YASKAWA GA800 Programming Manual page 474

2.9 L: Protection Functions
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.
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L7-07: Torque Limit during Accel/Decel
No.
Name
(Hex.)
L7-07 Torque Limit during Accel/
Decel
(04C9)
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.
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L7-16: Torque Limit Process at Start
No.
Name
(Hex.)
L7-16 Torque Limit Process at Start
(044D)
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.
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L7-35: Low Freq Regen Torque Limit Lvl
No.
Name
(Hex.)
L7-35 Low Freq Regen Torque
Limit Lvl
(1B57)
Expert
Reduces the regenerative torque limit to the level set with L7-35 when using low frequencies such that the output
frequency is less than L7-36 [Regen Torque Limit Derate Freq]. The drive does not decrease torque limits during
ramp to stop operation. Decrease the setting of L7-35 when oC [Overcurrent] issues occur while a regenerative load
is input and the speed reference is constant.
Note:
• Reduce the setting value of L7-35 in increments of 10.0% and reduce the setting value of L7-36 in increments of 2.0 Hz when faults occur
during regenerative loads at low speed.
• Setting values that are too high can cause faults.
• The torque limit reduction function does not operate when L7-35 is set with a value larger than L7-03 [Forward Regenerative Trq Limit] or
L7-04 [Reverse Regenerative Trq Limit].
• The motor may rotate slightly faster than the reference when a regenerative load is input at low speeds while L7-35 is set to a low value.
474
V/f CL-V/f OLV CLV AOLV
Sets the torque limit function during acceleration and deceleration.
V/f CL-V/f OLV CLV AOLV
Assigns a time filter to allow the torque limit to build at start.
V/f CL-V/f OLV CLV AOLV
Sets the torque limit used during low-speed regeneration. Usually it is not necessary to change this
setting.
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
Description
OLV/PM AOLV/PM CLV/PM EZOLV OLV/PM
YASKAWA TOEPYAIGA8002B GA800 Drive Programming
Default
(Range)
0
(0, 1)
Default
(Range)
1
(0, 1)
Default
(Range)
50.0%
(0.0 - 200.0%)