Advanced commissioning
7.5 Motor 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.
Figure 7-28 Simplified function diagram of the closed-loop torque control
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.
Converter with control units CU240D-2
Operating Instructions, 04/2015, FW V4.7.3, A5E34262100B AB
165
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