12.9 L: Protection Functions
908 YASKAWA SIEPC71061705H GA700 Series Technical Manual
■ 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%)
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.
To Next Page
Loading...
