Torque Mode - Siemens SINAMICS PERFECT HARMONY GH180 Function Manual

8.21

Torque Mode

8.21.1 Torque Mode
Torque mode is added for applications needing this specialized feature. Torque reference is input
through analog input 3 or the network. It is a modified, saturated speed loop algorithm allowing
the torque to be controlled through the torque limit, with fall-back into speed mode, should the
torque requirement suddenly drop. This prevents a dangerous runaway condition caused by
applying a fixed torque with no speed control. The speed ramp is bypassed in this mode for faster
response, and the torque ramp is enabled to control application of torque changes. Speed droop
is disabled in torque mode.
If the VFD is used in torque mode, the speed regulation must be done externally to the VFD. The
input to the drive in this type of application is a torque demand. Figure Torque Mode depicts a
generalized view of torque mode.
Figure 8-26
Note
Speed Demand
The speed demand is set to the motor speed limit as shown in Figure Torque Mode.
The Torque Demand can be sent to the VFD in one of three ways:
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Torque Mode
Advanced Operating Functions
8.21 Torque Mode
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