YASKAWA LA500 - Page 338

12.7 L: Protection Functions
338 YASKAWA SIEPYEULA5001C LA500 Technical Manual
Note:
• When L7-01 to L7-04 and analog inputs or communication option torque limits set torque limits for the same quadrant, the drive
enables the lowest value.
In this example of parameter settings, the torque limit for quadrant 1 is 130% and the torque limit for quadrants 2, 3, and 4 is 150%.
Settings: L7-01 = 130%, L7-02 to L7-04 = 200%
• The drive output current limits maximum output torque. The torque limit is 150% of the rated output current for HD and to 120% of
the rated output current for ND. The actual output torque is not more than the limits of the drive rated output current when you set the
torque limit to a high value.
■ L7-01: Forward Torque Limit
Note:
• 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.
■ L7-02: Reverse Torque Limit
Note:
• 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.
■ L7-03: Forward Regenerative Trq Limit
Note:
• 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.
■ L7-04: Reverse Regenerative Trq Limit
Note:
• 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)
Expert
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)
Expert
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.
V/f
OLV
V/f
OLV