石化行业是的支柱产业。其生产线较长、涉及面较广，仅在石化集团就有、成品油、天然气等输油、输气管道近上千公里，加油站几万个，石化企业中的油田、采油厂、化工厂、加油站、输油管线等遍布在全国各个城市和地区。自动化技术是石化行业中重要的技术之一，西门子新一代集成电压频率比控制、矢量控制及伺服控制功能于一体的SINAMICS系列交流传动系统基于新的传动理念，采用众多革新技术。其中西门子G120变频器适用于中等性能的开/闭环调速系统，该系列变频调速系统在石化行业中得到了广泛应用。PLC模块SIMATIC S7-400|492-2BX00-0AA0标签纸
PLC模块SIMATIC S7-400|492-2BX00-0AA0标签纸
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SINAMICS G120变频器应用方案
在石化行业中，应用变频器对风机，泵类负载进行变频调速控制，不但可以延长风机，泵类负载的使用寿命，同时可以节约电能，提供系统的安全性和可靠性。以泵类负载为例，使用SINAMICS G120系列变频器90KW对泵类负载的驱动电机进行变频控制，同时结合西门子S7-300系列PLC完成整个控制系统的自动化控制。
西门子变频器SINAMICS G120系列在工业自动化控制领域应用广泛，为用户提供高精度的速度控制或转矩控制。它采用模块化设计，提供了高度的灵活性，便于用户使用，维护，并可以在带电的情况下更换模块。同时它还具有强大的通讯功能，能和多个设备之间进行通讯，使用户可以方便的变频器的运行状态并修改参数。西门子变频器SINAMICS G120系列的核心是控制单元，用户通过设定控制单元上的参数来实现变频器的正常运行。用户可以通过操作面板来设定变频器的参数，本文下面对西门子变频器SINAMICS G120系列的参数特点做一个简单介绍，供用户在配置时进行参考。
PLC模块SIMATIC S7-400|492-2BX00-0AA0标签纸1、上电后面板显示[F231]或[F002](MM3变频器)，这种故障一般有两种可能。常见的是由于电源驱动板有问题，也有少部分是因为主控板造成的，
可以先换一块主控板试一试，否则问题肯定在电源驱动板部分了。
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