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Plc In The United Compressor Protection System Application Suo by big tree
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Plc In The United Compressor Protection System Application Suo by BIG TREE
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| Article Posted: 09/16/2010 |
| Article Views: 22 |
| Articles Written: 1033 - MORE ARTICLES FROM THIS AUTHOR |
| Word Count: 653 |
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Plc In The United Compressor Protection System Application Suo |
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Business,Business News,Business Opportunities
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Computer and network technology, the rapid development of programmable logic controller caused changes in the structure and performance, programmable controllers have been deeply involved in machinery manufacturing, electrical control and production process control and other fields. This paper describes the programmable controller in the compressor interlock protection system, focusing on the PLC control system hardware and software applications.
Keywords: PLC Interlocking compressor Introduction: Programmable Logic Controller (PLC) is a combination of computer technology, automatic control technology and new communication technologies, a common control device. It has a strong functions, high reliability and easy to use, easy to program, and a number of advantages such as adaptability. In recent years, its industrial automation, mechatronics, traditional industries such as the application of technology more and more widely, as the three pillars of modern industrial control one. Its compact design, good scalability, low cost, powerful instruction as well as high reliability and easy maintenance, nearly perfect to meet the requirements of small-scale control. Compressor is the driving force of the core, to avoid the accident and from the perspective of the protection of the unit, the unit of temperature, pressure, and anti-surge design earthquake and so on a tight interlock program, the course of normal operation of the unit, once the control parameters exceeded or the safety factor against unit, the control system must be in accordance with the Interlock program deals with it accordingly. PLC processing power, scanning speed, anti-interference ability, in the units interlock protection system has been widely used. In this paper, the production of refrigeration cooling PP ice machine example describes the design and application of PLC chain protection.
One, the need for protection and interlocking compressor control requirements
Major role in the protection of United trivial when set in place during start and stop and run the equipment and endanger the personal safety of failure, automatically take protection or interlocking measures to prevent accidents and avoid accidents to expand production, thus ensuring the normal unit start and stop and safe operation. Work on the equipment through the state and close surveillance unit operating parameters, abnormal conditions, the time an alarm signal, if necessary, automatically activate or remove some of the equipment or system that allows units to maintain the original load and reduced load operation. Event of a major equipment failure and endanger the crew, stop unit (or any portion thereof) to run, to avoid further incidents. In the above compressor control, when the temperature is higher than 70 , inlet pressure below the 1Mpa, machine oil pressure is less than 0.5Mpa, the outlet pressure higher than the 9Mpa or press the emergency stop button the operator when, PLC start compressor Interlock protection program, the unit stops running.
Second, the hardware configuration 1, PLC hardware PLC use Siemens S7-300, S7-300 are modular PLC, mainly from the chassis, CPU module, signal module, communications processors, Power supply Module and the programming of facilities. The ice machine PLC control system hardware configuration, the power supply module used PS3075A, CPU use standard 315-2DP. Digital Input template selection SM321DI16x24VDC, digital output template used SM322DO8x24VDC/0.5A, analog input template used SM331AI8 × 12-bit, analog output template used SM332AO4 × 16 .
2, HMI Configure the touch screen interface. Use 5.7 "LCD screen with simple, intuitive display features touch screen to operate directly. Touch screen built-in universal port, a serial Communication cable Directly with the computer and Other With RS-232C port devices.
Production line in this set of practical applications for human-machine interface to set up production lines running status display, I / O control, manual operation, equipment operating instructions and automatic failure alarm and alarm to help so many images, and apply the operator level passwords and other functions. I am China Manufacturers writer, reports some information about pro street system requirements , engravable gifts.
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