Torque Control By Variable-Current Limiter Control - Mitsubishi Electric 800 Series Instruction Manual

5.4.8
Torque control by variable-current limiter
control
By changing the torque limit value for speed control, torque control can be performed.
Pr. Name
800
Control method selection
G200
451 Second motor control
G300 method selection
• 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 147).
Speed command value
Torque limit value
(absolute value)
Generated torque
• Under speed control with Pr.800 = "0 or 100", 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.
Speed command
value
Line speed
Torque limit value
(absolute value)
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.
Parameters referred to ???????
Pr.690 Deceleration check time
Pr.873 Speed limit page 179
Pr.800 Control method selection, Pr.451 Second motor control method selection
Torque control under Real sensorless vector control and vector control
Vector Vector Vector
Initial value
6
106
0 to 5, 100 to 105
20 9, 109
10 to 12, 100 to 112
13, 14, 113, 114
20
0 to 6, 10 to 14, 20,
100 to 106,
9999
110 to 114
9999
Line speed
0
0
Power driving
0
0
0
0
Pr.800=0, 100
page 179
Setting range
Vector control
Vector control
(fast-response operation)
Vector control
Vector control test operation
Real sensorless vector control
For manufacturer setting. Do not set.
V/F control (Advanced magnetic flux vector control,
PM sensorless vector control)
Select the control method for the second motor.
The second motor is enabled when the RT signal is ON.
The setting range is the same as that of Pr.800.
The Pr.800 setting is used.
Regenerative driving
Speed command
value
Line speed
0
Torque limit value
(absolute value)
0
Generated torque
0
page 137
Description
Variable-current limiter
torque control
Pr.800=6, 106
PARAMETERS
5
203