关键词 |
MMS6210 |
面向地区 |
MMS6210
MMS6210
MMS6210
变频器输入信号中包括对运行/停止、正转/反转、微动等运行状态进行操作开关型指令信号。变频器通常利用继电器接点或具有继电器接点开关特性元器件(如晶体管)与PLC)相连,到运行状态指令。
使用继电器接点时,常常接触不良而带来误动作;使用晶体管进行连接时,则需考虑晶体管本身电压、电流容量等因素,系统可靠性。设计变频器输入信号电路时还应该注意,当输入信号电路连接不当时也会造成变频器误动作。例如,当输入信号电路采用继电器等感性负载时,继电器开闭产生浪涌电流带来噪音有可能引起变频器误动作,应尽量避免。
变频器中也存一些数值型(如频率、电压等)指令信号输入,可分为数字输入和模拟输入两种。数字输入多采用变频器面板上键盘操作和串行接口来给定;模拟输入则接线端子由外部给定,通常0~10V/5V电压信号或0/4~20mA电流信号输入。接口电路因输入信号而异,变频器输入阻抗选择PLC输出模块。
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厦门本地通讯模块热销信息