Siemens SINAMICS S120 Function Manual page 382

Basic functions
7.20 Tolerant encoder monitoring
Fault profile
382
Fault description
Zero mark too wide
EMC faults
Zero mark too early/late
(interference pulse or
pulse loss on the A/B
track)
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Remedy
Use edge evaluation of
the zero mark
Use an adjustable hard-
ware filter
For faults, use pole
position adaptation or
pulse number correction
Drive functions