Efficient Networks S120 manual 287

Function modules

7.10 DCC axial winder

A variable torque limit is effective (fixed torque limit + scaling).

0 signal from BI: p1551:

The fixed torque limit is effective.

p1552[0...n] Torque limit upper scaling without offset / M_max up offs scal

Sets the signal source for the scaling of the upper torque limit to limit the speed controller output without considering current and power limits. A possible source is the torque preset from the DCC diagram.

p1554[0...n] Torque limit lower scaling without offset / M_max low offsScal

Sets the signal source for the scaling of the lower torque limit to limit the speed controller output without considering current and power limits. A possible source is the torque preset from the DCC diagram.

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 S 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

Drive Functions	287
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4