优势产品:AB
PLC:1756/1747/1746/1769/1785系列
变频器:20AC/20BC/20DC/20F1/20G1/22A/22B/22D/22F系列
触摸屏:2711/2711P系列
软启动:150F/150C系列
伺服电机,控制器:MPL/MPM/2094系列
伺服电缆:2090系列
电源:1606系列
安全产品:440E/440N/440L/440K/440G/440R/440系列
低压产品:442L/100/445L/700/800T/802T/855E系列
SIEMENS
PLC:6ES7200/300/400系列
定位器:6DR系列
触摸屏:6AV系列
ENTEK:1440/EK系列 ABB定位器
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变频技术以其在节能与恒压方面的优越性能可以解决水压控制系统存在的以上题目。考虑选用单片机或PLC与变频器结合为核心构成的系统都能达到较好的控制效果。但在软件设计上,PLC比单片机的编程更简洁、直观;从硬件接口考虑,单片机电路稍微复杂一些;从经济方面考虑,由于PLC工艺的日渐成熟,要根据现场情况调整系统参数,PLC的软件中时间参数的调整更简单,这样更有利于售后服务职员把握。基于系统运行现状,本着既能节能降耗,又能控制简便、安全且投资较少的原则,选用了西门子MM430变频器和罗克韦尔PLC-5型PLC作为控制核心,再加上PSW7调节器与WSP300压力变送器,控制效果非常好,软件设计简单,硬件接口简易可行、可靠性高,整个系统的性价比非常高。具体如图2所示。
罗克韦尔PLC-5是本系统的核心控制器件,它不仅辨识、处理各种运行状态,进行系统间的逻辑运算和联锁保护,还对输进的多个模拟信号进行处理、运算后,输出标准的模拟信号控制变频器的运行速度。主程序结构较复杂,其中,对液位信号进行PID运算的子程序,原理图和程序框图如图3、图4所示。
图3 PID原理图
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Agilent HP 83485B 30 GHz Optical / 40 GHz Electrical Module
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Dassault AT Portable Credit/Debit Card Machine & Printer TPC-E232 w/ Base Unit
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GYYR High-Density Time-Lapse Recorder TLC2196HD
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JC Systems User's Instruction Manual for FastTrac 620 Programmer/Cont?roller
Tektronix P6046 Probe & Amplifier Instruction Manual w/ Service Manual
Conner Seagate 48/96GB SCSI DDS-2 Autoloader Tape Drive CTL96G-S
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Omega 115V Temperature Controller BS5001J1
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13/40/100 KHz IF Demodulator Module 17903 Assy 520-010-804 Rev L
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Lucent Avaya 5V 60A Power Unit 631DA1
Shure Automatic Microphone System Mixed AMS4000
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HP 3563A Control System Analyzer Operating Manual Volume I & II
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