Mitsubishi Electric FR-A800 Series Instruction Manual page 252

NOTE
• Changing the terminal assignment using Pr.178 to Pr.189 (Input terminal function selection) may affect the other functions.
Set parameters after confirming the function of each terminal.
 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.817 Torque limit level during deceleration is as follows.
• If 1 second 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
Torque limit level during deceleration (Pr.817) activates.
NOTE
• The Pr.816 and Pr.817 settings are invalid under position control.
 Changing the setting increments of the torque limit level (Pr.811)
• The setting increments of Pr.22 Torque limit level, Pr.801 Output limit level, and Pr.812 to Pr.817 Torque limit level
can be changed to 0.01% by setting Pr.811 Set resolution switchover = "10 or 11".
Pr.811 setting
0
1
10
11
*1 For details on the increments of speed setting and running speed monitoring, refer to
NOTE
• The internal resolution of the torque limit is 0.024% (100/2
• When Real sensorless vector control is selected, fractions below a resolution equivalent to 0.1% are rounded off even if Pr.811
= "10 or 11" is set.
• For details on changing the speed setting increments, refer to
 Changing the torque characteristic of the constant-power range (Pr.801,
Pr.803)
• Under Real sensorless vector control or Vector control, the torque characteristic can be changed between in the low-speed
range and in the constant power range.
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Output
frequency
(Hz)
Set
frequency
Torque limit
Acceleration
level
Pr.816
Pr.817
Torque limit level
during acceleration
Increments of speed setting and running speed
monitoring
1 r/min
0.1 r/min
1 r/min
0.1 r/min
5.3 Speed control under Real sensorless vector control, vector control, PM sensorless vector control
search engine
-2 Hz < set speed - rotation speed < 2 Hz
Constant speed
1s
Torque limit set to Pr.810
*1
0.1%
0.01%
12
), and fractions below this resolution are rounded off.
page 444.
-2 Hz set speed - rotation speed
Time
Deceleration
Torque limit level
during deceleration
Torque limit setting
increments
page 444.
5. PARAMETERS
1
2
3
4
5
6
7
8
9
10
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