ABB Soft Starter in beater Application

Abstract: By the time of motor starting current and torque performance analysis, the choice of an all-digital AC motor soft start as a three-phase asynchronous motor equipment, and equipment in the pulp and paper Applications to address high-power motor starting high-current problem, to ensure the normal operation of the safety device, to energy-saving effect of reducing consumption, saving maintenance costs.

Keywords:: motor start, soft starter, pulping equipment
Abstract: Through the analysis of motor starting current and torque performance, an all-digital AC motor soft start-er was selected as three phase asynchronous motor starting equipment, and applied in pulping equipment to solve the problem of large starting current for high-power motor in order to ensure the safe and reliable operation of equipment to achieve the consumption reduction and power conserva-tion and save the cost of maintenance.

Keywords:: motor start-up; soft starter; pulping equipment

Directly start the motor starting current up to rated current of 5 to 7 times, long-term impact of a large number of high-current control will affect the service life of electrical equipment, increase maintenance costs, and even affect the normal operation of other electrical equipment, and secondly, starting switch Moment of up to 2 times the normal torque, an impact on the load and increase transmission wear and tear of mechanical components, additional maintenance costs, Moreover, if the starting configuration of traditional equipment, high cost, bulky equipment, complicated structure and load match The motor torque is difficult to control. ABB fully digital soft starter for AC motors, three-phase asynchronous motor starting equipment, in accordance with pre-set control mode of the motor, in particular some high-power three-phase asynchronous motor for smooth down press Start.

1, the start of the original three-phase asynchronous motor motor starting characteristics of the way: the control circuit is simple, fixed starting torque, starting inefficiency, failure frequently, and there is the secondary impact of the starting current problems affecting the voltage and transfer related equipment moment. And A BB has a good starter starting performance, various parameters were adjusted, it is composed by the advanced thyristor devices, small size, low power consumption, high degree of automation, reliability, security, maintenance-free. in use, according to the requirements of regulator starter, the starting current to control it, so smooth and no impact on the whole startup process. it work is the use of thyristor phase control principle, control the firing angle of thyristors to control the output point voltage magnitude to control the load to meet the starting requirements. the starting process, the soft starter starting curve is increased in accordance with pre-motor terminal voltage, the motor can smoothly accelerate the completion of its startup process.

2 Application of the soft starter and adjustment of 2.1, reasonable regulation control parameters A BB and other electronic soft starter soft starter works basically the same. It is by controlling the acceleration of the motor starting torque and the extension of time to reduce the starting current, to reduce the high current load on the impact of the motor, so that the electrical equipment to a smooth start. Therefore, the soft starter in the Application when the site should be aware of the characteristics of the load and precisely adjust the various parameters.

2.2 The reference voltage adjustment to optimize the starting current reference voltage is the basic condition of equipment can start. For the reference voltage is required to adjust the motor rotation immediately after the applied voltage, the load device to work. If the motor does not rotate after joining the voltage should increase the reference voltage setting value, when the motor starts too fast, you should reduce the reference voltage setting value. in adjusting the reference voltage should be repeated several times until the voltage is applied, the motor load equipment immediately start up. on disc refiner 185kW three-phase asynchronous motor soft starter with ABB debugging process, the reference voltage regulation at rated voltage 75%, the starting current 278A, the motor is quickly started. reference voltage adjusted to 40% of rated voltage, the motor Start slow start, starting current rose evenly from the 140A 370A, the motor started and then dropped in the current work 290A running around. fully meet the requirements of the soft starter.

2.3 The starting time adjustments to improve the output characteristics of the motor torque and the starting time of the acceleration has a direct relationship, A BB soft starter can start the motor at a set time (0.5 ~ 600s to the full voltage from the initial voltage ramp starting . for different load connection can be adjusted starting time of the soft starter to control the motor starting characteristics. in the adjustment depending on the load connected to the specific circumstances to determine. reposted elsewhere in the Research Papers Download http://www.hi138. com
This adjustment by repeating several times to join in the different load cases, through the adjustment of the soft starter to control acceleration time to achieve uniform to ensure the safe operation of equipment. In normal conditions, the 185kW disc refiner The soft-start time adjustment in the 20 ~ 30s, starting characteristics of good and avoid the motor in the starting line on the impact of supply and meet the normal requirements of the production process.

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