Setting 2: oL3, oL4 at run (Alarm)
Overtorque detection works as long as the Run command is active. The operation continues after detecting overtorque and
triggering an oL3/oL4 alarm.
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 stops and triggers an oL3/ oL4 fault.
Setting 4: oL3, oL4 at run (Fault)
Overtorque detection works as long as a Run command is active. The operation stops and triggers an oL3/ oL4 fault.
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 detecting overtorque and triggering an oL3/oL4 alarm.
Setting 6: UL3, UL4 at Run (Alarm)
Undertorque detection works as long as the Run command is active. The operation continues after detecting overtorque and
triggering an oL3/oL4 alarm.
Setting 7: UL3, UL4 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 stops and triggers an oL3/ oL4 fault.
Setting 8: UL3, UL4 at run (Fault)
Undertorque detection works as long as a Run command is active. The operation stops and triggers an oL3/ oL4 fault.
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L6-02, L6-05: Torque Detection Level 1, 2
These parameters set the detection levels for torque detection functions 1 and 2. In V/f and OLV/PM control modes, these
levels are set as a percentage of the drive rated output current. In vector control modes, these levels are set as a percentage of
the motor rated torque.
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:
The torque detection level 1 (L6-02) can also be supplied by an analog input terminal set to H3-oo = 7. Here, the analog value has priority
and the setting in L6-02 is disregarded. Torque detection level 2 (L6-05) cannot be set by an analog input.
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L6-03, L6-06: Torque Detection Time 1, 2
These parameters determine the time required to trigger an alarm or fault after exceeding the levels in L6-02 and L6-05.
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 detects the mechanical weakening of a machine that leads to overtorque or undertorque situations after a set
machine operation time has elapsed.
The function is activated in the drive when the cumulative operation counter U4-01 exceeds the time set to parameter L6-11.
Mechanical Weakening Detection uses the torque detection 1 settings (L6-01, L6-02, L6-03) and triggers an oL5 fault when
overtorque or undertorque occurs in the speed range determined by parameter L6-08 and L6-09. The oL5 operation is set by
parameter L6-08.
Set H2-oo to 22 to output a signal for Mechanical Weakening Detection.
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L6-08: Mechanical Weakening Detection Operation
Sets the speed range to detect mechanical weakening and the action to take when mechanical weakening is detected.
No. Name Setting Range Default
L6-08 Mechanical Weakening Detection Operation 0 to 8 0
5.8 L: Protection Functions
260
YASKAWA ELECTRIC SIEP C710616 31B YASKAWA AC Drive – A1000 Technical Manual
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