Siemens 166 fault code meaning
Siemens / 166
Series: SIMODRIVE 611U
Coupling not possible
servo drive
Meaning: No coupling can be established in the actual operating status. For P0891=2 or 3, it is not possible to couple using the input signal ”Activate coupling through I0.x” (fast input).
Possible causes
Source: SIMODRIVE 611 universal Function Manual FBU 05/2010 (EN, Siemens official site) 7.3