Torque Setpoint Limitation - Siemens SINAMICS S120 Function Manual

Operating Modes
Servo control
3.1.5

Torque setpoint limitation

Description
The steps required for limiting the torque setpoint are as follows:
1. Define the torque setpoint and an additional torque setpoint
2. Generate torque limits
The torque setpoint can be limited to a maximum permissible value in all four
quadrants. Different limits can be parameterized for motor and regenerative
modes.
M_
setp before torque limiting
r
1509
Setpoint of the torque
generating current
_
setp
iq
[ .8]
5710
: Upper effective
CO
r
1538
[ .8]
5640
: Lower effective
CO
r
1539
[ .8]
5640
Torque factor M
[ .4]
5718
Fig. 3-9
Note
This function is effective immediately without any settings. The user can also
define further settings for limiting the torque.
3-72
- -
_2
torque limit
torque limit
2
iq
Current/torque setpoint limiting
[A]
The 4
quadrants
2
backwards
regenerative
backwards
motor
3
© Siemens AG, 2005. All rights reserved
SINAMICS S120 Function Manual, 06/05 Edition
M_setp total
r
0079
_set
iq
r
0077
M
+
1
forwards
motor
+
n
forwards
regenerative
4