessary to pull the rope on the earring and never pull the cable, otherwise it may cause damage to the cable.
(4) Submersible pumps cannot discharge sewage or water with high sand content, especially those with mechanical seals.
(5) The power supply for submersible pumps should be selected according to regulations, and the distance between the power supply and the water pump should not be too far. The voltage should be within ± 10% of the normal value, and a 1m or more iron rod should be buried at the power supply or water pump as a ground wire to ensure safety. The power supply must be grounded reliably and equipped with a leakage protector. In addition, try to avoid starting the machine when the power supply voltage is too high or too low. If the voltage is too high, it will cause the motor to overheat and burn the winding; If the voltage is too low, the motor speed will decrease, which will cause the starting winding to heat up for a long time, and even burn out the winding and capacitor.