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這是西門子MM430，MM440系列變頻器的常見故障，這種情況下要先檢測送電電源電壓是否正常。如果正常，再檢查控制接線是否有短路。前面兩項都排除如果還存在故障，說明變頻器開關電源損壞，需要專業維修機構進行檢查和修復。
I go to see everyday some blogs and sites to read posts,
but this weblog provides feature based writing.
Feel free to surf to my blog post - online cialis