YASKAWA SIEMENS CNC Series, Maintenance Manual, Serviceman Handbook

Page: 286 / 373

Drive set-up procedure
14.3.8 Torque Control and Fixed Stop Function
14-76
„ Spindle drive
• MD6423 (Cn423) TORQUE_LIMIT_SELECT (For each axis)
Meaning: Variable torque limit selection
Torque limit command from CNC is enabled.
Setting value: 0---disabled
1---enabled
Note: You must specify "1".
For Fixed Stop function, the tail stock press control, for example, is processed on the follow-
ing steps.
1. With CNC program command, the feed axes moves toward the object and simulta-
neously the torque control is enabled.
• CNC programming: G01X100. FXS [X] = 1
• CNC sends the torque control value set with the machine data MD37010 or FXST
command.
2. The feed axis contacts the object and then the torque and the amount of deviation
increase.
3. Drive torque reference is cramped at the limiting value. The amount of deviation
increases further.
4. When the increment of position deviation from steady state of Step 1 reaches the setting
value with the machine data MD37030,
• the drive is switched over to the speed control state and the torque is maintained with
the torque control. (Speed reference is internally output. Position deviation = 0.
• CNC program transfers to the nest block.
In this way, the torque control state is enabled with the torque control.
5. When FXS[X] = 0 command is output,
• the drive returns to the steady state.
In this way, Fixed Stop function is disabled and the normal position control state is
recovered. The pressing is released with the reverse procedure of Step 1.