5.8 L: Protection Functions
338 YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
L6-02: Torque Detection Level 1
L6-03: Torque Detection Time 1
L6-05: Torque Detection Level 2
L6-06: Torque Detection Time 2
Figure 5.85 Time Chart for Undertorque Detection
Note:
The drive applies a hysteresis of approximately 10% of the drive rated output current or the motor rated torque to the overtorque/
undertorque/underload detection function.
Underload Detection Time Chart
When L6-01 = 9 [UL6 @ Speed Agree - Alarm only] to 12 [UL6 @ RUN - Fault], the drive will detect underload if
the motor current or output torque is less than or equal to the detection level for the time set in L6-03.
Note:
The linear curve of L6-02, L6-13 [Motor Underload Curve Select], and L6-14 [Motor Underload Level @ Min Freq] sets the underload
detection level.
Use H2-01 to H2-03 [MFDO Function Selection] to set the terminal that outputs the alarm.
H2-xx = 58: UL6 Underload Detected
L6-03: Torque Detection Time 1
L6-14: Motor Underload Level @ Min Freq
Figure 5.86 Time Chart for Underload Detection at Minimum Frequency
Note:
The drive applies a hysteresis of approximately 10% of the drive rated output current or the motor rated torque to the overtorque/
undertorque/underload detection function.
■ L6-01: Torque Detection Selection 1
No.
(Hex.)
Name Description
Default
(Range)
L6-01
(04A1)
Torque Detection Selection 1 Sets the speed range that detects overtorque and undertorque and the operation of drives (operation
status) after detection.
0
(0 - 12)
• The drive detects oL [overtorque] if the motor current or output torque is more than the level set in L6-02 [Torque
Detection Level 1] for the time set in L6-03 [Torque Detection Time 1].
• The drive detects UL [undertorque] if the motor current or output torque is less than the level set in L6-02 for the
time set in L6-03.
• The drive detects UL6 [Underload or Belt Break Detected] if the motor current or output torque is less than the
linear curve set in L6-02 and L6-14 [Motor Underload Level @ Min Freq].
0 : Disabled
The drive will not detect overtorque or undertorque.
1 : oL @ Speed Agree - Alarm only
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