N-controller PI/P
For certain applications the N-controller is set at PI or P control. Mostly this is fix for the whole
application.
Example:
· Speed master of a continuous Line: N-controller => PI
· Slave motor (Load Share Control) of a Bridle: N-controller =>P
If necessary (enable by these parameters (U273.0 CUVC, U472.0 DC-master)) a switch between
PI and P is possible, with the control signal “PI/P-Ncontr” (CTLW2 control word, bit0).
This switch is possible in RUN mode of the drive.
Sequence, switch PI => P:
· Before N-controller is enabled (I-action is enabled)
· First free block cycle: Disable N-controller
· Second free block cycle: Set I-part N-controller at zero and hold I-part fix.
· Third free block cycle: Re-enable the N-controller (I-action is hold at zero)
So when a switching from PI => P, the N-controller is disabled during two (free block) cycles.
Sequence, switch P => PI:
· First free block cycle: Enable I-part N-controller. The N-controller stays enabled.



Load Balancing Control LSC
The load sharing control with common I-Part is realized in the standard drive.
Rotational-speed controlled drives (e.g. bridle roll drives) that are mechanically coupled with the
strip require that load balancing be done in the drive group.
In this case, one drive of the bridle roll group operates as master. The master assigns the
desired torque. All other drives in the drive group are slave drives. They follow the torque of the
master drive either directly (i.e. 100% master torque @ 100% slave torque) or in a specific
parameterized relationship, for example 1:2 (i.e. 100% master torque @ 50% slave torque).