Siemens CU240B-2 - Advanced Settings

Advanced commissioning
6.5 Motor control
Converter with the CU240B-2 and CU240E-2 Control Units
250 Operating Instructions, 01/2016, FW V4.7 SP6, A5E34259001B AC
6.5.2.3
Advanced settings
K
P
- and T
I
adaptation
K
p
and T
I
adaptation suppress speed control oscillations that may occur. The "rotating
measurement" of the motor data identification optimizes the speed controller. If you have
performed the rotating measurement, then the K
p
- and T
n
adaptation has been set.
You can find additional information in the List Manual:
● Vector control with speed controller: Function diagram 6050
● Vector control after presetting the application class Dynamic Drive Control Function
diagram 6824
Droop
For mechanically coupled drives, there is the risk that the drives oppose one another: Small
deviations in the speed setpoint or actual value of the coupled drives can mean that the
drives are operated with significantly different torques.
The droop function ensures even torque distribution between several mechanically coupled
drives.
The droop function reduces the speed setpoint as a function of the torque setpoint.
Image 6-35 Effect of droop in the speed controller
When droop is active, the ramp-function generators of all of the coupled drives must be set
to have identical ramp-up and ramp-down times as well as rounding-off.
Par.
Explanation
r1482
Speed controller I torque output
p1488
Droop input source
(factory setting: 0)
0: Droop feedback not connected
1: Droop from the torque setpoint
2: Droop from the speed control output
3: Droop from the integral output, speed controller
p1489
Droop feedback scaling
(factory setting: 0.05)
A value of 0.05 means: At the rated motor torque, the inverter reduces the speed by 5% of
the rated motor speed.
r1490
Droop feedback speed reduction
p1492
Droop feedback enable (factory setting: 0)