11.9 L: Protection Functions
974 YASKAWA ELECTRIC SIEP C710617 05F YASKAWA AC Drive GA700 Technical Manual
6 : UL5 @ lSpeedl < L6-09 - Alarm
When the speed (absolute value) ≤ L6-09, the drive detects mechanical weakening. The drive will detect UL5 and
continue operation.
7 : UL5 @ Speed < L6-09 - Fault
When the speed (signed) ≤ L6-09, the drive detects mechanical weakening. The drive will detect UL5 and stop
operation.
8 : UL5 @ lSpeedl < L6-09 - Fault
When the speed (absolute value) ≤ L6-09, the drive detects mechanical weakening. The drive will detect UL5 and
stop operation.
■ L6-09: Mech Fatigue Detect Speed Level
No.
(Hex.)
Name Description
Default
(Range)
L6-09
(0469)
Mech Fatigue Detect
Speed Level
Sets the speed level as a percentage where the drive will operate the
mechanical deterioration detection function, with E1-04 [Maximum Output
Frequency] is the 100% value.
110.0%
(-110.0 - +110.0%)
Parameters L6-01 to L6-03 [Torque Detection 1 Settings Parameters] set the overtorque/undertorque detection
conditions.
When L6-08 = 2, 4, 6, 8 [Mechanical Fatigue Detect Select = Speed : unsigned], the setting value of L6-09 is the
absolute value. When L6-09 is set to a negative number, the drive processes this value as a positive number.
■ L6-10: Mech Fatigue Detect Delay Time
No.
(Hex.)
Name Description
Default
(Range)
L6-10
(046A)
Mech Fatigue Detect
Delay Time
Sets the time for mechanical deterioration detection.
0.1 s
(0.0 - 10.0 s)
When the detection conditions set in L6-08 [Mechanical Weakening Detect Ope] continue for the time set in L6-
10, the drive will detect mechanical weakening.
■ L6-11: Mech Fatigue Hold Off Time
No.
(Hex.)
Name Description
Default
(Range)
L6-11
(046B)
Mech Fatigue Hold
Off Time
Sets the time that the drive will start mechanical deterioration detection
triggered by the cumulative operation time of the drive.
0 h
(0 - 65535 h)
When the total operation time of the drive is more than the value set in L6-11, the drive will detect mechanical
weakening. Use U4-01 [Cumulative Ope Time] to monitor the drive total operation time.
◆ L7: Torque Limit
The torque limit function limits the internal torque reference for the drive to limit the quantity of torque generated
by the motor to a constant quantity This function keeps the torque applied to loads and regenerative torque less
than a set quantity. This function also prevents damage to machinery and increases the reliability of continuous
operation. You can set torque limits individually for the four quadrants, which include torque direction (motoring/
regeneration) and direction of motor rotation (forward/reverse). When the torque reference value is at the set
torque limit, the MFDO terminal set for During Torque Limit [H2-xx = 30] activates.
Note:
• The drive output current limits maximum output torque. The drive limits torque to 150% of the rated output current for Heavy Duty
Rating (HD) and to 120% of the rated output current for Normal Duty Rating (ND). The actual output torque is not more than the limits
of the drive rated output current when you set the torque limit to a high value.
• When you use torque limits for lifting applications, do not lower the torque limit value too much. When the torque limit function is
triggered, falls and rollbacks can occur because of sudden acceleration stops and stalls of the motor.
■ Configuring Settings
Use one of these methods to set torque limits:
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