级联调速是为了使控制系统或操作人员能够调整轧线某一 相邻机架的速度关系，而不影响其他机架间已有的速度关系。控制系统应通过级联速度设定及自动级联调节相结合 的方式为各机架提供速度给定。速度级联系统通过主PLC 实现，级联速度设定是通过确定轧制线基准速度和各机架 延伸率，来确定各机架速度关系的，依逆自动级联调节是用活套调节器的有套量偏差，或微张力 控制时产生的速度修正信号，对相应的相邻机架，或级 联方向上含同一根钢的机架的速度进行修正，相关机架 间的设定速比不影响其它机架的速度配合关系。 由级联速度设定、自动级联调节综合产生的各机架线速 度，再根据对应机架的工作辊径及齿轮减速比等因素， 汇总折算为电机轴转速，然后线性变换为速度给定信号， 由主 PLC 通过 PROFIBUS 网传送给主传动速度调节装置 DV-300。速度级联关系应在前后两根钢之间断开时，
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