Detecting Motor Torque - YASKAWA Varispeed E7 Instruction Manual And Parameter Description

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
Con-
stant Name
Number
L6-01 Torque detection selection 1
L6-02 Torque detection level 1
L6-03 Torque detection time 1
Multi-function Output (H2-01 and H2-02)
Set
Value
Overtorque/undertorque detection 1 NO
B
(NO contact: Overtorque detection and undertorque detection enabled when contact is ON)
Overtorque/undertorque detection 1 NC
17
(NC contact: Overtorque detection and undertorque detection enabled when contact is OFF)
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.
Set
Value
0 Overtorque/undertorque detection disabled.
Overtorque detection only with speed agree; operation continues (warning is
1
output).
Overtorque detected continuously during operation; operation continues
2
(warning is output).
Overtorque detection only with speed agree; output is stopped upon detec-
3
tion.
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Description
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.
Inverter rated current is set as 100%.
Set the overtorque/undertorque detection time.
Function
Function
Machine Protection
Change
Setting Factory during Access
Range Setting Opera- Level
tion
0 to 8 6 No A
0 to 300 150% No A
0.0 to
10.0 s No A
10.0
Operator
Overtorque/ Under-
torque Detection 1
–
OL3 flashes
OL3 flashes
OL3 lights up
31
6-