YASKAWA A1000 Series Technical Manual page 268

5.8 L: Protection Functions
Example: If parameter L7-01 = 130%, L7-02 to L7-04 = 200%, and a general torque limit of 150% is set by an analog
input (H2-02, H2-06, H2-10 = 15), then the torque limit in quadrant 1 will be 130%, but 150% in all other quadrants.
Figure 5.103
REV motor rotation
L7-01 to L7-04: Torque Limits
■
These parameters set the torque limits in each operation mode.
No.
L7-01
L7-02
L7-03
L7-04
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.
■ 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.
No.
L7-06
L7-07: Torque Limit Control Method Selection during Accel/Decel
■
Selects the function of torque limit during acceleration and deceleration.
No.
L7-07
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.
L7-16: Torque Limit Process at Start
■
Assigns a time filter to allow the torque limit to build at start.
No.
L7-16
268
positive torque reference
REV run regenerative
10: Positive Torque Limit
12: Regenerative Torque Limit
15: Torque Limit
Parameter L7-04
quadrant 2
quadrant 3
11: Negative Torque Limit
15: Torque Limit
Parameter L7-03
REV run motoring
negative torque reference
Figure 5.103 Torque Limit Parameters and Analog Input Settings
Name
Forward Torque Limit
Reverse Torque Limit
Forward Regenerative Torque Limit
Reverse Regenerative Torque Limit
Name
Torque Limit Integral Time Constant
Name
Torque Limit Control Method Selection during Accel/Decel
Name
Torque Limit Process at Start
FWD run motoring
10: Positive Torque Limit
15: Torque Limit
Parameter L7-01
quadrant 1
quadrant 4
11: Negative Torque Limit
12: Regenerative Torque Limit
15: Torque Limit
Parameter L7-02
FWD run regenerative
YASKAWA ELECTRIC SIEP C710616 27C YASKAWA AC Drive A1000 Technical Manual
FWD motor rotation
common_TMonly
Setting Range
0 to 300%
0 to 300%
0 to 300%
0 to 300%
Setting Range
5 to 10000 ms
Setting Range
0 or 1
Setting Range
0 to 1
Default
200%
200%
200%
200%
Default
200 ms
Default
0
Default
1