Operating instructions

Functions
7.6 Motor control
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
211
7.6.2.3 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
Commissioning the torque control
The torque control only functions error-free if, during the basic commissioning, you correctly
parameterized the motor data and performed the motor data identification with the motor in
the cold state.
You can find the basic commissioning in the following sections:
● Commissioning with the BOP-2 (Page 63)
● Commissioning with STARTER (Page 68)
Table 7- 27 The most important torque control parameters
Parameter Description
P1300 = … Control type:
20: Vector control without speed encoder
22: Torque control without speed encoder
P0300 …
P0360
Motor data is transferred from the rating plate during basic 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 function
diagrams 6030 onwards in the List Manual.