Torque Limiting - Siemens SINAMICS S120 Function Manual

6.8

Torque limiting

Function description
The torque limiting value specifies the maximum permissible torque. Different limits can be
parameterized for motoring and generating operation.
Figure 6-13
● p0640[0...n] Current limit
● p1520[0...n] CO: Torque limit upper/motoring
● p1521[0...n] CO: Torque limit lower/regenerative
● p1522[0...n] CI: Torque limit upper/motoring
● p1523[0...n] CI: Torque limit lower/regenerative
● p1524[0...n] CO: Torque limit upper/motoring scaling
● p1525[0...n] CO: Torque limit, lower/regenerative scaling
● p1530[0...n] Motor mode power limit
● p1531[0...n] Regenerative mode power limit
The currently active torque limit values are displayed in the following parameters:
● r0067 CO: Output current maximum
● r1526 Torque limit, upper/motoring without offset
● r1527 Torque limit, lower/regenerative without offset
All of the following limits apply to the torque setpoint, which is present either at the speed
controller output in the case of speed control, or at the torque input in the case of torque control.
The minimum/maximum value of the different limits is used in each case. This minimum/
maximum is cyclically calculated and displayed in the following parameters:
● r1538 CO: Upper effective torque limit
● r1539 CO: Lower effective torque limit
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
Drive functions
Function Manual, 06/2019, 6SL3097-5AB00-0BP2
Signal flow: Torque limitation
Vector control
6.8 Torque limiting
235