Optimizing The Speed Controller - Siemens SINAMICS G120 Operating Instructions Manual

8.5.2.3

Optimizing the speed controller

Optimum control response - post optimization not required
You do not have to manually adapt the speed controller, if, after the speed controller self
optimization, the motor manifests the following acceleration response:
Optimum control response for
applications that do not permit any
overshoot.
The actual value approaches the
setpoint, without any significant
overshoot.
Optimum control response for fast
correction and quick compensation of
noise components.
The actual value approaches the
setpoint and slightly overshoots
(maximum 10% of the setpoint step).
Control optimization required
In some cases, the self optimization result is not satisfactory, or the inverter cancels the self-
optimization routine with a fault. Further, self optimization is not permissible in plants and
systems in which the motor cannot freely rotate.
In these cases you must manually optimize the speed controller:
The examples listed below show you which variables you can use to adapt the control
response.
The basic procedure is described in the following paragraph for STARTER and BOP-2.
Depending on whether the control operates with or without encoder, different parameters
define the controller response.
Encoderless speed control
Speed control with encoder
Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB
K
p
p1470
p1460
Setting functions
8.5 Motor control
T
n
p1472
p1462
251