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12 - 2 
Chapter 12    Expansion Control
 
12.1 Speed-torque control 
12.1.1 Outline of speed-torque control 
This function is used to execute the speed control or torque control that does not 
include the position loop for the command to servo amplifier.   
"Continuous operation to torque control mode" that switches the control mode to 
torque control mode without stopping the servomotor during positioning operation is 
also available for tightening a bottle cap or a screw. 
Switch the control mode from "position control mode" to "speed control mode", "torque 
control mode" or "continuous operation to torque control mode" to execute the "Speed-
torque control". 
 
Control mode 
Control 
Remark 
Position control mode
Positioning control, OPR 
control, JOG operation, 
Inching operation and Manual 
pulse generator operation 
Control that include the position loop 
for the command to servo amplifier 
Speed control mode 
Speed-torque control 
Control that does not include the 
position loop for the command to 
servo amplifier 
Torque control mode 
Continuous operation 
to torque control mode
Control that does not include the 
position loop for the command to 
servo amplifier 
Control mode can be switched during 
positioning control or speed control. 
 
Use the servo amplifiers whose software versions are compatible with each control 
mode to execute the "Speed-torque control". 
Servo amplifier software versions that are compatible with each control mode are 
shown below. 
 
Servo amplifier model
Software version 
Speed control 
Torque control 
Continuous operation 
to torque control  1
MR-J4(W)-B/MR-JE-B
— — — 
MR-J3-_B 
— 
B3 or later 
C7 or later 
MR-J3W-_B 
— — 
Not 
compatible 
MR-J3-_BS 
— 
— 
C7 or later 
—: There is no restriction by the version. 
1: The torque generation direction of servomotor can be changed by setting the servo 
parameter "Function selection C-B POL reflection selection at torque control (PC29)" for the 
servo amplifier that is compatible with the continuous operation to torque control. (Refer to 
Section 12.1.4 "Operation of speed-torque control".) 
For the servo amplifier that is not compatible with the continuous operation to torque control, 
the operation is the same as that of when "0: Enabled" is set in servo parameter "Function 
selection C-B POL reflection selection at torque control (PC29)".