1, which conforms to the secondary torque reduction curve of fan load characteristics.

2. The operation curve can be set according to the load.

3. Speed regulating and energy saving Tri-crystal S350 series is a new generation of high-performance vector frequency converter, which has the following characteristics:

■ The latest high-speed motor control chip DSP is adopted to ensure the fast response of vector control.

The modular design of hardware circuit ensures the stable and efficient operation of the circuit.

■ The design combines the European automobile design concept, with smooth lines and beautiful appearance.

■ The structure adopts independent air duct design, and the fan can be disassembled freely, with good heat dissipation.

■ PG vector control, PG vector control, torque control and V/F control cannot be selected.

■ Powerful input and output multifunctional programmable terminal, speed regulating pulse input and two analog outputs.

■ Unique "excavator" adaptive control function, which automatically limits the upper limit of motor torque during operation, effectively restraining frequent overcurrent trips.

■ Wide voltage input, automatic voltage stabilization (AVR) of output voltage, instant power failure without stopping, and stronger adaptability.

Built-in advanced PID algorithm, fast response, strong adaptability and simple debugging; 16 speed control, simple PLC to achieve multi-functional logic control such as timing, constant speed, orientation, and a variety of flexible control methods to meet the requirements of various complex working conditions.

■ Built-in international standard MODBUS RTU ASCII communication protocol, users can control the communication network of frequency converter 485 centrally through PC/PLC control host.