Machine Protection
6-49
Multi-function Digital Outputs (H2-01 to H2-05)
L6-01 and L6-04 Set Values and LCD Indicator Lights
The relationship between alarms displayed by the digital operator when overtorque or undertorque is detected
and the set values in L6-01 and L6-04 is shown in the following table.
Setting Example
The following diagram shows the time chart for overtorque and undertorque detection.
• Overtorque Detection
Set
Value
Function
Control Methods
V/f
Open
Loop
Vector
Flux
Vector
B Overtorque/undertorque detection 1 N.O. (N.O. contact: Overtorque/undertorque detection when on) Yes Yes Yes
17
Overtorque/undertorque detection 1 N.
C
. (N.C. Contact: Overtorque/undertorque detection when off)
Yes Yes Ye s
18
Overtorque/undertorque detection 2 N.
O
. (N.O. Contact: Overtorque/undertorque detection when on)
Yes Yes Ye s
19
Overtorque/undertorque detection 2 N.C. (N.C. Contact: Overtorque/undertorque detection when off)
Yes Yes Ye s
Set
Value
Function
LCD Indications
Overtorque/
Undertorque
Detection 1
Overtorque/
Undertorque
Detection 2
0 Overtorque/undertorque detection disabled. - -
1
Overtorque detection only with speed matching: Operation continues after
overtorque (warning).
OL3 flashes OL4 flashes
2
Overtorque detected continuously during run: Operation continues after
overtorque (warning).
OL3 flashes OL4 flashes
3
Overtorque detection only with speed matching: Output stopped upon detec-
tion (protected operation).
OL3 lit OL4 lit
4
Overtorque detected continuously during run: Output stopped upon detec-
tion (protected operation).
OL3 lit OL4 lit
5
Undertorque detection only with speed matching: Operation continues after
overtorque (warning).
UL3 flashes UL4 flashes
6
Undertorque detected continuously during run: Operation continues after
overtorque (warning).
UL3 flashes UL4 flashes
7
Undertorque detection only with speed matching: Output stopped upon
detection (protected operation).
UL3 lit UL4 lit
8
Undertorque detected continuously during run: Output stopped upon detec-
tion (protected operation).
UL3 lit UL4 lit
*
*
L6-02 or L6-05
L6-03 or
L6-06
L6-03 or
L6-06
Overtorque detection 1 NO
or overtorque detection 2 NO
on on
* Overtorque detection disabled bandwidth is approximately 10% of the MxC rated output
current (or motor rated torque).
Motor current (output torque)
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