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Centrifuges in the frequency converter application analysis |
| Author： Date：2009-01-27 |
1.Mechanical separation is a mixture of liquid and solid particles to separate the equipment can be broadly divided into centrifuges, separators, filter, oil filter, filter, and other equipment. Mechanical separation is the general process of post-processing equipment, so a direct bearing on the quality of the final product. Overall, the separation of China's machinery and the level of foreign advanced technology level there is a big gap. Of the main problems: the separation of mechanical products, fewer specifications, can not fully meet the needs of domestic product, in particular the separation of viscosity materials, fine mechanical precision, high efficiency, large capacity, high degree of automation of the mechanical separation of the vast majority of import-dependent; Separation technology research and application of the mechanism behind the slow pace of new product development; behind the manufacturing process, low production efficiency, product reliability, stability, good technical level and low level of automation; equipment and materials can not meet the separation of machinery products Needs, in particular, product quality, reliability is very unstable.
From the mechanical separation of development, the exchange of digital converter will replace the original electromagnetic speed, DC drive, hydraulic coupling speed, multi-speed motor, and gradually became separated from the main mechanical drive. This article is the introduction of ABB's new ACS550 frequency converter in the separation of the mechanical design and application.
ACS550 is ABB's new intelligent inverter, the inverter series for 0.75KW ~ 355KW low-voltage AC drive. It can accurately control the speed and torque to match the existing standard squirrel cage induction motor. ACS550 have three ways to control, that is, the scalar V / F control, sensorless vector control, torque control, so it is not only able to converter suitable for the simplest operation of the motor, but also can be applied to the complexity of the workplace. Guozainengli its reliable design, at the same time can also meet the general and the heavy work load.
Separation of motor-driven machinery in general is divided into single-and multi-motor drive motor drive two, this article will focus converter ACS550 introduced as a single-motor drive in a typical case of three-foot centrifuge and the application of multi-motor drive to achieve a typical case of lying Lo centrifuge applications.
2.inverter in the three-foot centrifuge application
Three-foot centrifuge is a simple structure, strong adaptability of materials, application of the most extensive vertical centrifuge. Sedimentation and filtration sub-type two broad categories. Filtering is the most widely used three-foot-centrifuge. That is, it can be isolated for only a few microns in diameter fine, but also for into items from the liquid. By adjusting the duration of the operation process, the filter can be used to ease the separation of the different kinds of suspension, by adjusting the filter cake washing, scrubbing to meet different requirements. Such models are mainly applicable to small and medium-scale production, but there are a lot of these strengths, it is widely used in pharmaceutical, chemical, light industry, textile, food, machinery manufacturing industries.
In this application, the inverter is driven centrifuge drum, a smooth start, the separation factor adjustable; completely overcome the traditional brushless DC centrifuge-noise, high failure rate, short life, speed instability, such as shortcomings It is gravity separation equipment replacement product. AC variable frequency vibration in the centrifuge and conversion of several important indicators, such as motor with distinct characteristics and originality. Common three-foot stand-alone centrifuges in the power-driven 3KW between 55KW and, ACS550 can do.
ACS550 in the three-foot centrifuge application of the principle of ACS550 frequency converter principle, in its external circuit, is divided into three main parts:
(1) DC bus UDC +, UDC-termination single brake +? Side, and then under the different options (such as three-phase power grid back then braking, braking energy is then braking resistance), Tk for brake unit The internal relay, when the unit fails, Tk moves through the converter terminal DI4 definition of the moment blockade U / V / W output.
(2) control loop input and output terminals, the use of macro definition 9902 = 5
DI1: manual / automatic start / stop (manual): a start-up power
DI2: being transferred / reverse (manual): a power shift to reverse
DI3: EXT1/EXT2 choice: a choice Autocontrol power
DI4: allowed to run: Once the converter will stop off |