How to reduce the unnecessary loss DCS failure?

DCS system consists of system software and hardware, operation desk tray and field instruments. Any link in the system appear problem, partial function will result in system failure or trigger control system failure, serious will cause production stop. As for parking & hellip; … Losses must not small. In fact, quite a number of DCS fault is caused by the small details of some daily, in daily application, if to strengthen the control of these small details, you can avoid the considerable losses from DCS malfunction. So what are the need to be aware of? Small make up carefully organize the related content, hope to be of help. Fault source have? First you take a look at the DCS often appear what fault source. Human error until today in development of DCS technology has been more mature, modular degree is high, statistics show that the hardware itself the probability of failure is relatively low, so DCS hardware and software failures mostly man-made: due to the improper configuration, improper operation caused by human factors such as fault. Information security domain is no longer safe control in the pure land, click here to view the security risk control in the power failure in the process of automation instrument operation, in the event of system power failure, would be a deadly threat posed to the DCS system. Plug contact undesirable, standby power supply can't automatic switch, circuit breaker capacity lack, automation instrument circuit load does not match, power supply circuit accidents and exist the problems of the circuit element damage will cause the system power failure. Common effects include power supply, voltage sag, overvoltage, undervoltage, etc. High voltage is easy to burn out the card and low voltage is easy to cause the card can't work normally, the board trouble light alarm, the phenomenon such as abnormal signal output. Power supply directly to paralyze the DCS system. Electromagnetic interference DCS application in the field of industry characteristics, determines the DCS system is mostly formed by high voltage equipment of electromagnetic environment, the applications to eliminate the interference sources and improve the anti-interference ability of DCS system itself is often unrealistic. Grounding bad bad easily lead to DCS in jump, when affected by electromagnetic interference signal drift, serious when may result in the card is damaged. Temperature and humidity affect the high temperature, low temperature, dry and wet work environment will be enormous impact to the system, DCS components susceptible to the influence of the environment and the failure or performance degradation. With the experimental results show that the analog card, every 10 ℃, the temperature change will reduce the accuracy of 0. 1%; And more than 65% relative humidity, will form a layer of water film on surfaces, make the insulation deterioration, and accelerate the corrosion; The relative humidity is too low, synthetic materials easily become fragile, contraction, the surface crack is easy to be damaged. Electrostatic effect insulation surface easy to accumulate electrostatic: because the use of large scale integrated circuit, the current card chip pressure resistance is weak, so the electrostatic discharge may cause the card chip failure. And this kind of damage has certain concealment, latent, easy to be ignored. The corrosive gas corrosion influence site, as well as some built on the sea ( If the plant) Affected by wind erosion, influence on DCS interface card and computer operation station is often fatal. Serious corrosion of industrial environment, often can cause DCS electronic components for the board and the computer motherboard short-circuit, cause hardware damage. Lightning effects when the control room of the building lightning proof device on the flash, powerful moment lightning flow down lead into the grounding device, can make the local ground potential float, if lightning protection grounding device is independent and it if there is not enough and the control system of grounding distance, between the two will produce discharge ( Counter) To interferences with DCS control room or damage. Other hazards such as dust and rat, which will cause serious damage to DCS equipment and lines. Problem of how to prevent? First of all, before the DCS installation must attach much importance to the engineering design and construction phase of the work. Such as lightning-proof, earth shield, etc. , in the DCS parameter to modify these more difficult, so the problems after transformation is much less than the problems before the corresponding measures. Design should choose the reasonable structure of earthing, such as the potential single point grounding way; Construction should refer to relevant standards use the correct method of grounding connection.