SPRQ 333软启动器应用
　　SPRQ 333 soft starter is widely used in industrial and agricultural production field.。
　　◇Pump: with the function of pump control, when starting and stopping, the water hammer due to the liquid impact can be reduced and the cost of system maintenance is saved.。
　　◇Ball mill: Wear and tear of the gear torque and the start-up shock to the electricity grid can be reduced。
　　◇Compressor: the smooth start can be realized, the current shock is reduced and the service life is extended by the way of current limiting and dual-slope start.。
　　◇Breakers: electric motor being overheated then burned can be prevented due to mechanical failure or obstruction through the rocked rotor and quick protection.。
　　◇Transportation machine: smooth running can be realized by soft start and the displacement of products and liquid overflow can be avoided.
　　◇Plastic extruder: Big static friction load is added. A low-speed meshing process will be undergone in the start-up of the motor, and it should be controlled by soft stop in time of shutdown.。
　　◇Auto-filling production line: the time extension of shutdown is required in the condition of such load. In this way the load shifting and overflowing can be reduced in the process of shutdown.。
　　◇ Dyeing machine: the products such machines as dyeing machine and the similar papermaking machine, film machine, printing machine and spinning machine produced are relatively thin and the splitting and breaking must be avoided. After the application of soft starter, the cotton yarn is prevented from splitting because of excessive pulling strength. When this type of equipment using the soft starter, the ramp is not big and the time is not long.
　　◇Rolling machine (wheel pressure and calendar stretcher roll), textile and paper calendar, leveler and spiral transportation equipment:：
Such type of machinery as rolling machine starts to accelerate at the beginning of start-up. Because of the rolled materials with a movement of the relative direction (i.e. the friction), there must be the inertia compensation to protect the tension of materials. By the same token, in the process from constant speed to stopping (soft stop), the inertia compensation should be given by reducing the torque to maintain tension when slowing down.
　　Features of SPRQ 333 soft starter
　　All-digital automatic control of 16-bit single chip is adopted.。
　　The current, voltage and time of the start torque can be flexibly set up according to different load to obtain the best current impact and the best torque controlling features. The smooth and gradual start is provided for motors, the shock of the start current to the grid is reduced, the vibration and noise of equipment is reduced, the service life of the mechanical driving system is extended and the work environment of workers is improved.
　　Start current can be adjusted according to load to reduce the wear and tear of start-up. The best torque is produced with the minimum current.。
　　The unique feature of the soft shutdown is that the life span of the electrical contact is greatly extended and the machinery needs on different occasions can be meet。
　　With a variety of protection of over-current, overload and power shortage, the equipment and eletromechanical safety is guaranteed。
　　The output voltage of soft starter is raised according to the set discipline. After the completion of the startup process, along the superior acceleration curve, the controlled motor torque is withdrawn from the thyristor components and the bypass contactor continues.。
　　Several features of the convenient external control interface: digital delayed-start control, input of soft start control, output of the start delayed relay and output of fault relay.
　　Phase sequence can be automatically identified with the protection function of phase sequence。
　　Free stop and soft stop, the time of soft stop can be adjusted.
　　The function of all-digital setting and external control greatly facilitate users. 。
　　Built-in standard F~$232C／RS485 interface.
　　The product is new and unique in structure, small in size, reliable in performance and convenient in installation, operation and use.