Speed Controller Pre-Control And Reference Model - Siemens SINAMICS S120 Function Manual

Vector control

5.5 Speed controller pre-control and reference model

5.5 Speed controller pre-control and reference model
Speed controller precontrol
The command behavior of the speed control loop can be improved by calculating the
acceleration torque from the speed setpoint and connecting it on the line side of the speed
controller. The torque setpoint "mv" is calculated as follows:
This torque setpoint "mv" is applied to the current controller or the current controller is
precontrolled using adaptation elements directly as additive reference variable (enabled via
p1496).
The motor moment of inertia p0341 is calculated directly during commissioning or when the
entire set of parameters is calculated (p0340 = 1). The factor p0342 between the total
moment of inertia J and the motor moment of inertia must be determined manually or by
means of speed controller tuning. The acceleration is calculated from the speed difference
over the time "dn/dt".
Note
When speed controller tuning is carried out, the ratio between the total moment of inertia and
that of the motor (p0342) is determined and acceleration precontrol scaling (p1496) is set to
100%.
When p1400.2 = p1400.3 = 0, precontrol balancing is set automatically.
Figure 5-9
202
Speed controller with precontrol
Function Manual, (FH1), 04/2014, 6SL3097-4AB00-0BP4
Drive functions