一般來說，當變頻器輸出電壓超出額定值的5%時，就需要進行調整。但是有些廠家對此沒有嚴格規定，可以調整到30%~50%左右（變頻器大允許輸出電壓為220V）。但如果用超出額定值很多，變頻器將無常工作。另外，當變頻器沒有輸出電壓時，應使用合適的電流表測量電源電流是否在額定電流內。 檢查主回路接線 主回路的接線主要有三種方式：一是主電路與控制電路之間采用隔離；二是主電路與控制電路之間采用隔離變壓器；三是控制回路中的開關電源直接給主電路供電。對于種情況，使用隔離變壓器可以將控制回路和主回路隔開，提高控制回路的可靠性。 第二種情況，如果有足夠大的空間，可以采用隔離變壓器，但由于成本原因一般不推薦使用。 第三種情況比較特殊，一般不建議采用隔離變壓器。 控制回路中的開關電源給主電路供電的方式比較常見的是1)將主回路開關電源直接給負載供電；2)經隔離變壓器降壓后給負載供電。
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