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

Vector control

4.5 Speed controller pre-control and reference model

4.5 Speed controller pre-control and reference model
The command behavior of the speed control loop can be improved by calculating the
accelerating torque from the speed setpoint and connecting it on the line side of the speed
controller. This torque setpoint (mv) is calculated as follows:
The torque setpoint is switched/pre-controlled directly to the current controller via adaptors
as supplementary command variables (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 pre-control scaling
(p1496) is set to 100%.
When p1400.2 = p1400.3 = 0, pre-control balancing is set automatically.
Figure 4-10
156
p1400.2
p1495
1
0
p1496
1)
p1428 p1429
r1084
-
Speed controller with pre-control
p0341 p0342
r1518
K
p
1)
=0
>0
-
) 2
T
i
SLVC:
T
VC:
i
Function Manual, (FH1), 01/2012, 6SL3097-4AB00-0BP2
r1515
T
n
r1538
r0079
r1547[0]
r1547[1] r1539
) 2
T K
p
i
p1452 p1470 p1472
p1442 p1460 p1462
T
n
Drive functions