The CGR5100 series AC motor soft starter is a new type of motor starting device with excellent performance. This product effectively limits the starting current of asynchronous motors and can be widely used in loads such as fans, water pumps, conveyors, and compressors. It is an ideal replacement for traditional starting devices like star/delta conversion, autotransformer reduction, and magnetic control reduction.

　　1. Function

　　Reduce the starting current of the motor, decrease distribution capacity, and avoid capacity expansion investment; reduce starting stress and extend the service life of the motor and related components.

　　Multiple starting modes and a wide range of current, voltage, and time settings can adapt to various load conditions for motor start and stop operations.

　　2. Specification Nameplate

　　3. Characteristics

　　Applicable to various loads with a rich variety of starting modes.

　　Convenient parameter settings allow the motor to achieve optimal starting effects under different load starting modes.

　　High technical performance

　　By using high-performance microprocessors and powerful software support functions, the control circuit is fully simplified and optimized, allowing for consistent and accurate operational performance without the need to adjust circuit parameters.

　　High reliability

　　All electrical components have undergone strict selection, and the control part of the entire machine has passed high-temperature cycling tests and vibration tests, ensuring high reliability of the products leaving the factory.

　　Optimized structure

　　The unique modular structure and top-entry bottom-exit wiring method introduce anti-interference technology, rationally layout the control board, and use an IC bus for the keyboard, making it compact and easy to integrate into complete systems.

　　User-friendly human-machine interface

　　The keyboard displays rich content, is intuitive and convenient to operate, and allows for setting and modifying parameters such as starting, stopping, running, and protection according to different loads, with real-time display of various working states, and easy querying of phase working currents, machine temperature, and power frequency.

　　Comprehensive motor protection functions

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

　　4. Working principle

　　The CGR5100 series motor soft starter uses three pairs of anti-parallel thyristors connected in series with the stator circuit of the AC motor. Utilizing the electronic switching action of the thyristors, the microprocessor controls the change in their triggering angle to alter the conduction level of the thyristors, thereby changing the input voltage of the motor to achieve soft starting control. Once the starting is complete, the output of the soft starter reaches the rated voltage, at which point a bypass control output signal activates the three-phase bypass contactor KM, connecting the motor to the power grid.

　　When the bypass contactor is engaged, the motor enters bypass operation mode, and the soft starter automatically shuts off the triggering pulse of 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, achieving a soft stop. The working principle is illustrated in the following diagram.

　　5. Specifications and dimensions