不可以,某些情况下这样做会损坏变频器或电动机。比如
・ 假如你在变频器运行期间打开开关,自感可引起过电流或过电压。
・ 假如你在变频器运行期间闭合开关,根据电机的状态可引起过电流。
由于以上原因,我们建议通常不要在变频器运行期间使用开关。
在特殊情况下偶尔使用开关时应注意以下几点安全事项:
根据VDE(德国电工联合会)规定,"紧急停车"功能可能是破坏性的。只能按以下步骤将电动机与变频器断开,你的"紧急停车"操作才是安全的。
1) 激活“OFF2”。
2) 约100ms后再打开电机接触器 。
(变频器运行时打开接触器会因自感损坏主回路)
3) 只要电机转动就必须避免重新闭合接触器(电机的剩余电压也可导致主回路损坏)。 所以这时同样要避免使用再起动回路。
4) 如需重新将变频器切回,必须先取消"ON"和"OFF"命令然后再重新发出"ON"命令。(接通禁止)。
对于检修开关,可在打开或闭合接触器之前,使用一个继电器接点给数字量输入端送出一个"OFF2"命令=禁止变频器输出。(自由参数化)。
变频器将在100ms内停止输出。通常,应注意此时所有继电器和接触器都应加装RC元件,否则会损坏变频器。

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