6SE7022-1EP60变频器
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面议
6SE7022-1EP60变频器
③输出对输入的影响有滞后现象。PLC采用集中采样、集中输出的工作方式,当采样阶段结束后,输入状态的变化将要等到下一个采样周期才能被接收,因此这个滞后时间的长短又主要取决于循环周期的长短。此外,影响滞后时间的因素还有输入滤波时间、输出电路的滞后时间等。
④输出映像寄存器的内容取决于用户程序扫描执行的结果。
⑤输出锁存器的内容由上一次输出刷新期间输出映像寄存器中的数据决定。
⑥PLC当前实际的输出状态由输出锁存器的内容决定。
6SE7022-1EP60变频器
软启动器在起动电机时,通过逐渐增大晶闸管导通角,使电机起动电流从零线性上升至设定值。对电机无冲击,提高了供电可靠性,平稳起动,减少对负载机械的冲击转矩,延长机器使用寿命。
有软停车功能
即平滑减速,逐渐停机,它可以克服瞬间断电停机的弊病,减轻对重载机械的冲击,避免高程供水系统的水锤效应,减少设备损坏。
起动参数可调
根据负载情况及电网继电保护特性选择,可自由地无级调整至佳的起动电流。
6SE7022-1EP60变频器
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