Off3 Torque Limits - Siemens Sinamics S120 Function Manual

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OFF3 torque limits

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 has not

been completed, the infeed shuts down and the drive coasts down.

In order to avoid this, 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)

● 5620 Motor/generator torque limits

● 5630 Upper/lower torque limit

● 6630 Upper/lower torque limit

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

● p1520 Torque limit, upper/motoring

● p1521 Torque limit, lower/regenerative

Technology function: friction characteristic

The friction characteristic curve is used to compensate the friction torque for the motor and

the driven machine. A friction characteristic enables the speed controller to be pre-controlled

and improves the response.

10 interpolation points are used for each friction characteristic curve. The coordinates of

every interpolation point are defined by a speed parameter (p382x) and a torque parameter

(p383x) (point 1 = p3820 and p3830).

● 10 interpolation points are available for mapping the friction characteristic curve.

● An automatic function allows you to record the friction characteristic curve (record friction

● A connector output (r3841) can be applied as friction torque (p1569).

● The friction characteristic can be activated and deactivated (p3842).

Drive functions

Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2

characteristic curve).

Basic functions

6.12 OFF3 torque limits

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