User`s manual

6-46
6
 Motor Torque Detection
If an excessive load is applied to the machinery (overtorque) or the load drops suddenly (undertorque), an
alarm signal can be output to one of the digital output terminals M1-M2, M3-M4, or M5-M6.
To use the overtorque/undertorque detection function, set B, 17, 18, 19 (overtorque/undertorque detection
NO/NC) in one of the parameter H2-01 to H2-03 (digital output terminals M1-M2, M3-M4, and M5-M6 func-
tion selection).
Overtorque/undertorque is detected by:
• observing the output current in V/f control with or without PG (the inverter rated output current is equal to
100%).
• observing the torque reference value in Open Loop and Closed Loop Vector control (the motor rated
torque is equal to 100%).
Related Parameters
Multi-function Output (H2-01 to H2-03)
Multi-Function Analog Input (H3-09)
Parameter
No.
Name
Factory
Setting
Change
during
Opera-
tion
Control Methods
V/f
V/f with
PG
Open
Loop
Vector
Closed
Loop
Vector
L6-01Torque detection selection 1 0 No AAAA
L6-02Torque detection level 1 150%No AAAA
L6-03Torque detection time 1 0.1 s No AAAA
L6-04Torque detection selection 2 0 No AAAA
L6-05Torque detection level 2 150%No AAAA
L6-06Torque detection time 2 0.1 s No AAAA
Set
Value
Function
Control Methods
V/f
V/f
with
PG
Open
Loop
Vector
Closed
Loop
Vector
B
Overtorque/undertorque detection 1 NO
(NO contact: Overtorque detection and undertorque detection enabled when contact is ON)
YesYesYesYes
17
Overtorque/undertorque detection 1 NC
(NC contact: Overtorque detection and undertorque detection enabled when contact is OFF)
YesYesYesYes
18
Overtorque/undertorque detection 2 NO
(NO contact: Overtorque detection and undertorque detection enabled when contact is ON)
YesYesYesYes
19
Overtorque/undertorque detection 2 NC
(NC contact: Overtorque detection and undertorque detection enabled when contact is OFF)
YesYesYesYes
Set
Value
Function 100% of Contents
Control Methods
V/f
V/f
with
PG
Open
Loop
Vector
Closed
Loop
Vector
7 Overtorque/Undertorque Detection Level
Motor rated torque (vector control), Inverter rated
current (V/f control)
Yes Yes Yes Yes