I. Foreword In the control system of HYT-1040H optical lens oven produced by Xiamen Huayitong Ultrasonic Equipment Co., Ltd., the imported instruments were used before, and the price is high. In order to reduce the cost and achieve the same control effect, the technology is carried out. The reform, using domestic instruments, selected the AI ​​instrument produced by Yudian Company as an alternative instrument. Second, the system requirements 1, the control temperature accuracy requirements ± 1 ° C; 2, when the temperature is lower than a certain value A, the two groups of thermal cycle system power is fully open, and above this value A, according to the temperature to adjust the output, the The value A can be set; 3. The upper deviation alarm output; 4. The heating system adopts PID control; 5. When the temperature is 50~200°C, the output is 4~9mA. 3. The system structure According to the system requirements, we choose AI. -808AX4XL2L2 as the main temperature controller, the system structure block diagram is as shown below: The main output of the AI-808 table is used as the control signal of AIJK6 to control the heating output; the auxiliary output is the transmission output, which is used as the control signal of the inverter 1. The analog output of the inverter 1 is used as the control signal of the inverter 2, so that the inverter 2 follows the inverter 1. 4. Instrument selection and function The AI-808 regulator also has manual/automatic bumpless switching operation function based on the AI-708 regulator, with manual auto-tuning and display output values, and as a direct servo amplifier. Controls the proportional output of the valve position. In this system, the AI-808 meter is used for temperature detection of the air conditioning unit and forward and reverse control of the servo motor. The specific model is AI-808AX4XL2L2. The specific module functions are as follows: X optically isolated linear current output module; X4 optically isolated linear current output module, and does not occupy the instrument's internal isolated power supply; L2 relay contact switch (varistor absorption) output module. AIJK6 is an intelligent three-phase phase-shifting trigger and cycle zero-crossing trigger with single-chip technology. It has powerful functions and high reliability. It can adapt to various kinds of resistance wires, silicon carbon rods and silicon molybdenum rods whose load is reduced by transformer. Various industrial electric furnaces such as tungsten wire can also be used for motor soft start control. Its main features include: â— 0~20mA (0~5V)/4~20mA (1~5V) signal compatible input; â— When the load is resistive When it is sexual, its output power is proportional to the input signal; â—It has phase loss detection, overcurrent detection and alarm function; â—Automatic synchronization function, no phase sequence is required when connecting the thyristor trigger line; â—All-point isolation and "burning not bad" technology, the reliability is very high, causing little interference to the input end; â— Contains switching power supply, can be directly powered by 220VAC power supply, and has 5V and 24V two sets of DC power output. V. Parameter setting 1. AI-808 instrument parameter setting: According to the specific requirements, the main parameters of the AI-808 instrument are set as follows: HIAL 120 (value A) Use the upper limit alarm output to control the inverter speed reference switching, use the inverter The multi-function input is completed; the DHAL 5 system requires a positive deviation alarm of 5 degrees; Ctrl 1 uses AI artificial intelligence adjustment; Sn 0 input is a K-scale thermocouple; DIL 50 inputs the lower limit display value, here to send the transmission The temperature corresponding to the lower limit of the output; DIH 650 input upper limit display value, here the temperature value corresponding to the upper limit of the transmission output; OP1 4 4 ~ 20mA linear current output; ALP 1 upper limit alarm is output by AL2, positive deviation alarm is output by AL1; 2 Automatically adjust the state and prohibit manual operation; 2. Setting of ALJK6 AIJK6 is set by a 6-bit DIP switch: the first bit is used to select the input signal specification, and the OFF is the input is 0~20mA or 0~ 5V, ON means that the input signal is 4~20mA or 1~5V, and the input of voltage or current is selected by jumper. In this system, the input signal is 4~20mA, so the first bit is set to ON. Status; The second wiring mode is selected, it is set correctly before leaving the factory, no need to change, AIJK6 should be in the ON state; the third bit is used to select the phase shift/zero-crossing trigger mode, and the OFF is the phase shift trigger. The system uses Phase shift trigger; The fourth bit is used for phase loss alarm. Set to OFF here to indicate that any phase missing phase or thyristor is broken down in the three phases; the fifth bit is used to select IN2 function for current feedback or adjustment. Soft start/soft stop delay time, the system is used to adjust the soft start/soft stop delay time, set to OFF. The sixth bit is used for special functions, set to OFF. There are also 2 jumpers on the AIJK6 board, select the main input respectively. Whether IN1 and IN2 are current input or current input, here is set as current input. 6. After the parameters of the instrument are set, the PID self-tuning is carried out. After the self-tuning is finished, the observation control effect is good enough to achieve the control effect of the imported instrument. Http://news.chinawj.com.cn
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