12.9 L: Protection Functions
726 YASKAWA SIEPC71061753C GA500 Technical Manual
When the speed (signed) ≤ L6-09, the drive detects mechanical weakening. The drive will detect UL5 and stop
operation.
8 : UL5 @ |Speed| < 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 where the drive will operate the mechanical deterioration detection function,
as a percentage of the Maximum Output Frequency.
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 and keeps the torque from the motor
constant. This function limits the torque applied to loads and regenerative torque to a value 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 110% 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:
• Individually set the four torque limit quadrants using L7-01 to L7-04 [Torque Limit].
• Use MFAI to individually set the four torque limit quadrants. Set H3-02, H3-10 = 10, 11, 12 [MFAI Function
Select = Forward Torque Limit, Reverse Torque Limit, Regenerative Torque Limit].
• Use MFAI to set all four torque limit quadrants together. Set H3-02, H3-10 = 15 [General Torque Limit].
• Use a communication option to set all four torque limit quadrants together.
Figure 12.130 shows the configuration method for each quadrant.
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