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歐陸變頻器報故障seqpreready,SEQPREREADY維修,變頻器啟動不了維修,直流調速無顯示維修,590直流調速故障seqpreready,SEQPREREADY 0XF003,OXF003 SPDFEEDBACK,spdfeedback 3PHASEFAILED三相電源故障 勵磁反饋(FIDLDFBK)編碼器(ENCODER) 勵磁故障(FIELDFAIL) 速度
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