6-3 Overtorque/Undertorque Function
6-3-1 Overtorque/Undertorque Function Settings
Use this function to detect that the estimated motor output torque value exceeded the set level and out-
put the overtorque signal.
•
This function is enabled only when the 1st/2nd Control Method (A044/A244) is set to 03 (Sensorless
vector control).
•
To enable the detection of the overtorque/undertorque state, set the Multi-function Output 11/12
Selection (C021/C022), or Multi-function Relay Output (AL1, AL2) Function Selection (C026), to
07 (OTQ: Overtorque/Undertorque signal).
•
The overtorque/undertorque function regards the torque level equivalent to the rated output current of
the inverter as 100%.
To convert it to the rated motor torque ratio, use the following formula:
Rated motor torque ratio = [Overtorque/Undertorque level set value] [Rated output current of
Inverter] / [Rated motor current]
•
Use this function to detect the brake release signal of an elevator, or if the load applied to the load
machine is abnormally high.
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