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

4.5

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 optimization. The acceleration is calculated from the speed
difference over the time "dn/dt".
Note
When speed controller optimization 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 4-9
Drive functions
Function Manual, (FH1), 01/2013, 6SL3097-4AB00-0BP3
p1400.2
p1495
1
0
p1496
1)
p1428 p1429
r1084
-
Speed controller with precontrol
4.5 Speed controller pre-control and reference model
p0341 p0342
r1518
K
p
1)
=0
>0
-
) 2
T
i
SLVC:
T
VC:
i
r1515
T
n
r1538
r0079
r1547[0]
r1547[1] r1539
) 2
T K
p
i
p1452 p1470 p1472
p1442 p1460 p1462
Vector control
T
n
181