【 Weak current College 】 submersible pump of use and notices---Power By 【 China power house network 】

① selection for use shall, in accordance with their own operating characteristics, proper selection of submersible pumps, the main consideration when selection flow, lift installation, etc. Only the selected lift and actual head close to the water pump to run efficient energy-saving, choose improper will influence the running pump runs great, low pump flow rate is not to or water leakage, high diving pump work upwards, causing excessive mechanical friction, damage the pump dive pump with a flow too much cause motor overload, if long-running, winding temperature, insulation layer gradually aging, even from burnt motor.
② After putting into operation and repair of hoisting and considerations before the lifting cable protection to prevent damage, do not lift the power directly, the feathers with lifting device (such as tripod, crane hoist or electric hoist) capacity should be greater than submersible pump weight, and leave enough room. Rotating crane under artificial before checking whether the flexible impeller rotation, and the main contactor contacts are good, curl cord and cable fittings have no break, bruises, motor shell grounding is reliable (to ensure the safety, earthing should generally be the other lines grow 5mm), with the multimeter check phase line conduction. Conditional available digital DC low resistance Tester (measurement accuracy of up to l0U2) three-phase winding resistance individually check balance measurement generally regarded submersible pump power size select appropriate measure, to 100kW above-sized WQ submersible sewage pump, its white supremacy of resistance is generally scores 100 mohm, you can select the measuring time Note 0.2Q must each be red and Black 2 root detection table pen 2 root pointer while contact is unsupervised (conductor), in order to reduce errors and disturbances, as in Figure 4-43. Note: even if the motor phases or in partial turn to turn short-circuit, multimeter for their own accuracy and contact resistance, not on three-phase winding resistance balance make accurate measurement, it is recommended to dozens or hundreds of kW motor adopts digital DC low resistance tester. If you use multimeter measure measurement display values still winding and two table pen shorted the values displayed when, depending on the multimeter model, numerical generally 0.5 ~ 10.
Installation does not allow the submersible pumps horizontal position or place it in the population, according to the sewage situation determine well submersible pump. The minimum height from the bottom to avoid being sand buried or pump population was suspended matter clogging, resulting in lower heat transfer speed, motor winding temperature rise, stator insulation ageing, shorten the service life or cause without tripping. The pump must not be placed directly in the mud or floating sediment, as do need temporary installation, it is recommended that the pump is placed in the larger floor or a solid ground to avoid vibrations resulting subsidence. After installation, wait until automatic stirring JPWQ JYWQ, well submersible sewage pumps completely immersed in the water, on people power before 500V megohmmeter check motor three relatively insulation resistance, minimum 1MQ.
③ runtime considerations start submersible electric pumps, should rotate smoothly, no abnormal noise, vibration and observe the motor current and voltage with no obvious before and after launch. Motor power up, the main loop if the motor is turning, should be immediately shut down to prevent the motor card dead long power and burned. Note to first-time installation or repair of the pump dive pump after putting into operation, on the machine may only start in place in order to observe the submersible pump exception, should be immediately shut down, check direction of rotation is correct, if properly installed, look for the causes of troubleshooting before commissioning. Due to the motor burned resulting in the winding rewindable submersible pump, 1st commissioning several hours later, you can stop measuring thermal insulation resistance, should be not less than 0.38MQ can continue to use.
Submersible pump run time must be dived into the water and start stop should not be too frequently; hourly boots are generally not more than 6 times (specific frequency and power and submersible pump type related) spaced, and requirements. Again should stop after 3 ~ 5min to prevent damage to the pipeline within the submersible pumps water hammer.
④ power, environmental and other considerations for submersible pump to the power supply voltage and frequency deviation range have certain requirements, power instability regions should take to prevent damage. Pump submersible pump of high power must buck starts or soft start, to reduce the power grid near the low-voltage electrical equipment, instruments, automatic control system and the impact of submerged pump itself. Submersible pumps for the transportation of liquids in General in solids content and solid particle diameter, pH, water temperature, chloride ion content all have certain requirements, use required attention, so as not to cause unnecessary damage. Runtime should make diving pump safety dive, and the cooling water cooling conditions in order to facilitate the submersible pumps for cooling.
Submersible pump control input level meter and the float installation location must be appropriate to avoid a too low sediments, causing the water level gauge cannot detect or accuracy, taking in the float down the minimum level of guarantee submersible pump has dived into the water, the usual attention to timely clean bottom mud and debris.
Submersible pumps deactivates if prolonged, they should be hanging up, cleaning exhaust port, water cooling sleeve of all emissions clean and clean sediment (cold winter is particularly important to antifreeze bad motor), will be scrubbed clean inside and outside of motor pumps, fully painted anti-rust treatment, conditions can pump important parts painted butter, bearing and lubrication oil to prevent corrosion of parts, at the conclusion of stored in non-corrosive substances and dry and ventilated warehouse. If placed in the water, at least every few days, time running l time not less than 30min.