12.9 L: Protection Functions
728 YASKAWA SIEPC71061753C GA500 Technical Manual
Note:
• The lower torque limit is enabled when you set the torque limit by the following method.
–Set H3-02 or H3-10 = 10, 15 [MFAI Function Select = Forward, Reverse/Regenerative Torque Limit].
–Use a communication option to set the torque limits
• You must think about drive capacity when a large quantity of torque is necessary. If you set the value too high, the drive can detect oC
[Overcurrent].
• If you set the value too low with large loads, the motor can stall.
■ L7-04: Reverse Regenerative Trq Limit
No.
(Hex.)
Name Description
Default
(Range)
L7-04
(04AA)
RUN
Reverse Regenerative Trq
Limit
Sets the torque limit value for reversed regenerative conditions as a percentage of the motor rated
torque.
200%
(0 - 300%)
Note:
• Use this method to set the torque limit and enable the lower torque limit:
–Set H3-02 or H3-10 = 10, 15 [MFAI Function Select = Forward, Reverse/Regenerative Torque Limit].
–Use a communication option to set the torque limits
• You must think about drive capacity when a large quantity of torque is necessary. If you set the value too high, the drive can detect oC
[Overcurrent].
• If you set the value too low with large loads, the motor can stall.
■ L7-06: Torque Limit Integral Time
No.
(Hex.)
Name Description
Default
(Range)
L7-06
(04AC)
Torque Limit Integral Time
Sets the integral time constant for the torque limit function.
200 ms
(5 - 10000 ms)
Decrease the setting value to increase torque limit responsiveness when you use torque limits and L7-07 = 1
[Torque Limit during Accel/Decel = Proportional & Integral control].
If there is hunting when torque limits are active, increase the setting value.
■ L7-07: Torque Limit during Accel/Decel
No.
(Hex.)
Name Description
Default
(Range)
L7-07
(04C9)
Torque Limit during Accel/
Decel
Sets the torque limit function during acceleration and deceleration.
0
(0, 1)
0 : Proportional only
The torque limit function works with proportional control during acceleration and deceleration, and switches to
integral control at constant speed. Use this setting when quickly reaching the target speed is more important than
the torque limit during speed changes.
1 : Proportional & Integral control
The torque limit function always uses integral control. Use this setting when a very accurate torque limit is
necessary during speed changes, for example in winding machine applications.
If you make the torque limit the most important, it can:
• Increase the acceleration and deceleration times.
• Not let the motor speed reach the frequency reference value during run at constant speed.
■ L7-16: Torque Limit Process at Start
No.
(Hex.)
Name Description
Default
(Range)
L7-16
(044D)
Torque Limit Process at
Start
Assigns a time filter to allow the torque limit to build at start.
1
(0, 1)
0 : Disabled
There is torque limit at start without a delay time.
Use this setting to maximize the response time when sudden acceleration or deceleration at start is necessary.
1 : Enabled
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