Alsom Mv3000 3 X Parallel Connected Problems
Posted 30 April 2011 - 09:03 AM
Appreciate some one could respond on this subject from your vast experience.
Posted 30 April 2011 - 09:27 AM
Have you checked the tuning of the drive to the motor?
This is very important in vector mode.
Some drives refer to this as an ID run.
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Posted 02 May 2011 - 05:36 AM
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..
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