First, the use of the valve test bench 1, the use of the inspection (1) Check the valve test bench shell if there are cracks, if there is a crack can not be used. (2) Check the valve test bench bleed hole, drain hole, drain hole and cable connector seal is loose, if loose must be tightened. (3) Check the insulation resistance of the valve test bench. 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) Valve test bench cable is best not to have joints, if joints should be bandaged, the cable should be intact, broken phenomenon, or should be replaced with 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, the use should pay attention to the matter (1) different types of valve test bench, should be used in accordance with the provisions of 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) The valve test bench 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) valve test bench can not pump sewage or sand with large amount of water, especially the mechanical seal valve test bench should pay more attention to this point. (5) Valve test bench 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 buried in the power supply or pump 1m above the iron bars for 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) The diving depth of the valve test bench is generally 0.5 ~ 3m, and should be lifted vertically, can not lie down, but can not fall into the sediment. (7) valve test bench circuit breaker should be used as control equipment, you can also use three knife switch, but must be fitted with 6A fuse. (8) valve test bench should not be too frequently "on", "stop", stop after the interval should be 3 ~ 5min restart, because the motor starts through a large current, if the frequent start, the motor heat accumulation, temperature rise , Affect the winding insulation performance, will lead to winding burnout. (9) valve test bench 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) valve test bench should be in the work of special care, found abnormal, should immediately cut off and check. (11) The valve test bench 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 valve test bench maintenance Valve test bench because of 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 must be noted that the valve test bench maintenance and care. 1, always check the seal valve test bench internal water, it will cause the motor short circuit burn, so before each use, must be on the valve test bench seals were found and found to be loose tighten in time, if the seal Damaged, new parts should be promptly replaced. Valve test bench after each work 50h, it should be raised to the ground, the seals were inspected to ensure the safety of use. 2, regular replacement of lubricating oil immersion valve test bench work 500h, the seal room should be replaced oil. After working for a year, should replace the motor cavity of the oil. And should pay attention to the brand of oil, valve test bench used oil generally No. 5 oil or No. 10 oil. Different brands of oil can not be mixed. Wet valve test bench continuous operation 2000h, the need to replace the oil, the replacement of lithium-based grease, can not use calcium-based grease. 3, regular rust valve test bench after one year, should check its corrosion, remove rust, and coated with a layer of anti-rust paint, to be protected. 4, regular maintenance valve test bench every two years after use, should conduct a comprehensive inspection, all parts open, check, cleaning, lubrication, reassembly. 5, storage and maintenance Valve test bench long time 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 common test valve failure and troubleshooting 1, the pump can not start Reason: the power supply voltage is too low; circuit somewhere open; pump impeller was stuck foreign objects; cable break; cable pressure drop is too large, the cable plug is damaged; One phase of the three-phase cable is not connected; the motor room windings burn out. Remedy: Adjust the voltage to 342V ~ 418V; identify the cause of the power failure, and the cable; overhaul the motor. 2, after the pump starts without water, less water or intermittent water causes: the motor can not start; pipe to exclude; open guide, remove debris; according to the cable specification table replacement; switch to thicker cables; Switch outlet blocked; pipeline rupture; blocked the water screen; suction port exposed water; motor reversal, pump seal ring, impeller damage; head over the valve test bench lift too much value; 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, pump out of water suddenly interrupted, the motor stall reasons: air switch jump or fuse blown, power brownout; stator winding burnout; impeller stuck; wet valve test bench motor water shortage; oil-filled wet valve test bench Motor lack of 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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