Mitsubishi Electric RD77MS2 User Manual page 213

Continuous operation to torque control mode
■Operation for continuous operation to torque control mode
In continuous operation to torque control, the torque control can be executed without stopping the operation during the
positioning in position control mode or speed command in speed control mode.
During the continuous operation to torque control mode, the torque control is executed at the command torque set in
"[Cd.150] Target torque at continuous operation to torque control mode" while executing acceleration/deceleration to reach
the speed set in "[Cd.147] Speed limit value at continuous operation to torque control mode".
"[Cd.147] Speed limit value at continuous operation to torque control mode" and "[Cd.150] Target torque at continuous
operation to torque control mode" can be changed any time during the continuous operation to torque control mode. The
relation between the setting value of command torque and the torque generation direction of servomotor is fixed regardless of
the setting of servo parameters "Rotation direction selection/travel direction selection (PA14)" and "Function selection C-B
POL reflection selection at torque control (PC29)".
"Rotation direction selection/
travel direction selection
(PA14)"
0: Forward rotation (CCW) with the
increase of the positioning
address
1: Reverse rotation (CW) with the
increase of the positioning
address
Regardless of the setting in "Rotation direction selection/travel direction selection (PA14)", set a positive value
when torque command is in CCW direction of servomotor and a negative value when torque command is in
CW direction of servomotor in "[Cd.150] Target torque at continuous operation to torque control mode".
If the setting is incorrect, the motor may rotate in an opposite direction.
• The motor rotates in a direction according to the setting in "[Cd.150] Target torque at continuous operation
to torque control mode". Set the value corresponding to the motor rotation direction in "[Cd.147] Speed limit
value at continuous operation to torque control mode".
• Speed is not limited for reverse torque generation direction.
■Torque command setting method
During the continuous operation to torque control mode, set time for the command torque to increase from 0% to "[Pr.17]
Torque limit setting value" in "[Cd.151] Torque time constant at continuous operation to torque control mode (Forward
direction)" and for the command torque to decrease from "[Pr.17] Torque limit setting value" to 0% in "[Cd.152] Torque time
constant at continuous operation to torque control mode (Negative direction)". The value at continuous operation to torque
control mode switching request is valid for "[Cd.151]" and "[Cd.152]".
The command torque during the continuous operation to torque control mode is limited with "[Pr.17] Torque limit setting
value".
If torque exceeding the torque limit setting value is commanded, the warning "Torque limit value over" (warning code: 09E4H)
occurs, and the operation is controlled with the torque limit setting value.
Confirm the command torque to servo amplifier with "[Md.123] Torque during command".
During the continuous operation to torque control mode, "Torque limit" ("[Md.108] Servo status1": b13) does not turn ON.
Confirm the current torque value in "[Md.104] Motor current value".
n: Axis No. - 1
Monitor item
[Md.108] Servo status1: b13
"[Cd.150] Target torque at
continuous operation to
torque control mode"
Positive value (Forward direction)
Negative value (Reverse direction)
Positive value (Forward direction)
Negative value (Reverse direction)
Buffer memory address
2477+100n
Torque generation direction of servo motor
CCW direction
CW direction
CCW direction
CW direction
CCW
direction CW direction
7 EXPANSION CONTROL
211
7.1 Speed-torque Control
7