[CT Bob]

On the shielded cable between VFD & spindle do you
attach the drain wire to VFD ground & spindle ?

Thanks
Bob

[RFB]

Bob,

I never run a drain wire on the 'service to' or 'output from' a VFD. When possible I run the high voltage lines in a metal conduit. I never run logic lines with high voltage lines. I always use a shielded cable with a drain on the logic lines. I ground the drain to earth ground. I never ground it at the VFD or axis drive amplifiers.

RFB

[Al_The_Man]

See ch6 on the current practice of connecting both ends of shield, appropriate equip-potential bonding must also be observed.
http://www.automation.siemens.com/do.../emv_r.pdf?p=1
Earth ground conductor should be taken to the VFD and continued on to the frame of the motor.
Al.

[CT Bob]

Thanks for the quick replies.

Bob