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Member Since 30 Apr 2011
Offline Last Active May 02 2011 05:47 AM

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Alsom Mv3000 3 X Parallel Connected Problems

30 April 2011 - 09:03 AM

We have 3 Alstom AC drives coupled together to a single motor (MV 3000 = MVDL 1000 x 3 Nos) on our ship, now when the motor running at very slow speed (Vector mode), it knocks and stops as if some mechanical gear locking and on one of the 3 drives coupled together one of the Phase U or W trips on a High current or on current imbalance. 4 Yrs this was running with out any problem. For testing purposes When we diconnet all drive output and run one one at slow rpm it does not lock but cannot incresae speed as motor is 2800 kw. Connect two or 3 drives together then again it starts knocking and braking & trips.
Appreciate some one could respond on this subject from your vast experience.
Mahesh ohmy.gif