Advanced commissioning
7.5 Motor control
Converter with control units CU250D-2
152
Operating Instructions, 04/2015, FW V4.7.3, A5E34261542B AB
7.5.2.4
Advanced settings
K
p
- and T
n
adaptation
The K
p
- and T
n
adaptation suppresses possible speed controller oscillations. During basic
commissioning, the inverter optimizes the speed controller using the "rotating measurement"
function. 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, function block diagram 6050.
Droop
The droop function reduces the speed setpoint as a function of the torque setpoint.
Figure 7-19 Effect of droop in the speed controller
The droop function ensures even torque distribution between two or more mechanically
coupled drives. Load distribution using the droop function also masters soft mechanical
couplings or a permanent speed difference as a result of slip.
Preconditions for using the droop function
●
All coupled drives must be operated in vector control, with or without an encoder.
●
Only a one common ramp-function generator may be used for mechanically coupled
drives.
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)
You can find additional information in the List Manual, function block diagram 6030.
