Parameter Details
12
12.7 L: Protection Functions
YASKAWA SIEPYEULA5001C LA500 Technical Manual 335
■ Undertorque Detection Time Chart
When you use Overtorque/Undertorque Detection 1, the drive detects undertorque if the motor current or motor
torque is less than or equal to the detection level set in L6-02 for the time set in L6-03. Parameter L6-01 sets the
operation after detection.
When you use Overtorque/Undertorque Detection 2, set the operation in L6-04, L6-05, and L6-06.
Set the terminal that outputs an alarm in H2-01 to H2-03.
Figure 12.32 Undertorque Detection Time Chart
Note:
The drive applies a hysteresis of approximately 10% of the drive rated output current or the motor rated torque to the overtorque/
undertorque detection function.
■ L6-01: Torque Detection Selection 1
No.
(Hex.)
Name Description
Default
(Range)
L6-01
(04A1)
Torque Detection Selection
1
Sets torque detection conditions that will trigger an overtorque or undertorque response from the
drive.
0
(0 - 8)
The drive detects overtorque if the motor current or output torque is more than the level set in L6-02 [Torque
Detection Level 1] for the length of time set in L6-03 [Torque Detection Time 1]. The drive detects undertorque if
the motor current or output torque is less than the level set in L6-02 for the length the time set in L6-03.
0 : Disabled
The drive will not detect overtorque or undertorque.
1 : oL @ Speed Agree - Alarm only
The drive detects overtorque when the output frequency aligns with the frequency reference. Detection does not
occur during acceleration/deceleration. The drive outputs an oL3 [Overtorque Detection 1] and operation
continues.
2 : oL @ RUN - Alarm only
When the Run command is enabled, the drive constantly detects overtorque. The drive outputs an oL3 and
operation continues.
3 : oL @ Speed Agree - Fault
The drive detects overtorque when the output frequency aligns with the frequency reference. Detection does not
occur during acceleration/deceleration. The drive outputs an oL3 and operation stops.
4 : oL @ RUN - Fault
When the Run command is enabled, the drive constantly detects overtorque. The drive outputs an oL3 and
operation stops.
5 : UL @ Speed Agree - Alarm only
The drive detects undertorque when the output frequency aligns with the frequency reference. Detection does not
occur during acceleration/deceleration. The drive outputs a UL3 [Undertorque Detection 1] and operation
continues.
6 : UL @ RUN - Alarm only
When the Run command is enabled, the drive constantly detects undertorque. The drive outputs a UL3 and
operation continues.
7 : UL @ Speed Agree - Fault
The drive detects undertorque when the output frequency aligns with the frequency reference. Detection does not
occur during acceleration/deceleration. The drive outputs a UL3 and operation stops.
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