531X175SSBAYM2 铁树开花

发布时间:2019-11-18
  例1,某变频切换控制系统,变频器启动运行正常,而邻近液位计读数偏高,一次表输入4mA时,液位显示不是下限值;液位未到设定上限值时,液位计却显示上限,致使变频器接收停机指令,迫使变频器停止运行。
    这显然是变频器的高次谐波干扰液位计,干扰传播途径是液位计的电源回路或信号线。解决办法:将液位计的供电电源取自另一供电变压器,谐波干扰减弱,再将信号线穿入钢管敷设,并与变频器主回路线隔开一定距离,经这样处理后,谐波干扰基本抑制,液位计工作恢复正常。
    例2,某变频控制液位显示系统,液位计与变频器在同一个柜体安装,变频器工作正常,而液位计显示不准且不稳,起初我们怀凝一次表、二次表、信号线及流体介质有问题,更换所有这些仪表、信号电缆,并改善流体特性,故障依然存在,而这故障就是变频器的高次谐波电流通过输出回路电缆向外辐射,传递到信号电缆,引起干扰。 解决办法:液位计信号线及其控制线与变频器的控制线及主回路线分开一定距离,且柜体外信号线穿入钢管敷设,外壳良好接地,故障排除。

531X175SSBAYM2 铁树开花
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