Siemens SINAMICS S120 Function Manual page 556

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Applications

11.6 DCC axial winder

Adaptation of the torque limits by means of tension controller

This method is often used in winder applications to prevent the winder from running away if

the web breaks.

For this purpose, the drive is operated with speed controller override, with the speed setpoint

being calculated as a function of diameter (see DCA block). The control signal of the tension

controller is set to the torque limits, which causes the drive to operate at the torque limit in

normal mode. In case of a web break, this prevents the tension controller from actively

building torque. The winder speed is limited by the speed setpoint.

Function diagrams (see SINAMICS S120/S150 List Manual)

● 5042 Servo control, speed controller, torque/speed pre-control with encoder

● 5060 Servo control, torque setpoint

● 5210 Servo control, speed controller without encoder

● 5610 Torque limiting/reduction/interpolator

● 5620 Motor/generator torque limit

● 6031 Vector control, pre-control balancing

● 6060 Servo control, torque setpoint

Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5

Drive functions