I. Introduction
In the control system of HYT-1040H optical lens oven production by Xiamen Hua Yitong Ultrasonic Equipment Co., Ltd., the foreign import instrument has been used, and the price is high. In order to reduce costs and achieve the same control effect, technical reform is carried out. Domestic instruments, the AI instrument produced by YuCo company is used as a replacement meter.
Second, the system requirements
1. Control temperature accuracy requirements ± 1 ° C;
2. When the temperature is below a certain value A, the 2 sets of thermal cycling system power is fully open, and when higher than this value A, the value A can be set according to the temperature.
3, with the upper deviation alarm output;
4, the heating system adopts PID control;
5, when the temperature is 50 ~ 200 ° C, the transfer output 4 ~ 9mA
Third, system structure
According to system requirements, we selected AI-808AX4XL2L2 as the main temperature controller.
With the control signal of the AI-808 table as the control signal of Aijk6, the heating output is controlled; the auxiliary output is the transmission output, and the control signal of the inverter 1; the simulation output of the inverter 1 as the control signal of the inverter 2, so The inverter 2 works with the inverter 1.
Fourth, instrument selection and function
The AI-808 regulator also has a manual / automatic free disturbance switching operation function, and has a manual self-tuning and display output value, and the proportional output used as the servo amplifier directly controls the position of the valve position. The temperature detection of the air conditioning unit is used in this system to perform temperature detection of the air conditioner set and the forward and reverse rotation control of the servo motor. The specific model is AI-808AX4XL2L2. The specific module function is as follows:
Linear current output module of x photoelectric isolation;
X4 photoelectrically isolated linear current output module, and does not occupy internal isolation power supply in the meter;
L2 relay contact switch (pressure sensitive resistance absorption) output module.
Aijk6 is an intelligent three-phase shift trigger and peripheral cross-zero-use trigger that applies a single chip technology. It is highly reliable to adapt to various resistance wire, silicone bod, and load using transformer buck-down silicon rods. Tungsten wire and other industrial electric furnaces can also be used for the control of soft start-up of motor, and the main features include:
● 0 ~ 20mA (0 ~ 5V) / 4 ~ 20mA (1 ~ 5V) signal compatible input;
● When the load is resistant, its output power is proportional to the input signal;
● Have a short-phase detection, overcurrent detection and alarm function;
● Automatic synchronization feature, no need to connect to the controllable silicon contact line;
● The use of full-scale isolation and "burn is not bad" technology, the reliability is very high, causing a small interference to the input;
● Include the switching power supply, can be powered directly with 220VAC power supply and have 5V and 24V two sets of DC power output.
V. Parameter settings
1, AI-808 Instrument parameter setting:
According to the specific requirements, the main parameters of the AI-808 meter are set as follows:
HIAL 120 (value a) uses the upper alarm output to control the switching of the drive speed, and use the multi-function input of the inverter to complete;
DHAL 5 system requires a positive deviation alarm within 5 degrees;
Ctrl 1 adopts AI artificial intelligence adjustment;
SN 0 is input to a thermocouple of k degrees;
DIL 50 Enter the lower limit display value, here the temperature value corresponding to the lower limit of the output;
The DiH 650 inputs the upper limit display value, here the temperature value corresponding to the maximum output upper limit;
OP1 4 4 ~ 20mA linear current output;
The ALP 1 upper limit alarm is output by the AL2 and the positive deviation alarm is output by the AL1;
Run 2 automatically adjusts the status and prohibits manual operations;
2, set of aljk6
The setting of Aijk6 is set by a 6-digit DIP switch:
* Bit is used to select an input signal specification, and OFF indicates that the input is 0 to 20 mA or 0 to 5V, ON indicates that the input signal is 4 to 20 mA or 1 to 5V, the input signal is input, and the input is selected, input in the system. The signal is 4 ~ 20mA, so set the * bit to the ON state;
The second-bit wiring mode is selected, and it has been set correctly before the factory, does not need to be changed, and the AIJK6 should be in the ON state;
The third bit is used to select the phase / cross-zero trigger, and the OFF indicates the shift trigger, the system uses a phase shift trigger;
The fourth place is used for phase fault alarms, which is set to OFF indication of the three-phase, as long as any of the phases or the thyristor is broken down;
The fifth bit is used to select the IN2 function as current feedback or adjust the soft start / soft stop delay time, which is set to OFF;
The sixth bit is used for special functions and set to OFF.
Sixth, conclusion
After the instrument parameter is set, the PID is self-tuning. After the end of the finalization, the observation has good control effect, enough to achieve the control effect of the import instrument.
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