Mitsubishi Electric FR-A820-00046 Instruction Manual page 300

Speed control under Real sensorless vector control, vector control, PM sensorless vector control
Setting the torque limit values during acceleration/deceleration individually (Pr. 816, Pr. 817)
● The torque limit during acceleration and deceleration can be set individually.
Torque limit using the setting values of Pr. 816 "Torque limit level during acceleration" and Pr. 17
"Torque limit level during deceleration" is shown below.
● If 1 s elapses while the difference between the set speed and rotation speed is within ±2 Hz, the
torque limit level during acceleration/deceleration (Pr. 816 or Pr. 817) changes to the torque
control level during constant speed (Pr. 22).
● When the difference between the set speed and rotation speed is –2 Hz or less, the torque limit
level during deceleration (Pr. 817) activates.
Output
frequency
frequency
Torque
limit level
Pr. 816
Pr. 817
Fig. 5-20:
NOTE The Pr. 816 and Pr. 817 settings are invalid under position control.
5 - 98
(Hz)
Set
Acceleration
Torque limit level
during acceleration
Individual torque limit value during acceleration and deceleration
–2 Hz < set speed – rotation speed < 2 Hz
Constant speed
1 s
Torque limit set to Pr. 810
Parameters
–2 Hz set speed – rotation speed
Time
Deceleration
Torque limit level
during deceleration
I002510E