Parameter Details
12
12.9 L: Protection Functions
YASKAWA SIEPC71061737D GA800 Drive Technical Reference 997
Note:
• Use this method to set the torque limit and enable the lower torque limit:
–Set H3-02, H3-06, 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
There is a delay time of 64 ms at start to build the torque limit.
■ L7-35: Low Freq Regen Torque Limit Lvl
No.
(Hex.)
Name Description
Default
(Range)
L7-35
(1B57)
Expert
Low Freq Regen Torque
Limit Lvl
Sets the torque limit used during low-speed regeneration. Usually it is not necessary to change this
setting.
50.0%
(0.0 - 200.0%)
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