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VFD is not encouraged to be mounted with MCC usually, because it creates certain problems.
To understand the issues related to that problems kindly refer to the following 2 links. hopeful you will find enough information.
http://ecmweb.com/content/are-you-sure-you-want-put-your-vfds-your-mccs
http://toshont.com/ag/vfddesign/AG33EM.pdf
noise issue,( due to power wiring & control wiring), heat generates from vfd.......need (Igbt,scr capacitors),other one is space constraints
