Siemens SINAMICS S120 Function Manual page 128

Vector control
4.3 Speed controller
To suppress any vibrations that occur in the speed controller, it is usually only necessary to
increase the smoothing time in p1452 for operation with an encoder or p1442 for operation
without an encoder or reduce the controller gain.
The integral output of the speed controller can be monitored via r1482 and the limited
controller output via r1508 (torque setpoint).
Note
In comparison with speed control with an encoder, the dynamic response of drives without
an encoder is significantly reduced. The actual speed is derived by means of a model
calculation from the converter output variables for current and voltage that have a
corresponding interference level. To this end, the actual speed must be adjusted by means
of filter algorithms in the software.
Function diagrams (see SINAMICS S120/S150 List Manual)
● 6040 Speed controller with/without encoder
Overview of important parameters (see SINAMICS S120/S150 List Manual)
● p0340[0...n] Automatic calculation of motor/control parameters
● p1442[0...n] Speed controller actual speed smoothing time
● p1452[0...n] Speed controller actual value smoothing time (SLVC)
● p1460[0...n] Speed controller P gain lower adaptation speed
● p1462[0...n] Speed controller integral time lower adaptation speed
● p1470[0...n] Speed controller encoderless operation P gain
● p1472[0...n] Speed controller encoderless operation integral time
● p1960 Rotating measurement selection
● r0062 CO: Speed setpoint after the filter
● r0063[0...1] CO: Speed actual value
● r0345[0...n] Nominal motor starting time
● r1482 CO: Speed controller I torque output
● r1508 CO: Torque setpoint before supplementary torque
128
Function Manual, (FH1), 10/2008, 6SL3097-2AB00-0BP5
Drive functions