Stall Protection (Only For Vector Control) - Siemens Sinamics S120 Function Manual

8.4

Stall protection (only for vector control)

If, for closed-loop speed control with encoder, the speed threshold set in p1744 for stall
detection is exceeded, then r1408.11 (speed adaptation, speed deviation) is set.
If the error threshold value set in p1745 is exceeded when in the low speed range (less than
p1755 * (100% - p1756)), r1408.12 (motor stalled) is set.
If one of the two signals is set, then after the delay time in p2178, fault F7902 (motor stalled)
is output.
Figure 8-2
Function diagrams (see SINAMICS S120/S150 List Manual)
● 6730 Current control
● 8012 Torque messages, motor blocked/stalled
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● r1408 CO/BO: Control status word 3
● p1744 Motor model speed threshold stall detection
● p1745 Motor model fault threshold value stall detection
● p1755 Motor model without encoder, changeover speed
● p1756 Motor model changeover speed hysteresis
● p2178 Motor stalled delay time
Drive functions
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
Stall protection
Monitoring and protective functions
8.4 Stall protection (only for vector control)
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