Description
AI and AO's explanation (1) AI signal: analog input The so-called analog quantity is 4-20mA or 0-10V current or voltage signal, input into the DCS, after transformation, restore the original value, such as the current value displayed in the DCS; The secondary value of the current transformer (5A) is converted into a 4-20mA signal by the current transmitter (5A corresponds to 20mA), which is input to the DCS cabinet, and the actual current value is displayed in the DCS after conversion. (2) AO signal: analog output In contrast to AI, AO is the DCS output 4-20mA or 0-10V signal to control the operating parameters of the device; For example, the speed control process of the frequency converter, taking 40HZ as an example, through remote DCS control, that given the parameter value: 40HZ, DCS also sends a corresponding analog current value, in the range of 4-20mA (20mA corresponds to 50HZ), the signal is passed to the controller of the frequency converter, and the frequency converter runs at 40HZ as required.
2.1 Power drive unit The power drive unit first rectifies the input three-phase power through the three-phase full bridge rectifier circuit to obtain the corresponding direct current, and then converts the inverter into controllable alternating current to drive the servo motor. The whole process of the power drive unit can be simply said to be the AC-DC-AC process. The main topological circuit of the rectifier unit (AC-DC) is the three-phase full-bridge uncontrolled rectifier circuit. 2.2 Control Unit The control unit is the core of the whole AC servo system, which realizes the system position control, speed control, torque and current controller. In addition to fast data processing capabilities, the digital signal processor (DSP) also integrates A wealth of application-specific integrated circuits for motor control, such as A/D converter, PWM generator, timing/counter circuit, asynchronous communication circuit, CAN bus transceiver, high-speed programmable static RAM and large capacity program memory. 2.3 Drive control Mode (1) PWM control (Shadik driver) PWM control technology: control the on-off and off-off of semiconductor switching devices, so that the output end can get a series of pulses with equal amplitude and unequal width, and use these pulses to replace sine waves or other required waveforms. By modulating the width of each pulse according to certain rules, the output voltage of the inverter circuit can be changed, and the output frequency can be changed.
The company focuses on DCS, PLC, robot, large servo four systems
The main products are various modules/cards, controllers, touch screens, servo drivers Company advantage: Supply imported original products, professional production of spare parts One year warranty, fast delivery time, complete supply !！！ ① 24 hours email response (12 hours); ② For shipment outside Asia, please contact the seller.
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