Off3 Torque Limits - Siemens SINAMICS S120 Function Manual

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Basic functions

8.15 OFF3 torque limits

OFF3 torque limits

Function description

If the torque limits are externally specified (e.g. tension controller), then the drive can only be

stopped with a reduced torque. If stopping in the selected time p3490 of the infeed unit has not

been completed, the infeed unit shuts down and the drive coasts down. In order to avoid this

behavior, there is a binector input (p1551), that for a LOW signal, activates the torque limits

p1520 and p1521. This means that the drive can brake with the maximum torque by

interconnecting the signal OFF 3 (r0899.5) to this binector.

Function diagrams (see SINAMICS S120/S150 List Manual)

Overview of important parameters (see SINAMICS S120/S150 List Manual)

● p1520[0...n]

● p1521[0...n]

Servo control - Motoring/generating torque limit

Servo control - Upper/lower torque limit

Vector control - Upper/lower torque limit

Torque limit upper/motoring

CO: Torque limit lower/regenerative

Function Manual, 06/2019, 6SL3097-5AB00-0BP2

Drive functions