Optimizing The Closed-Loop Speed Controller - Siemens SINAMICS G120 Operating Instructions Manual

Advanced commissioning
6.18 Motor control
torque. I
the matching current component I
In order to achieve a satisfactory controller response, as a minimum, you must match the
subfunctions having a gray background as shown in the diagram above with your particular
application.
● Motor and current model: In the quick commissioning, correctly set the motor data on the
rating plate corresponding to the connection type (Y/Δ), and carry out the motor data
identification routine at standstill.
● Speed limits and torque limits: In the quick commissioning, set the maximum speed (p1082)
and current limit (p0640) to match your particular application. When exiting quick
commissioning, the inverter calculates the torque and power limits corresponding to the
current limit. The actual torque limits are obtained from the converted current and power
limits and the set torque limits.
● Speed controller: Start the rotating measurement of the motor data identification. You must
manually optimize the controller if the rotating measurement is not possible.
Default settings after selecting the application class Dynamic Drive Control
Selecting application class Dynamic Drive Control in the quick commissioning adapts the
structure of the vector control, and reduces the setting options:
Closed-loop torque control
without higher-level speed
controller
Droop
K - and T
P
Hold or set the integral com‐
ponent of the speed control‐
ler
Acceleration model for pre‐
control
Motor data identification at
standstill or with rotating
measurement
6.18.3.2

Optimizing the closed-loop speed controller

Optimum control response - post optimization not required
Preconditions for assessing the controller response:
● The moment of inertia of the load is constant and does not depend on the speed
● The inverter does not reach the set torque limits during acceleration
● You operate the motor in the range 40 % ... 60 % of its rated speed
286
and I controllers keep the motor flux constant using the output voltage, and adjust
q d
Vector control after selecting the appli‐
cation class Dynamic Drive Control
adaptation
I
Shortened, with optional transition into
in the motor.
q
Not possible
Not possible
Simplified
Not possible
Default setting
operation
Converter with the CU240B-2 and CU240E-2 Control Units
Operating Instructions, 01/2017, FW V4.7 SP6, A5E34259001B AD
Vector control without select‐
ing an application class
Possible
Possible
Advanced
Possible
Can be activated
Complete