Siemens SINAMICS S120 Function Manual page 832

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Applications

11.4 DCC axial winder

Limitation of the speed controller output with dynamic speed limits

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 can be operated with an overdriven speed controller. In so doing,

the speed setpoint is calculated as a function of the diameter (see DCA block). The control

signal of the tension controller is set to the torque limits. This means that in normal operation

the drive operates at the torque limit. In case of a web break, this prevents the tension

controller from actively building torque. The winder speed is limited by the speed setpoint.

Limitation of the speed controller output with dynamic speed limits (example of SERVO)

See 6060 for VECTOR application.

Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3

Drive functions