Machine Protection
6-55
îš„L6-01 and L6-04 Set Values and LCD Indications
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.
îš„Setting Example
The following diagram shows the time chart for overtorque and undertorque detection.
• Overtorque Detection
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 operation; 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 operation; output stopped upon
detection (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 operation; 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 operation; output stopped upon
detection (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 band is approximately 10% of the Inverter rated output
current (or motor rated torque).
Motor current (output torque)
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