Re: [CAD_CAM_EDM_DRO] 160VDC G320

> Really, I think a stenciled warning on the case to not use without
> isolation transformer would be good enough.

I think that despite the fact that motion control systems embody
substantial danger, we tend to treat the isolation-transformer-less
spindle drives installations with more respect. Those wires are more
likely to be in grounded armored cable, to go to UL listed motors,
originate in UL listed drives, and sometimes even be installed by
licensed electricians.

This is not to say that one cannot treat 'live' motion control
components safely, only that I can agree with the fear that they are
less likely to always be given sufficient respect as an electrocution
hazard.

Imagine this: an uninformed individual working on a CNC machine comes
across a motor whose nameplate rating is for less than 12 volts. How
is he to know that in order to make this motor work at speed, the
control system may deliver as much as 160 volts? And that due to
lack of an isolation transformer, line-level voltage may be present
even when the motor is stationary?

Chris Stratton