Efficient Networks Siemens Sinamics S120 - Manual (Page 124)

Vector control
4.5 Speed controller pre-control and reference model
Drive Functions
124
Function Manual, (FH1), 07/2007 Edition, 6SL3097-2AB00-0BP4
● p1459 adaptation factor upper
● p1466 CI: Speed controller P gain scaling
Speed-dependent Kp_n/Tn_n adaptation (VC only)
● p1460 Speed controller P gain adaptation speed, lower
● p1461 Speed controller P gain adaptation speed, upper
● p1462 Speed controller integral action time adaptation speed, lower
● p1463 Speed controller integral action time adaptation speed, upper
● p1464 Speed controller adaptation speed, lower
● p1465 Speed controller adaptation speed, upper
Dynamic response reduction field weakening (SLVC only)
● p1400.0 Speed control configuration: Automatic Kp/Tn adaptation active
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:
GW
GQ
 S  S   S
GW
GQ
-   S PY ವ ವ ವ ವ ವ
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.