描述
在逆變橋的模塊當中,若igbt的某一個結擊穿,都會形成短路保護,嚴重的可使橋臂擊穿,甚至于送不上電,前面的斷路器將跳閘。這種情況一般只允許再送一次電,以免故障擴大,造成更大的損失,應聯(lián)系廠家進行維修。
(3)變頻器內(nèi)部干擾或檢測電路有問題
有些機子內(nèi)部干擾也易造成此類問題,此時變頻器并無太大的問題,只是不間斷的、無規(guī)律的出現(xiàn)短路保護,即所謂的誤保護,這就是干擾造成的。
變頻器的短路保護一般是從主回路的正負母線上分流取樣,用電流傳感器經(jīng)主控板的檢測傳至主控芯片進行保護的,因此這些環(huán)節(jié)上任何一處出現(xiàn)問題,都可能造成故障停機。
對于干擾問題,現(xiàn)低壓大功率的及中高壓變頻器都加了光電隔離,但也有出現(xiàn)干擾的,主要是電流傳感器的控制線走線不合理,可將該線單獨走線,遠離電源線、強電壓、大電流線及其他電磁輻射較強的線,或采用屏蔽線,以增強抗干擾能力,避免出現(xiàn)誤保護。
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