Siemens SINAMICS S120 Function Manual page 238

Vector control
5.8 Torque limiting
These cyclic values therefore limit the torque setpoint at the speed controller output / torque
input or indicate the instantaneous maximum possible torque. If the torque setpoint is limited
in the Motor Module, this is indicated via the following diagnostic parameters:
● r1407.8 CO:/BO: Status word speed controller: Upper torque limit active
● r1407.9 CO:/BO: Status word speed controller: Lower torque limit active
Function diagrams (see SINAMICS S120/S150 List Manual)
• 6060
• 6630
• 6640
238
Vector control - Torque setpoint
Vector control - Upper/lower torque limit
Vector control - Current/power/torque limits
Function Manual, 11/2017, 6SL3097-4AB00-0BP5
Drive functions