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sir i have multidrive vfd acs800-04-1160-07 in which we are facing problem of fault ff51 line converter fault ...i noticed one thing that incoming supply coming to dsu is 690 V through fuses and their fuses keep blowing whenever we give kick and dsu also show many faults like dc overvoltage,current unbalance then we checked all the thyristor of both dsu in which we fine leakage in thyristor therefore we repace it but problem still persist..please suggest your valuable ideas ...
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