Siemens Sinamics G120 CU240E, Operating Instructions Manual, Page: 114 / 238

Functions
5.7 Closed-loop control
Frequency inverter
114
Operating Instructions, 08.10. 2008, t.b.d.
5.7.2.3 Torque control
Torque control is always part of the vector control and normally receives its setpoint from the
speed controller output. By deactivating the speed controller and directly entering the torque
setpoint, the closed-loop speed control becomes closed-loop torque control. The inverter
then no longer controls the motor speed, but the torque that the motor generates.
Typical applications for torque control
The torque control is used in applications where the motor speed is specified by the
connected driven load. Examples of such applications include:
●
Load distribution between master and slave drives:
The master drive is speed controlled, the slave drive is torque controlled
● Winding machines
Steps when commissioning the vector control
1. Carry out quick commissioning (P0010 = 1)
In order to ensure that the vector control functions perfectly, it is absolutely imperative
that the motor data are correctly entered
2. Run the motor identification routine (P1900 = 2)
The motor identification routine must be carried out with the motor in the cold state. Motor
identification must be carried out after the quick commissioning as the quick
commissioning supplies output data for the motor model and the motor identification
makes these even more precise
Table 5- 25 The most important torque control parameters
Parameter Description
P0003 = 2
Extended access to the inverter functions
P1300 = 22 Control type: Torque control without speed encoder
P300 …
P360
Motor data are transferred from the motor rating plate during the quick commissioning
and calculated with the motor data identification
P1452 = … Smoothing the actual speed
P1511 = … Additional torque
P1520 = … Upper torque limit
P1521 = … Lower torque limit
P1530 = … Motoring power limit
P1531 = … Regenerative power limit
Additional information about this function is provided in the parameter list and in the function
diagrams 7200, 7700 and 7900 in the List Manual.