Abstract This article focuses on the use of easy-drive CV3300 series 280KW inverter, drag 280KW6 pole asynchronous motor.
Keywords: slurry pump frequency converter
I. Introduction
Slag pump is a centrifugal pump in terms of working principle. Conceptually speaking, it refers to a machine that increases the energy of solid-liquid mixed medium through the action of centrifugal force, and converts electrical energy into kinetic energy and potential energy of the medium. It is mainly applied to mines, power plants, building materials and petroleum industries. This article describes the use of Easy Drive CV3300 series inverters in slurry pumps. A CV3300-4T2800G machine is used to drive a 280KW6 pole three-phase asynchronous motor. Use the inverter's panel potentiometer to adjust to meet different speed requirements.
Second, the slurry pump situation
The basic structure is composed of impeller, pump casing, pump shaft, bearing and bracket, and the power also includes electric motor, pair of wheel or belt wheel coupling, etc. The wear parts also include liner bushing, etc. The seal includes shaft seal, The auxiliary impeller and the like, support members include brackets, etc., but the internal principle is the same. When the impeller rotates rapidly, the blades cause the medium to rotate quickly. The rotating medium flies out of the impeller under the action of centrifugal force, and the medium in the pump is After throwing out, the center part of the impeller forms a vacuum zone, and the media is pressed into the feed pipe through the pipe network under the action of atmospheric pressure (or water pressure). With this endless cycle, continuous feed can be achieved to achieve head and flow requirements for process design. Of course, the feed method is currently more press-in type, ie the material level is higher than the feed tube, then the step of watering the interior from the upper water pipe or the pump casing can be subtracted.
Third, easy to drive CV3300 frequency changer characteristic
1) High precision up to plus or minus 0.5%, fast torque response <20ms;
2) Large low-frequency torque, under open-loop vector mode, can achieve 0.5HZ with load 150% of the running;
3) Heavy load overload capacity, 150% rated load 1min, 180% rated load 3S;
4) Wave-by-wave current limiting function can limit the motor current to a certain level without affecting the output torque;
5) Wide operating voltage range, rated voltage 380~440V;
6) Independent wind tunnels, plus a protective net design to prevent yarn jams and strong environmental adaptability;
7) Over-current, over-voltage, short circuit, phase loss, under-voltage and other comprehensive protection can effectively protect the motor.
Fourth, the scene of application
V. Summary
Easy to drive CV3300 series inverter, speed range, high speed accuracy, high operating efficiency, mechanical properties, hard, static stability, start, brake energy consumption is small, non-polar speed. Therefore, the use of frequency converter for AC three-phase asynchronous motor for speed control has been widely used.
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