PCAD12/16H 532/100

PCAD12/16H 532/100
PCAD12/16H 532/100
PCAD12/16H 532/100

　采用变频器实现恒压供水已经算不上是新颖的应用，在自动控制领域这也算不上新课题，但是大多数恒压供水都是采用PLC 逻辑编程，使用变频器控制电机变频调速来实现恒压供水。本文详细介绍PowerFlex 400交流变频器在无需PLC控制器的情况下，完实现恒压供水的应用，将恒压供水这种典型的应用低成本化、益化。
　　二、解决方案说明：
　　在制定方案的选择上，本着节约能源、控制简单、应用方便的原则。该方案以恒压变频供水为控制核心，利用变频器的变频控制实现的恒压变频控制系统。
　　主要优点：
　　1. 无需PLC 控制器，变频器独立完成变频、工频之间的接触器切换;
　　2. 采用AB变频器实现变频调速和PID整定调节;
　　3. 电机的变频控制与工频控制之间可以周期性自动切换;
　　4. 对于电机设备可能出现的异常或是故障，本系统提供较好的备用处理方式：
　　①变频器故障时，可以切换到工频直接启动电机;
　　②电机故障时，可以切换到备用电机(3#电机为备用电机)，继续正常工作。
　　三、解决方案核心设备清单：
变频器介绍:
　　罗克韦尔自动化旗下艾伦-布拉德利PowerFlex400变频器拥有众多内置特性支持变频器与楼宇控制系统之间的无缝连接，大大方便了风机和泵类在商业领域的应用。本系统中主要应用PowerFlex 400变频器的以下功能特点：
　　5.1 PowerFlex 400变频器自带两路模拟量输入，两路模拟量输出;解决方案拓展讨论：
　　7.1 本方案只以2台电机变频、工频自动切换为主，介绍PowerFlex 400在恒压供水应用中的优势。实际上，在配置了辅助继电器卡后，多可以实现4台电机的切换控制;
　　7.2 本方案中变频器在启动2#工频电机时，对管道压力会有一个波动产生，对此可以通过变频器内部的基准值补偿的方法，控制这种波动的影响到;
　　7.3 单独变频器实现恒压供水的控制方案有别于其方案，无须逻辑编程。在方案实施过程中，要注意各个接触器之间的连锁控制，否则可能会造成设备的损坏。
　　八、结束语
　　变频器PowerFlex 400实现的恒压供水控制系统有着低成本、益、简单易用的优势，无需复杂的逻辑编程。
　　本文介绍的PowerFlex 400变频器的这一典型应用更突出了它的水泵应用的灵活性、性。这一特性为它在同行业的应用提供了可靠地实用案例和宝贵经验。

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