Siemens SINAMICS S120 Function Manual page 550

Applications
11.5 Tolerant encoder monitoring with SMC30
The correction also works on external encoders operating as a master value encoder in the
drive line-up (correction of position value X_IST1 from a direct measuring system).
Freezing of the raw speed value when the dn/dt monitor responds
This function is activated with parameter setting p0437.6.
● Bit status 0: Function disabled (default).
● Bit status 1: Function active
If the dn/dt monitor responds, the message A31418 " Encoder 1: Speed difference per
sampling rate exceeded" is output and a frozen actual speed value limited for the duration of
3 current controller cycles is supplied.
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● p0404[0...n] Encoder configuration operative / Enc_config operative
● p0405[0...n] Rectangular signal encoder track A/B / rectangular signal encoder A/B
● p0408 Rotary encoder pulse number
● p0437[0...n] Sensor Module extended configuration
● p0438[0...n] Rectangular signal encoder filter time
● r0452[0...2] Rectangular signal encoder filter time display
● r0458[0...2] Sensor Module properties
● r0459[0...2] Sensor Module extended properties
● p4680[0...n] Zero mark monitoring permissible tolerance
● p4681[0...n] Zero mark monitoring tolerance window positive limit
● p4682[0...n] Zero mark monitoring tolerance window negative limit
● p4686[0...n] Zero mark minimum length
550
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions