Analog noise that follows the robot dress pack — ground loop or shield?
The question
Analog torque on a rotating tool. Noise appears when the 6-axis sweeps past 120°. New dress pack. Shield terminated at both ends per the drawing. Is that the wrong rule on a moving bundle?
TS ControlsThe answer
Moving bundle: shield at the cabinet end only unless the OEM insists otherwise, and never through a drag-chain with a VFD motor lead in the same slot. 120° is often where the pack rubs a bracket and becomes a second ground. Inspect the jacket. Don't 'filter' a scrape.
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