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The key to rolling solid-state soft start is suitable for medium-voltage AC motors of the following 10kV, using excellent DSP control systems and power electronics technology. The rolling soft starter is made up of several thyristor series connected in parallel. It can consider different current amount and working voltage regulations. The operating angle of the output voltage can be manipulated by manipulating the opening angle of the thyristor. The rolling AC motor soft starter has the advantages of light weight, low power, sales price, high sensitivity, no contact, maintenance-free, no air pollution, and convenient installation. Compared with other traditional starting methods, its unique intelligent control system method can easily and accurately set the main parameters such as starting torque, starting current, starting time and shutdown time, and can also be used with miniature Machines, PLCs, etc. carry out network control. This new project uses RNMV2000 series products to press the solid state hard disk soft starter.
The principle of rolling solid-state soft start cabinet The key to the operation of RNMV2000 series products is the microcontroller CPUO, the microcontroller automatic control system can carry out the motor
Startup and maintenance. The CPU performs phase angle opening operation on the SCR to reduce the working voltage applied to the motor, so that the working voltage and current on the motor smoothly increase the torque of the motor until the motor accelerates to a fast operating condition, thereby reducing the starting time of the motor. Impact of the power grid, the motor itself, the electrical equipment and mechanical equipment of the connected equipment. When the motor exceeds all normal speed ratios, the dual-loop power supply AC contactor is connected. After the motor has started, the soft starter is again monitored by the motor and a variety of common fault maintenance is presented. The basic principle of its operation is shown in Figure 2. The RNMV2000 series products show three startup methods:
(1) Operating voltage steep slope start mode The original torque is set to the value when the motor can just push the load to rotate. Then the working voltage slowly rises smoothly, and the motor is within the limited steep slope time and the motor starting current range. Smoothly running faster than speed. The motor of this new project is set to have a working voltage steep slope
(2) System start mode
At start-up, the amount of current is quickly increased to the specified value, always running to the motor.
(3) Light load start mode
This type of starting method is mainly used for motors to drive large inertial force loads such as wet ball mills, etc., to increase the conversion time of 8 s to ensure that it is not easy to generate excessive current impact due to too early conversion.