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DC converters SIMOREG

How is design if the incoming supply of 830Vac (armature) and 400Vac (field & Control unit) are not in same sources feeder?

Thread Starter: Import-User-1   Started: 6/15/2011 3:32 PM   Replies: 2

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  6/15/2011, 3:32 PM
Import-User-1
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Idut wrote:

We replaced the old Ward Leonard system for existing 830Vdc Motor by Simoreg 6RA7093-4LV62-0.   The three Simoreg for each DC Motor for application of Metal Conveyor Bar Mill .
How is design if the incoming supply of 830Vac (armature) and 400Vac (field & Control unit) are not in same sources feeder.  We are not install trafo 830/480Vac.
The 830Vac supply is from 2 unit transformers 6kV/830Vac parallel for 3 converter.

Thanks for your support
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  6/15/2011, 4:22 PM
KSN
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Hello.
I don't see the problem when armature and field supply are separate. But I think you need some protective switches at AC side to connect armature voltage to the drives.
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  7/8/2012, 12:15 PM
Prakash_shelar
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Dear , It is better to use 830/480 trafo to keep same source for armature , field and control as a system safe . Once i observed this separate supply feeder of 480 failed during drive run n armature was on , CCP capacitors burnt n fire was takeplace. U have to take care for disconnection of sources while different situations / conditions.
Thanks. 
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