Closed-Loop Torque Control - Siemens SINAMICS G150 Operating Instructions Manual

Setpoint channel and closed-loop control
7.4 Vector speed/torque control with/without encoder
7.4.5

Closed-loop torque control

Description
For sensorless closed-loop speed control (p1300 = 20) or closed-loop speed control with
encoder VC (p1300 = 21), it is possible to change over to closed-loop torque control using
BICO parameter p1501. It is not possible to change over between closed-loop speed and
torque control if closed-loop torque control is directly selected with p1300 = 22 or 23. The
torque setpoint and/or supplementary setpoint can be entered using BICO parameter p1503
(CI: torque setpoint) or p1511 (CI: supplementary torque setpoint). The supplementary
torque acts both for closed-loop torque as well as for the closed-loop speed control. As a
result of this characteristic, a pre-control torque can be implemented for the closed-loop
speed control using the supplementary torque setpoint.
Note
No assignment to fixed torque setpoints
For safety reasons, assignments to fixed torque setpoints are currently not possible.
Note
Regenerative energy without feedback capability
If energy is regenerated and cannot be injected back into the line supply, then a Braking
Module with connected braking resistor must be used.
Figure 7-21
The total of the two torque setpoints is limited in the same way as the speed control torque
setpoint. Above the maximum speed (p1082), a speed limiting controller reduces the torque
limits in order to prevent the drive from accelerating any further.
460
Closed-loop speed/torque control
Converter cabinet units
Operating Instructions, 07/2016, A5E03347396A