492超温跳闸
当变压器温度超过设定温度上限时,PLC给控制器发出一个故障信号,对变频器进行保护。接触器KM2. KM3断开, 把变压器及变频器切除.延时ns后QF1得电吸合.把旁路接入.电机由变频运行转至工频运行。
493主控制器故障
当控制箱发生故障时,PLC使接触器KM2、KM3断开.把变压器及变频器切除.延时ns后QF1得电吸合.把 旁路接入.电机由变频运行转至工频运行。
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