Torque Limit Function - Mitsubishi Electric MELSEC Q Series Programming Manual

7 AUXILIARY AND APPLIED FUNCTIONS

7.3 Torque Limit Function

Setting method
Parameter block
Servo program
Torque limit value
change request
(CHGT)
Motion SFC
program
Torque limit value
individual change
request (CHGT2)
QDS
This function restricts the generating torque of the servo motor within the setting range.
If the torque required for control exceeds the torque limit value during positioning
control, it restricts with the setting torque limit value.
(1) Default of the torque limit value
The default 300[%] is set as torque limit value at the servo amplifier's power
supply or Multiple CPU system's power supply ON.
POINTS
Even while the Multiple CPU system power supply is ON, the torque limit value is
returned to the default value of 300[%] when the control circuit power supply of the
servo amplifier is turned ON again, or when the SSCNET communication is
disconnected or connected again. Set the torque control value again as required
using the Motion SFC program or the Motion dedicated PLC instruction.
(2) Setting method of torque limit value
Set the torque limit value by the following method.
The positive direction of torque limit value restricts the forward rotation (CCW)
driving and reverse rotation (CW) regenerative torque of servo motor, and the
negative direction of torque limit value restricts the reverse rotation (CW) driving
and forward rotation (CCW) regenerative torque.
Set the torque limit value in the parameter block.
By setting the parameter block No. used in the servo
program, the torque limit value of specified axis is
changed to same value for both of positive direction and
negative direction for every positioning control.
Set the torque limit value in the parameter block.
By setting the parameter block in the home position
return data and JOG operation data for every axis, the
torque limit value at home position return and JOG
operation is changed to same value for both of positive
direction and negative direction.
By setting the torque limit value in the servo program, the
torque limit value of specified axis at servo program
execution is changed to same value for both of positive
direction and negative direction.
By executing the torque limit value change request
(CHGT) in the operating control step of Motion SFC
program, the torque limit value of specified axis is
changed to same value for both of positive direction and
negative direction.
By executing the torque limit value individual change
request (CHGT2) in the operating control step of Motion
SFC program, the torque limit value of specified axis is
changed to different value for positive direction and
negative direction.
Setting details
7 - 6
Setting range Setting units
1 to 1000 [%]
1 to 10000 [0.1%]
Reference
Section
4.3
Section
5.3
(Note-1)