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Static quality testing equipment for small-diameter flow control system analysis and measures interference factors


, Radio waves,[link widoczny dla zalogowanych], the external magnetic field,[link widoczny dla zalogowanych], electromagnetic induction method will cause interference on the control system, so the system is vulnerable to electromagnetic radiation of all the links must be well shielded and properly grounded. 2. Interference from the power supply and measures (1) the presence of electromagnetic field equipment such as: line hanging, air compressors, electromagnetic equipment, computer control system boot will cause interference, so computers and auxiliary equipment, power supply and electromagnetic devices power supply should be separated, at least not in the same outlet. (2) on-site voltage fluctuations, in order to ensure stable and reliable computer control system to run, and can in the case of grid power failure, save the test data, use the UPS power supply for computers and auxiliary equipment for power supply. (3) In order to suppress AC power to DC power supply system disturbance, flow meters and other instruments of power supply DC power supply. (4) for the suppression of electromagnetic induction, power leads as short, thick, using twist wire. 3. Interference from the signal source and measures the flow of pulse signal is low frequency signal, susceptible to external factors. (1) To avoid the influence of electric field, the flow pulse signal lines should be shielded cable. (2) To avoid the impact of the magnetic field, the flow pulse signal lines should use twisted wire, so that the two magnetic fields cancel each other online. (3) To avoid ground potential difference in rats through a common ground and the circuit when the interference must be taken to properly grounded. For the low-frequency signals, ground impedance is low, shall signal ground, power supply,[link widoczny dla zalogowanych], the shielding layer, the flow meter housing parallel point grounding. (4) signal lines and power lines to separate the layout, signal lines should be as close to the ground or land lines surrounding it. 4. Relay board and measures of interference control of a computer system, we designed a relay board, used to control the commutator action, pull the relay, disconnect cause electromagnetic interference, the right of counting plate count, Therefore, the relay board with a metal cover cover up, then the metal cover case, so that power lines, magnetic field lines will terminate at the metal enclosure. 5. Interference caused by mechanical vibration and measures weighing system is the core of the verification device, weighing system, including weighing tank, the load cell and the second table. Process of verification device according to the needs of weighing tanks, weighing sensor to be installed in the 3m tall weighing rack. Test, the liquid momentum and mechanical vibration caused by the inevitable interference of the weighing system, therefore, in the design of weighing tanks, aircraft weight, will weigh tank design in the center of gravity line, try to increase its stability, reduced due to mechanical Vibration caused by interference. 6. Counting board to improve anti-interference ability of the measured signal amplitude, frequency difference,[link widoczny dla zalogowanych], the choice of different specifications, models of counting board, according to the test site conditions and traffic device signals, the purchase of the PCL for a strong anti-interference ability 836 counting board, the counting board has a filtering function. 7. Affect the normal operation of the control system and measures of other factors (1) the power line, ground wire, the signal cable is bad, and if so, its connected. (2) flow meter pulse amplitude, frequency counter meets the requirements of the general counter low amplitude of the received pulse signal is less than 0.8V, 2.4V or less high than 5V. Flow from different manufacturers vary their specifications pulse signal, the amplitude of a 5V, and a 12V, 24V as well, and therefore can not be indiscriminate access, if the signal amplitude above the 5V, do a signal conversion board, the signal amplitude is converted to 5V. Flowmeter signal frequency is generally low, the counter can meet requirements. (3) Counter control terminal of the connection to the right, gate-side, through relay control, answering a high count does not count then low. Third, the concluding remarks static quality testing equipment for small-diameter flow control system, taken over by the anti-interference measures, operating normally, the computer automatically flow pulse signal acquisition, automatic control commutator action, to achieve the automation of the entire verification process. In the verification device control system, using anti-jamming measures also apply to other industrial control systems. Because this is a combination of instances of the verification device control system and measures to analyze the interference factors, and some other useful anti-jamming measures, such as: cut off the ground loop isolation transformer with the impact of the use of low-frequency digital optocoupler circuit isolation interference factors, Filters filter out interference signals, in which no detail can be applied with specific control system. References [1] Guang Wei, computer monitoring system for anti-jamming measures. Computer,[link widoczny dla zalogowanych], 1998.5 [2] (Japanese) Hiroshi Yamazaki Lang. Anti-jamming measures of electronic circuits. Beijing: Science Press, 1989 [3] (U.S.) Henry. Electronic system noise suppression technology. Beijing: China Railway Press, l978

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