VLT2880PT4B20STR3DBF00A00 summary：
The torque control function is used in applications where the torque on motor output shaft is controlling the application as tension control. Torque control can be selected in 1-00 Configuration Mode, either in VVC+[4] Torque open loop or Flux control closed loop with [2] motor speed feedback. Torque setting is done by setting an analog, digital or bus controlled reference. The max speed limit factor is set in 4-21 Speed Limit Factor Source. When running torque control, it is recommended to make a full AMA procedure as the correct motor data are of high importance for optimal performance.
• Closed loop in Flux mode with encoder feedback offers superior performance in all 4 quadrants and at all motor speeds.
• Open loop in VVC+
The function is used in mechanical robust applications, but the accuracy is limited. Open loop torque function works basically only in one speed direction. The torque is calculated on basic of current measurement internal in the frequency converter.
Speed/torque reference
The reference to these controls can either be a single refrence or be the sum of various references including relatively scaled references.
