Agreed, I have never seen a high voltage DC drive bus leg connected to ground.  That could cause all kinds of problems!


On 7/12/2018 5:31 PM, andy pugh wrote:
On 12 July 2018 at 20:12, John Dammeyer <> wrote:
Is it standard practice to connect the DC Servo and DC Instrumentation Bus
to the machine frame ground which is connected to power line earth?  Or is
it more normal practice to keep the DC isolated from the 'earth' ground.
I think it might be a good idea to keep the high voltage DC bus
separated from Signal Ground. I don't know this for a fact and I am
only mentioning it because the other replies seem to be glossing over
that part of the question.

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