Machine Protection
6-31
Detecting Motor Torque
If an excessive load is applied to the machinery (overtorque) or the load suddenly drops (undertorque), you
can output an alarm signal to one of the multi-function output terminal M1-M2 or M3-M4.
To use the overtorque/undertorque detection function, set B or 17 (overtorque/undertorque detection NO/NC)
in one of the constant H2-01 and H2-02 (multi-function output terminals M1-M2 and M3-M4 function selec-
tion).
The overtorque/undertorque detection level is the current level taking the inverter rated output current as
100%.
Related Constants
Multi-function Output (H2-01 and H2-02)
L6-01 Set Value and Operator Display
The relationship between alarms displayed on the Digital Operator when overtorque or undertorque is
detected and the setting in L6-01 is shown in the following table.
Con-
stant
Number
Name Description
Setting
Range
Factory
Setting
Change
during
Opera-
tion
Access
Level
L6-01 Torque detection selection 1
0: Overtorque/undertorque detection disabled.
1: Overtorque detection only with speed agreement; oper-
ation continues after overtorque (warning is output).
2: Overtorque detected continuously during operation;
operation continues (warning is output).
3: Overtorque detection only with speed agreement; out-
put is stopped upon detection.
4: Overtorque detected continuously during operation;
output is stopped upon detection.
5: Undertorque detection only with speed agreement;
operation continues (warning is output).
6: Undertorque detected continuously during operation;
operation continues (warning is output).
7: Undertorque detection only with speed agreement; out-
put is stopped upon detection.
8: Undertorque detected continuously during operation;
output is stopped upon detection.
0 to 8 6 No A
L6-02 Torque detection level 1 Inverter rated current is set as 100%. 0 to 300 150% No A
L6-03 Torque detection time 1 Set the overtorque/undertorque detection time.
0.0 to
10.0
10.0 s No A
Set
Value
Function
B
Overtorque/undertorque detection 1 NO
(NO contact: Overtorque detection and undertorque detection enabled when contact is ON)
17
Overtorque/undertorque detection 1 NC
(NC contact: Overtorque detection and undertorque detection enabled when contact is OFF)
Set
Value
Function
Operator
Overtorque/ Under-
torque Detection 1
0 Overtorque/undertorque detection disabled. –
1
Overtorque detection only with speed agree; operation continues (warning is
output).
OL3 flashes
2
Overtorque detected continuously during operation; operation continues
(warning is output).
OL3 flashes
3
Overtorque detection only with speed agree; output is stopped upon detec-
tion.
OL3 lights up
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