AB1756-OA16IPLC模块Rockwell罗克韦尔Allen-bradley

1756-OA16I

1756-OA16I

1756-OA16I

1756-OA16I

目前常用的再起动方法是采用专用的自起动柜或单机再起动继电器。自起动柜硬件成本高，接线复杂。单机再起动继电器成本稍微降低，但是需要增加接线，且再起动失败几率也较高，还会在正常停车后发生误起动。

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PCS－9692及PCS－9626微机可编程电机保护装置结合石化企业电机运行特点，提供了一种可靠、经济的电机（群）再起动方法。
1 失电再起动逻辑

本文描述的再起动逻辑借鉴了高压线路保护中自动重合闸原理，再起动逻辑严谨。全数字化再起动过程定值设定灵活， 支持多种控制方式的电机再起动（如直接起动、正反起动和高低速电机起动等），装置的开入开出可组态，逻辑都在软件里实现，使现场接线非常简单。模拟量采样用24点全波傅里叶算法，准确度高。装置采用高性能32位CPU，每个采样间隔0.833 ms实时计算，反应速度大大快于传统的重起动装置和PLC。

1.1 失电再起动逻辑

在电机（群）静止状态下上电起动会对电网造成冲击，拉低母线电压， 造成低电压保护跳闸或因电压太低烧坏电机。正常运行的电机失电后，由于惯性还会继续旋转一段时间。旋转中的电机起动电流较小，不会将电压拉低太多，因此恢复供电后可以立即起动电机。完全停止的电机再起动需要根据厂用电的负荷进行分批再起动，如厂用电允许同时起动10台电机，就每次10台分批进行再起动。

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