5.8 L: Protection Functions
314
YASKAWA ELECTRIC
SIEP C710636 02B YASKAWA U1000 Technical Manual
Figure 5.101
Figure 5.101 Torque Limit Parameters and Analog Input Settings
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L7-01 to L7-04: Torque Limits
These parameters set the torque limits in each quadrant.
Note:
If the multi-function analog input is programmed for “10: Forward torque limit”, “11: Reverse torque limit”, “12: Regenerative
torque limit”, or “15: General torque limit”, the drive uses the lower value in L7-01 through L7-04, or analog input torque limit.
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L7-06: Torque Limit Integral Time Constant
Sets the integral time constant for the torque limit function. Decrease this setting for faster torque limit response. Increase
it if oscillation occur when operating at the torque limit.
■
L7-07: Torque Limit Control Method Selection during Accel/Decel
Selects the function of torque limit during acceleration and deceleration.
Setting 0: Proportional control
The torque limit function works with P control during accel and decel, and switches to I control at constant speed. Use
this setting when accelerating or decelerating to the desired speed has priority over the torque limit during speed changes.
Setting 1: Integral control
The torque limit function always uses I control. Use this setting when a highly accurate torque limit is required, even
during speed changes. Using this function may increase the acceleration time, or may prevent the motor speed from
reaching the frequency reference if the torque limit is reached first.
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L7-16: Torque Limit Process at Start
Assigns a time filter to allow the torque limit to build at start.
Setting 0: Disabled
Toque limit is created at start without a delay time. Disable L7-16 to maximize response time when the application
requires sudden acceleration or deceleration at start.
No.
Name
Setting Range
Default
L7-01
Forward Torque Limit
0 to 300%
200%
L7-02
Reverse Torque Limit
0 to 300%
200%
L7-03
Forward Regenerative Torque Limit
0 to 300%
200%
L7-04
Reverse Regenerative Torque Limit
0 to 300%
200%
No.
Name
Setting Range
Default
L7-06
Torque Limit Integral Time Constant
5 to 10000 ms
200 ms
No.
Name
Setting Range
Default
L7-07
Torque Limit Control Method Selection during Accel/Decel
0 or 1
0
No.
Name
Setting Range
Default
L7-16
Torque Limit Process at Start
0 or 1
1
positive torque reference
negative torque reference
10: Forward Torque Limit
12: Regenerative Torque Limit
15: General Torque Limit
Parameter L7-04
REV motor rotation
11: Reverse Torque Limit
15: General Torque Limit
Parameter L7-02
10: Forward Torque Limit
15: General Torque Limit
Parameter L7-01
FWD motor rotation
11: Reverse Torque Limit
12: Regenerative Torque Limit
15: General Torque Limit
Parameter L7-03
quadrant 2
quadrant 3
quadrant 1
quadrant 4
REV run regenerative
REV run motoring
FWD run motoring
FWD run regenerative
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