6
-28
Detecting Motor Torque
If an excessive load is placed on the machinery (overtorque) or the load is suddenly lightened (undertorque),
you can output an alarm signal to multi-function output terminal DO1 to DO8.
To use the overtorque/undertorque detection function, set B, 17, 18, 19 (overtorque/undertorque detection NO/
NC) in one of the following constants: H2-01 to H2-08 (multi-function output terminals DO1 to DO8 function
selection).
The overtorque/undertorque detection level is the motor torque (motor rated torque 100%) in vector control.
Related Constants
Constant
Number
Name
Description
Setting
Range
Factory
Setting
Change
during
Operation
Control
Methods
MEMOBUS
Register
Open-
loop
Vector
Flux
Vector
Display
L6-01
Overtorque/
Undertorque detection
selection 1
0: Overtorque/undertorque
detection disabled.
1: Overtorque detection only
with speed agreement;
operation continues after
overtorque (warning).
2: Overtorque detected
continuously during
operation; operation
continues after overtorque
(warning).
3: Overtorque detection only
with speed agreement;
output stopped upon
detection (protected
operation).
4: Overtorque detected
continuously during
operation; output stopped
upon detection (protected
operation).
5: Undertorque detection only
with speed agreement;
operation continues after
overtorque (warning).
6: Undertorque detected
continuously during
operation; operation
continues after overtorque
(warning).
7: Undertorque detection only
with speed agreement;
output stopped upon
detection (protected
operation).
8: Undertorque detected
continuously during
operation; output stopped
upon detection (protected
operation).
0 to 8
0
No
A
A
550H
Torq Det 1 Sel
L6-02
Overtorque/
Undertorque detection
level 1
Open-loop vector control:
Motor rated torque is set as
100%.
0 to
300
150%
No
A
A
551H
Torq Det 1 Lvl
