The application of soft start the motor?

Widely used in coking production process equipment such as fan, water pump, and belt conveyor,

generally need to directly under overloading starting motor, starting current is as high as 8 =;

Times, power supply network voltage drop is too large, to be the impact of the driven equipment and

control equipment failure rate is high.www.facebook.com/dongfeng.motor To solve

the problem of high power motor start-up, generally USES the frequency-sensitive rheostat, since the

lotus root transformer, B C % conversion and yanbian triangle startup mode, etc. But the traditional

way of step-down start widespread starting equipment complex, small starting current and starting

torque, etc. And the operation of the protection in motor, there are imperfect or insensitive. In

recent years, with the development of power electronics technology and its related devices, three-

phase asynchronous motor soft start technology has become increasingly perfect, and has been widely

used. Soft starter is composed of microprocessor and high power thyristor, with microprocessor

control thyristor conduction Angle, to control the output voltage. Therefore, the soft starter is

actually can automatically control the step-down starter. Because you can adjust the output voltage

and current closed-loop control, so be better than the series resistance and autotransformer such as

traditional step-down starting way. Drum cold section in our factory now chiller water circulating

pump motor as an example, the motor power < 95 DE, rated current 755 f, rated voltage 7 > 56, 755

(power lines, cable main section < 45 (4 pairs of power supply and the main transformer capacity <

555 d6f, motor overload starting. 1, the total pressure directly By the relevant calculations,

short-circuit capacity of power motor part system bus voltage drop in 437, the motor terminal voltage is the voltage of 89: left and right sides, directly below the motor starter needed; 6: the requirement of the terminal voltage, hard to conform to the requirements of the launch, it must adopt step-down start. 2, autotransformer step-down start Calculation result is: the < = > 3? ; 3 @ 7 a, B = * > 3? 29 the C7, B = > 3 D? "2" "C7E F = >" 351.

Using autotransformer buck up, there is the startup time is too long, start the difficulty and the

need to increase a step-down starting set of problems. And the failure rate is higher, the startup

current impact on motor is extremely adverse. 3, magnet generator  soft starter start Soft starter starts, not only the operation is simple, and can be obtained from the motor initial starting torque, starting voltage can be increased. Selects the kick start function, can provide big promotion for motor torque, in

order to overcome the inertia of load and quickly complete the boot process, the actual starting time

of 261. By drum machine cold section in the practical application showed that the circulating water

pump motor soft start technology not only can provide flexible start mode and excellent start

features, can also provide soft start, soft start of belt optional kick start, current-limiting

starting, double ramp up and started full pressure, etc. In addition, can provide various operations

of protection, fault conditions directly read operation parameters of the motor, fault self-diagnosis

function, with stepless regulating switch to eliminate the system of contact. Humanized menu

interface can easily access or modify the parameters, to achieve centralized control through

additional communication network interface. Also can effectively reduce the startup of mechanical

stress, reduce the impact to mechanical transmission components.