Mitsubishi FR-A800

Torque control under Real sensorless vector control and vector control
PARAMETERS
227
5
5.4.8 Torque control by variable-current limiter
control
• By adding the bias amount to the line speed (master speed) as the speed command value to saturate the speed controller
and changing the torque limit value, torque control can be performed.
• For a positive bias amount (the speed command value faster than the line speed), power driving is applied, and for a
negative bias amount (the speed command value slower than the line speed), regenerative driving is applied.
• Speed control is the basic control. For how to set the speed command and torque limit value, refer to the description of
speed control (page 177).
• Under speed control with Pr.800="0 or100", when the speed command value is changed by an external force, the torque
limit is invalid during a change in the speed command value to adjust the internal speed command value to the actual
speed.
• Under variable speed limiter control with Pr.800="6 or 106", the process to adjust the speed command value to the actual
speed is not performed, and thus the torque limit remains valid. This prevents torque from suddenly changing at a speed
change.
NOTE
• When Pr.800="6 or 106" (torque control by a variable-current limiter), Pr.690 Deceleration check time and Pr.873 Speed
limit are ignored.
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Parameters referred to
Pr.690 Deceleration check time page 206
Pr.873 Speed limit page 206
Pr.800 Control method selection page 164
By changing the torque limit value for speed control, torque control can be performed.
Pr. Name Initial value Setting range Description
800
G200
Control method selection
20
6 Vector control
Variable-current limiter
torque control
106
Vector control
(fast-response operation)
0 to 5, 100 to 105 Vector control
9, 109 Vector control test operation
10 to 12, 100 to 112 Real sensorless vector control
13, 14, 113, 114 PM sensorless vector control
20
V/F control (Advanced magnetic flux vector control,
PM sensorless vector control)
Line speed
Speed command value
Torque limit value
(absolute value)
Generated torque
Power driving
Regenerative driving
0
0
0
Line speed
Speed command
value
Pr.800=0, 100
0
0
0
Torque limit value
(absolute value)
Line speed
Speed command
value
Generated torque
0
0
0
Torque limit value
(absolute value)
Pr.800=6, 106