ABB AX645 3BHB001914R1 Axial displacement module

Optically isolated signal interface connection - optical isolation is provided on the step, direction and enable inputs in addition to the enabled output. The use of optical isolation increases the options available for system grounding. The source commanding the step and direction lines is not tied directly to the motor power supply ground, allowing the system ground point for these signals to be made external to the unit.

Digital Electronic Damping control 

- enables this patented feature which eliminates loss of torque and possible motor stalling conditions when operating at mid-range speeds. This instability is a phenomenon of the electronic, magnetic and mechanical characteristics of a stepping motor system. The compensation circuit damps mid-range oscillations by advancing or delaying switching of the output current relative to the incoming pulse train.

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