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How to use torque control?

Version 4.4 by xingzhi lin on 2026/01/12 17:35

Introduction

The torque control of a VFD is similar in implementation to the torque control of a servo drive. However, in terms of underlying principles, VFD uses open-loop control (by judging the magnitude of the output current), while servo drive uses closed-loop control (by judging the magnitude of the feedback current).

Information

Note: VNZ100, VM don't support torque control.

Operation

For VB, VC, if you want to use torque control, you need to F0.00=0 first. Torque control needs to work in SVC mode.

Then, similar to the torque control mode of a servo, to ensure safety and avoid excessive speed when the load is suddenly reduced, which could cause runaway.

We need to set upper limiting frequency and lower frequency operating corresponding to F0.12 and F0.14.

For VB, set F3.09=1. And, for VC, set F3.46=1 to select torque control mode.