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andy.f:
A vector drive is essentially a variable frequency to an AC induction motor. See:
http://www.reliance.com/pdf/drives/w...pers/D7161.pdf
Incoming AC line is converted to DC and from this DC the vector drive generates the desired AC variable frequency.
Your 245 V might be slightly above what the nominal value should be, but solve your low voltage power supply problem first.
What you need in your plant is a heavy (maybe 0000 gauge to minimize electrical noise voltages) copper ground wire that connects all electrical equipment together and at the service entrance connects to a grounding system. Individual ground rods at machines without safety grounding wiring between all electrical equipment is not safe. See the US National Electrical Code.
Is your power source a 3 phase delta or "Y", and how is it grounded?
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