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外文翻译--系统的设计功能.doc
System structure and control scheme
system design features The control system of ventilation units with centrifugal activation of interlocking and over-temperature protection. And conventional relays compared to the implementation of the ventilation system, PLC system has a low failure rate, high reliability and wiring is simple, easy maintenance and many other advantages, PLC control functions so that thventilation systems greatly enhance the degree of automation, reducing the labor jobs intensity. PLC and frequency converter with the use of air pressure transmitter, allowing the system to control the security, reliability, greatly improved, but also run the fan significantly reduce the failure rate, not only saves energy but also improve the operation rate of equipment. Mine ventilation system to meet the requirements of automatic control system the specific design requirements are as follows: (1) This system provides manual / automatic mode of the two, with a state of alarm display and features such as faults. (2) Analog PID operator via pressure input, output analog converter control. (3) In the automatic mode, when the downhole pressure below the set pressure limit, two sets of fans will be running to work at the same time, at the same time and issued instructions and alarm signals. (4) Analog input gas, when the gas concentration is greater than the upper limit of alarm settings, and report to the police to give directions. When the gas concentration is greater than the upper limit of power settings, PLC will cut off the face and wind power generating units to prevent the gas explosion. (5) The use of temperature sensors measured temperature or the wind bearing unit stator temperature, bearing temperature or when the stator temperature exceeds the set alarm on the line, give directions and warning signals. When the stator temperature or the wind bearing temperature exceeds the set temperature of the line unit conversion, PLC will
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