摘要：本文主要介绍了四方V560高性能变频在双吊点启闭机主从控制上的应用，成功的解决了两台以上电机同时驱动一个刚性负载时，容易造成负载分配不均匀的问题，合理的解决了一台电机拖动另一台电机工作的现象。
关键字：启闭机；双吊点；变频器；V560
一、RELIANCE 803.65.00 BOARD引言
近年来，随着国家建设的大力发展，启闭机在电力建设、水利建设、运输港口上的应用越来越广泛。当启闭机在起吊比较宽的闸门的时候，单吊点就不能满足闸门启闭的要求，这时我们就要用到双吊点结构型式的启闭机来起吊闸门。
四方V560系列高性能闭环矢量型变频器，可以实现高启动转矩和超低速运行。本文主要介绍如何将V560系列变频器成功运用于双吊点启闭机的主从控制。
二、RELIANCE 803.65.00 BOARD系统概述
以江门某水电站中的启闭机举例说明，现场为2×1500KN固定卷扬式启闭机，采用双吊点结构形式，由两套直径为Φ900mm的卷筒分别带动一套起重吊具。每套机构分别由一台75kW电动机通过一个硬齿面卧室减速器带动卷筒转动。两套机构之间通过联轴器和刚性轴联接，以保持两吊点起升的同步性。两套机构由一个液压制动器控制抱闸。
电气系统上由于异步电机滑差的特性决定了在两台以上电机同时驱动一个刚性负载时，会发生负载分配不均的现象，严重的情况下甚至可能在轻负载状态下发生一台电机拖着另一台电机工作，一台电机处于电动状态，一台电机处于发电状态的情况。为了避免这种情况，使启闭机每个吊点的负载均匀分配，双吊点启闭机每个吊点起升机采用变频主从控制方法，可以很好的解决以上问题。
三、RELIANCE 803.65.00 BOARD系统控制方案及配置
启闭机两套起升机构采用四方V560高性能矢量变频器，两台变频器均采用闭环矢量控制，主变频器做速度控制，从变频器作转矩控制，主变频器的两个模拟量AO1、AO2输出端子分别输出频率指令和转矩指令，频率指令用0~10V信号，转矩指令用-10V~10V信号。从变频器的AI1端子接受主变频的AO1端子输出信号作为速度限制，从变频的AI3端子接受主变频器的AO2端子输出信号作为转矩指令。当开始工作的时候，主变频器驱动负载会产生一个实际的内部转矩指令，将此转矩指令输出给做转矩控制的从变频器，从变频器也会输出一个同样大小的转矩，这样两台变频器输出的转矩一样，就不会出现负载不均衡的现象。主变频器的频率指令输出给从变频器作为速度限制，RELIANCE 803.65.00 BOARD如此从变频器的速度就被限制在和主变频器当前相同的运行速度。

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