因而要根据正本的供电电压选择适合的控制电源接线端子，将原出厂时空出的两根接线或接在电压最高端(出厂时按最高电压试验)的两根线接在原电压等级的端子上，因有两个变压器，都要进行改接。如图3示。

(2)接主线
按配线标准，将电源线接在变频器的三相输入(或符号r、s、t)端子上，电机线接在变频器的三相输出(或符号u、v、w)端子上，地线接在变频器上标有“⊥”的端子上。并将相应的罗栓拧紧。
2.调试
(1)将柜门上的阻隔开关拉下，并将柜门上的“变频发起”按扭旋开，使其呈断开情况。提示送电后，用mf—47型或500型万用表的高压挡“2500v”档测量三相输入电压(必定留心安全)，应在规矩的计划内，并三相互相平衡，若不精确，应停电查看供电电源。
(2)电源正常后，合上阻隔开关闸刀，用万用表查看控制电源的220v电压(测量里边的接线插盒即可)是不是在规矩的计划内，按其±20%的动摇，应在220v±20v计划内，若超出此计划，应拉下高压阻隔开关的闸刀，调整控制变压器的接头，直至满足恳求间断。

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