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

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In Topic: Alsom Mv3000 3 X Parallel Connected Problems

02 May 2011 - 05:36 AM

Hi Mark,

Thanks for the quick response.
The system was working for 4 yrs and it has a controller common for all 3 drives together so did'nt bother to check the tuning. I just took the scope readings of all 3 phases of all 3 drives after disconnecting all cables to the motor (2880 KW) and two drives the pattern on U phase and W phase found different -- like firing only negative cycle or positive cycle where as the V phases all looks same -- but cannot trust scope due to harmonics---When checked with Alstom, they advise me to change all drives and delivery tome is 20 to 26 week so trying all my best as in Alstom UK has also all new young lads..

Kindly advise