The CGR2000 series digital soft starter for AC motors is a new type of motor starting device with excellent performance.

The CGR2000 series digital soft starter for AC motors is a new type of motor starting device with excellent performance. This product can effectively limit the starting current of asynchronous motors during startup and can be widely used in loads such as fans, water pumps, conveyors, and compressors. It is an ideal replacement for traditional starting devices such as star/delta conversion, autotransformer reduction, and magnetic control reduction.

　　Features

　　1. Applicable to various load starting methods: Provides a variety of starting methods, allowing convenient settings of appropriate control parameters to achieve optimal starting effects for motors under different loads.

　　2. High technical performance: The use of high-performance microprocessors and powerful software support functions allows for significant simplification and optimization of the control circuit, achieving consistent and accurate operational performance without the need for circuit parameter adjustments.

　　3. High reliability: All electrical components have undergone strict selection, and the main control board has passed high-temperature cycling tests and vibration tests, ensuring high reliability of the products leaving the factory.

　　4. Optimized structure: The unique modular structure and top-in, bottom-out wiring method introduce anti-interference technology, rationally layout the control board, use I2C bus for the keyboard, resulting in a compact size that is convenient for integration and assembly.

　　5. User-friendly human-machine interface: The keyboard displays rich content, with intuitive and convenient operation. Parameters for starting, stopping, running, and protection can be set and modified according to different loads, with real-time display of various working states, allowing easy querying of phase working currents, machine temperature, and power frequency.

　　6. Comprehensive motor protection functions: With online operating capability, it can monitor working voltage, current, and temperature in real-time, providing comprehensive motor protection while maintaining appropriate protection thresholds to ensure stable operation of the motor.

　　7. Resettable rated output current: When the rated power of the soft starter is greater than the actual load power, the actual output current of the soft starter can be modified within a certain range to match the actual load size, ensuring the accuracy of the soft starter's starting effect and protection functions for the motor.

　　8. Excellent soft stop performance: Once you set the soft stop working mode, it provides soft stop effects whether during startup or in operation. For different types of loads, smooth stopping effects can be achieved through reasonable parameter settings, especially suitable for assembly line filling production lines and water pump loads.

　　Working Principle

　　The CGR2000 series motor soft starter uses three pairs of anti-parallel thyristors connected in series in the stator circuit of the AC motor. By utilizing the electronic switching action of the thyristors, the microprocessor controls the variation of their triggering angle to change the conduction level of the thyristors, thereby altering the input voltage to the motor to achieve soft starting control. Once the startup is complete and the output of the soft starter reaches the rated voltage, a bypass control output signal will activate the three-phase bypass contactor KM, connecting the motor to the power grid.

　　After the bypass contactor is engaged, the motor enters bypass operation mode, and the soft starter automatically shuts off the triggering pulse to the thyristors. If you have set the soft stop function, during stopping, the soft starter will first turn on the thyristors, then disconnect the bypass contactor, and gradually reduce the conduction angle of the thyristors, allowing the motor to slow down smoothly to achieve the soft stop effect, as shown in the diagram below.

　　Note: The bypass contactor (KM) for the CGR2000A series soft starter is built-in.

　　Installation method and dimensions