Siemens 508 fault code meaning

Series: SIMODRIVE 611U

Zero pulse monitoring (motor measuring system)

servo drive

Meaning: The measured rotor position fluctuates between 2 encoder zero marks (encoder lines may have been lost). Note: The encoder monitoring function can be disabled using P1600.8.

Possible causes

Source: SIMODRIVE 611 universal Function Manual FBU 05/2010 (EN, Siemens official site) 7.3