Operating instructions
Functions
5.7 Closed-loop control
CU240S and CU240E Control Units, FW 3.2
114 Operating Instructions, 03/2009, A5E02440075B AA
5.7.2.3 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
Steps when commissioning the torque control
1. Carry out quick commissioning (P0010 = 1)
In order to ensure that the torque control functions perfectly, it is absolutely imperative
that the motor data is entered correctly.
2. Run the motor data identification (P1900 = 2)
The motor data identification must be carried out with the motor in the cold state. The
motor data identification must be carried out after the quick commissioning as the quick
commissioning supplies output data for the motor model and the motor data identification
makes these even more precise.
Table 5- 35 The most important torque control parameters
Parameter Description
P0003 = 2 Extended access
P1300 = … Control type:
20: Vector control without speed encoder
21: Vector control with speed encoder
22: Torque-vector control without speed encoder
23: Torque-vector control with speed encoder
P0300 …
P0360
Motor data are transferred from the motor rating plate during the quick commissioning
and calculated with the motor data identification
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.
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