High-speed refrigerated centrifuge mainly from the liquid mixture to extract the needed ingredients, according to the density of each substance, after a high-speed rotation, the density of the liquid in the bottom of Shenyang, the density of the liquid floating above, so that the liquid will be stratified , We need to extract the purity of the material. It applies to pharmaceutical, chemical and many other fields.

     There are two input system: speed input and temperature input. By the speed of light measurement code, every six to output pulse, using their control of the above-mentioned method. ADS90 by measuring the temperature, when the temperature is higher than 2 settings. C, the compressor start; When the temperature is set lower than the value of 2 ~ C, the compressor stop. In addition, the time control system, when the motor speed of more than 500 hours to the beginning of time. When the time set to reach down time. Output relay system has output of the inverter Kai / stop, start and stop compressors, control of door locks and D / A output of 0-5V or 0-IOV voltage control speed. There inverter fault detection failure, failure to open the door, the failure of balance, over-temperature fault, speeding fault. There watchdog system.

     In the debug prototype has been identified seven types of rotor control subroutine for a few thousand to 30,000 at the turn of the rotor. In the application, the user through the keyboard input by the user using the rotor model.

     A control system failure and mechanical failure, and so should be able to timely detect and report to the police, the closure of all control target, allowing the system to minimize losses. At the same time, detected in a number of non-production of the impact of failure, such as damage to the button, indicating abnormal, and so on, should prompt the police operator, but does not stop production

     Hydraulic pressure to achieve a balanced approach is used in both pressure and relief. When the pressure (the pressure of a real need for pressure) greater use of strong pressure, pressure relief zero output; less pressure to adopt a weak pressure, pressure relief zero output; negative pressure (the pressure of a real need for negative pressure ), Just to use as a zero pressure, pressure relief output. In theory this process is relatively simple, but the actual process control systems due to the lagging response to the phenomenon, which should be Algorithms in actual on-site commissioning will be adjusted in order to achieve the most satisfied with the results of the control.

  (1) as a result of the workshop next to a furnace and quench-frequency welding of a car to ask, the more serious industrial disruption to the normal work of the root system large impact, so that the regular procedure "to fly to run". To this end, we have taken a number of anti-interference measures. These include:

     a. Software anti-interference measures;

     b. In addition to the hardware used white reduction measures, and to strengthen the shield of isolation;

     c. Independent power supply (the source of interference and phase) or the installation of UPS power supply;

     d. Coil relay added IRC absorption circuit. With these measures, that system work properly, and then did not come out over the phenomenon of death.

  (2) of the sampling signal instability, affecting the reliability of control. Due to serious interference, affect the signal level ^ lose the stability of the samples led to a false signal, caused by the malfunction. We live in accordance with the emergence of the phenomenon, the first level together with the final hardware circuit filter solves this problem.

     The system is based AT89C51CPU controller monitoring system, the zinc oxide film production automation. After the commissioning of the system used in the production, so that the rate of qualified products to more than 98%, has greatly enhanced economic efficiency. After two years, the use of the system is stable and reliable, never broke down.