I bought the EM806 digital drivers as a modern alternative to the older M542 analogue drivers to make use of the digital drivers' features, mainly resonance control and stall detection, which is what my question was asking about. In brief, in a dual-axis setup, do you disconnect one ball nut while tuning the other axis, just take the target motor's drive belt off, or what? And should the driver's fault signal go back to the motion controller (quick response but relies on motion controller firmware to stop machine) or safety relay which will respond slightly more slowly but more reliably?