Setting 1: oL3/oL4 at Speed Agree - Alarm
Overtorque detection is active only when the output speed is equal to the frequency reference, i.e., no detection during
acceleration and deceleration. The operation continues after detection and an oL3/oL4 alarm is triggered.
Setting 2: oL3/oL4 at Run - Alarm
Overtorque detection works whenever a Run command is
active. The operation continues after detection and an oL3/oL4
alarm is triggered.
Setting 3: oL3/oL4 at Speed Agree - Fault
Overtorque detection is active only when the output speed is equal to the frequency reference, i.e., no detection during
acceleration and deceleration. The operation is stopped and an oL3/oL4 fault is triggered.
Setting 4: oL3/oL4 at Run - Fault
Overtorque detection works whenever a Run command is active. The operation is stopped and an oL3/oL4 fault is triggered.
Setting 5: UL3/UL4 at Speed Agree - Alarm
Undertorque detection is active only when the output speed is equal to the frequency reference, i.e., no detection during
acceleration and deceleration. The operation continues after detection and a UL3/UL4 alarm is triggered.
Setting 6: oL5/UL5 at Run - Alarm
Undertorque detection works whenever a Run command is active. The operation continues after detection and an oL5/
UL5 alarm is triggered.
Setting 7: UL5 at Speed Agree - Fault
Undertorque detection is active only when the output speed is equal to the frequency reference, i.e., no detection during
acceleration and deceleration. The operation is stopped and a UL5 fault is triggered.
Setting 8: oL3/oL4 at Run - Fault
Undertorque detection works whenever a Run command is active. The operation is stopped and an oL3/oL4 fault is
triggered.
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L6-02/L6-05: Torque Detection Level 1/2
These parameters the detection levels for the torque detection functions 1 and 2.
No. Name Setting Range Default
L6-02 Torque Detection Level 1 0 to 300% 150%
L6-05 Torque Detection Level 2 0 to 300% 150%
Note: 1. The torque detection level 1 (L6-02) can also be supplied by an analog input set to H3-02/10 = 7. In this case the analog value has
priority and the setting L6-02 is disregarded. Torque detection level 2 (L6-05) can not be set by an analog input.
2. The detection levels for overtorque and undertorque are set as a percentage of the drive rated current when using V/f Control or
Open Loop Vector Control. When using Closed Loop Vector Control, the drive sets torque detection as a percentage of the motor
rated current.
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L6-03/L6-06: Torque Detection Time 1/2
These parameters set the time that the levels set in L6-02/05 have to be exceeded before an alarm/fault is triggered.
No. Name Setting Range Default
L6-03 Torque Detection Time 1 0.0 to 10.0 s 0.1 s
L6-06 Torque Detection Time 2 0.0 to 10.0 s 0.1 s
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Mechanical Weakening Detection
This
function can be used to detect mechanical
weakening of a machine that leads to overtorque or undertorque situations
after a certain machine operation time has elapsed.
The function is activated in the drive when the cumulative operation counter U4-01 exceeds the time set in parameter
L6-11. Mechanical weakening detection uses the torque detection 1 settings (L6-01/02/03) and triggers an oL5 fault when
overtorque or undertorque occurs in the speed range determined by parameter L6-08/09. The oL5 operation is set by
parameter L6-08.
To output a signal for mechanical weakening detection, set H2-01, H2-02, or H2-03 to 22.
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L6-08: Mechanical Weakening Detection Operation
Decides which speed range the function is active and sets the mechanical weakening detection operation.
No. Name Setting Range Default
L6-08 Mechanical Weakening Detection 0 to 8 0
5.8 L: Protection Functions
222
YASKAWA ELECTRIC SIEP C710606 16C YASKAWA AC Drive – V1000 Technical Manual
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