Submersible pump maintenance and troubleshooting

First, the use of submersible pumps 1, the use of the inspection (1) Check the submersible pump casing for cracks, if there is a crack can not be used. (2) Check the submersible pump vent, drain hole, drain hole and the cable connector seal is loose, if loose must be tightened. (3) Check the submersible pump insulation resistance. Insulation resistance meter with 500V test, the insulation resistance of not less than 5MΩ, if less than this value, should open the water, vent, drying or drying before use. (4) submersible pump cable is best not to have joints, if joints should be bandaged, the entire cable should be intact, broken phenomenon, or should be replaced by a new cable. In addition, the cable should be overhead, not too long. (5) Before starting the positive and negative power supply to prevent reverse pump, no water. (6) before power on the power lines, switches for a comprehensive inspection, and power on the ground idling 3 ~ 5min, if the normal operation, and then put into use in water. 2, Matters needing attention in using (1) Different types of submersible pumps should be used according to the provisions of the lift, with steel pipe, rubber hose or pipe diameter should meet the technical requirements. (2) outlet pipe as far as possible not to bend, promptly find and repair the rupture of the water pipe to reduce power loss. (3) submersible pump into the water or raised water, you must pull the rope on the earrings, absolutely can not pull the cable, otherwise it will cause damage to the cable. (4) submersible pump can not pump sewage or sand with large amount of water, especially the use of mechanical seal submersible pump should pay more attention to this point. (5) Submersible pump power supply should be selected according to regulations, the distance between the power supply and the pump can not be too far, the voltage should be within ± 10% of the normal value, and a 1m or more iron rod shall be buried at the power supply or water pump as the ground, To ensure safety. Power must be grounded and reliable, install leakage protector. In addition, try to avoid the power supply voltage is too high or too low when the boot, the voltage is too high, will cause the motor overheating and burn the winding; voltage is too low, the motor speed drops, will cause the starter winding a long time fever, or even burn the winding and Capacitor. (6) Submersible pump diving depth is generally 0.5 ~ 3m, and should be lifted vertically, can not be lying, but can not fall into the sand. (7) submersible pump circuit breaker should be used as control equipment, but also can be used three knife switch, but must be fitted with 6A fuse. (8) submersible pump should not be too frequently "on", "stop", stop after the interval should be 3 ~ 5min restart, because the motor starts through the current is large, if frequent starts, the motor heat accumulation, temperature rise, Affect the winding insulation performance, will lead to winding burnout. (9) Submersible pumps should not be dehydrated. When pumping water in the pool, pay attention to the drop of the water level to prevent the power from exposing to the water. Test time on the ground for 3 ~ 5min, otherwise it will burn out the motor. (10) submersible pump should be in the work of special care, found abnormal, should immediately cut off and check. (11) submersible pump during use, do not wash things in the vicinity, swimming or livestock ran into the water to prevent electric shock accident. If found leakage phenomenon, should quickly cut off the power, check handling. (12) When the impeller rotates backward when the pump is running, stop immediately and replace any two wires in the three-phase core to make it work normally. Second, the submersible pump maintenance Submersible pump due to the pump and motor into the water to use, if the technical performance fails to meet the requirements, not only can not pumping, but also may cause accidents, it is necessary to pay attention to submersible pump maintenance and care. 1, always check the seal submersible pump internal water, it will cause the motor to burn out short circuit, so before each use, must be submersible pump seals of all kinds and found loose to tighten in time, if the seal is damaged, Should promptly replace the new pieces. Submersible pump 50h after each work, it should be put on the ground, the seals were inspected to ensure the safety of use. 2, regular replacement of lubricating oil immersion submersible pump work 500h, the seal room should be replaced by oil. After working for a year, should replace the motor cavity of the oil. And should pay attention to the brand of oil, submersible pump oil generally used for the 5th oil or 10 oil. Different brands of oil can not be mixed. Wet submersible pump continuous operation 2000h, the need to replace the oil, the replacement of lithium-based grease, can not use calcium-based grease. 3, regular use of rust submersible pump one year after the rust should be checked for rust, rust and paint a layer of rust-proof paint to be protected. 4, regular maintenance submersible pump every two years after use, should conduct a comprehensive inspection, all parts open, check, cleaning, lubrication, reassembly. 5, storage and maintenance Submersible pump long term without, do not dip in the water, it should be mentioned to the ground, dry water stains, hanging in a dry and ventilated room. Third, the submersible pump common troubleshooting and troubleshooting 1, the pump can not start Reason: the power supply voltage is too low; circuit somewhere open; pump impeller was foreign body stuck; cable break; cable pressure drop is too large, the cable plug is damaged; One phase of the phase cable is faulty; the windings of the motor room burn out. Remedy: Adjust the voltage to 342V ~ 418V; identify the cause of the power failure, and exclude; open the guide, remove debris; according to the cable specification table replacement; switch to thicker cables; replace the new plug, check the switch outlet and Cable; overhaul motor. 2, the pump does not start after the start of water, less water or intermittent water causes: the motor can not start; pipe blockage; pipeline rupture; drainage network blocked; suction port out of the water; motor reversal, pump seal ring, impeller damage; Head over submersible pump head rating too much; impeller reversed. Remedy: Eliminate circuit failure; remove clogs; repair welding or pipe change; remove clogs; re-install; swap power cord connection location; replacement of new parts; replacement of high-lift pump; re-install. 3, the motor can not start and accompanied by sound reasons: one phase open; bearing axis; impeller with foreign body and pump stuck. Remedy: repair the line; repair or replace the bearing; remove foreign matter. 4, the pump suddenly interrupted water supply, motor stall reasons: air switch jump or blow fuse, power brownout; stator winding burnout; impeller stuck; wet submersible pump motor water shortage; oil-filled wet submersible pump motor Missing oil. Remedy: Check the line fault, the motor winding fault, and excluded; check the cause of the power failure to eliminate the fault; repair stator windings; eliminate debris; repair motor. 5, the current is too large, the ammeter pointer swing reasons: the rotor sweep the hall; shaft and the relative rotation of the bearing is not flexible; due to severe thrust bearing wear, impeller and seal ring phase; shaft bending, bearing heart; water level down to the inlet The following; impeller submerged depth is not enough, inhalation of air caused by vibration; impeller compression nut loose. Remedy: Replace the bearing; Replace or repair the bearing; Replace the thrust bearing or thrust plate; Send factory repair; Adjust the throttle to reduce the flow or change the well; Pump down; Tighten the nut. 6, the unit is running violent vibration reasons: motor rotor imbalance; pump impeller imbalance; motor or pump shaft bending. Remedy: Send factory repair.

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