Siemens SINAMICS G220 - Page 510

Description of function
*EDPOUSPMMFS
*RDPOUSPMMFS
4QFFETFUQPJOU
$BMDVMBUFETQFFE
BDUVBMWBMVF
&ODPEFSMFTTWFDUPS
DPOUSPM

7FDUPSDPOUSPM
XJUIFODPEFS

.FBTVSFETQFFE
BDUVBMWBMVF
.PUPSBOEDVSSFOUNPEFM

$BMDVMBUFTQFFE
MJNJUT

5PSRVF
TFUQPJOU
.FBTVSFE
WPMUBHF
.FBTVSFE
DVSSFOU
0VUQVUGSFRVFODZ
0VUQVU
WPMUBHF
7PMUBHFBOHMF
4MJQ

4QFFEDPOUSPMMFS


5PSRVF
QSFDPOUSPM
.BYJNVNTQFFE
$BMDVMBUFBDDFMFSBUJ
POUPSRVF
5SBOTGPS
NBUJPO
5SBOTGPS
NBUJPO
'MVYTFUQPJOU
6QQFSUPSRVFMJNJU
-PXFSUPSRVFMJNJU
$VSSFOUMJNJU
1PXFSMJNJUXIFOHFOFSBUJOH
4UBUJDUPSRVFTFUQPJOU
4VQQMFNFOUBSZBDDFMFSBUJPOUPSRVF
1PXFSMJNJUXIFONPUPSJOH
$BMDVMBUF
UPSRVFMJNJUT





Q
,
1
5
*
Q
Q
Q
Q
Q
Q
Q
1)
Only for induction motors
2)
Choice of control mode
3)
Settings required
Figure14-116 Simpli󹪝ed function diagram for speed control with a speed controller
The converter uses the motor model to calculate the following closed-loop control signals
from the measured phase currents and the output voltage:
• Current component I
d
• Current component I
q
• Speed actual value for encoderless speed control
The setpoint of the current component I
d
(󹪞ux setpoint) is obtained from the motor data.
For speeds above the rated speed, the converter reduces the 󹪞ux setpoint using the 󹪝eld
weakening characteristic.
At an increase of the speed setpoint, the speed controller responds with a higher setpoint
of the current component I
q
(torque setpoint). How the closed-loop control responds to the
higher torque setpoint depends on the motor type:
• For induction motors, the closed-loop control adds a higher slip frequency to the output
frequency. The higher output frequency also results in a higher slip in the motor, which is
proportional to the accelerating torque.
• For synchronous motors, the closed-loop control increases the load angle instead of the slip.
Functions
14.10Closed-loop drive control
SINAMICS G220 converter
508 Operating Instructions, 04/2024, FW V6.2, A5E51781573B AB