Torque Control - Siemens SINAMICS G120 Operating Instructions Manual

Setting functions
8.5 Motor control
8.5.3

Torque control

Torque control is 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
Commissioning the torque control
The torque control only functions error-free if, during the basic commissioning, you correctly
set the motor data and performed the motor data identification with the motor in the cold
state.
See also Section: Basic commissioning with STARTER (Page 85).
Table 8- 24
Parameter
p1300
p0300 ...
p0360
p1511
p1520
p1521
p1530
p1531
Additional information about this function is provided in the parameter list and in function
diagrams 6030 onwards in the List Manual.
254
The most important torque control parameters
Description
Control mode:
20: Vector control without speed encoder
22: Torque control without speed encoder
Motor data is transferred from the rating plate during basic commissioning and
calculated with the motor data identification
Additional torque
Upper torque limit
Lower torque limit
Motoring power limit
Regenerative power limit
Converter with the CU250S-2 Control Unit (vector)
Operating Instructions, 06/2013, FW V4.6, A5E31759476B AB