Freezing The Speed Raw Value - Siemens SINAMICS S120 Function Manual

Basic functions
7.19 Tolerant encoder monitoring
7.19.3

Freezing the speed raw value

If, for high speed changes, the dn/dt monitoring function responds, then the "freeze speed
raw value" function gives you the opportunity of briefly specifying the actual speed value
therefore equalizing the speed change.
Commissioning
1. Set parameter p0437.6 = 1 to activate the "freeze speed raw value" function.
Sequence
1. If the dn/dt monitor responds, the alarm A3x418 " Encoder x: Speed difference per
sampling rate exceeded"
2. A frozen actual speed value limited to just two current controller cycles is supplied.
3. The rotor position continues to integrate
4. The actual value is released again after two current controller cycles
x = encoder number (x = 1, 2 or 3)
1)
336
is output.
1)
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions