Efficient Networks S120 Activating, Deactivating, Servo control 3.15 Dynamic Servo Control DSC

Servo control 3.15 Dynamic Servo Control (DSC)

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Figure 3-23 Control principle using DSC

Activating

If the prerequisites for DSC are met, the DSC structure is activated through a logical combination of the parameters p1190 "DSC position deviation XERR" and p1191 "DSC position controller gain KPC" through a selected suitable PROFIdrive telegram.

If KPC = 0 is issued, only speed control with the speed pre-control value (p1430, typically N_SOLL_B) can be used. Position controlled operation requires a transfer of KPC > 0.

When DSC is activated, it is recommended to use a new setting for the position controller gain KPC in the master.

When DSC is activated, the channels p1155 and p1160 for the position setpoint values as well as the channel for the extended setpoint value are not used.

The p1430 value for speed pre-control is still taken into account.

Deactivating

If both KPC = 0 (p1191=0) and XERR = 0 (p1190 = 0) are set, the DSC structure is dissolved and the "DSC" function is deactivated. In this case, only the value from p1430 from speed pre-control is taken into account.

Since it is possible to set higher gain factors using DSC, the control loop can become unstable when DSC is disabled. For this reason, before deactivating DSC, the value for KPC in the master must be reduced.

Drive Functions	107
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4