
1.CONTROLLED AXIS NC FUNCTION B-63942EN/02
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1.44 UNEXPECTED DISTURBANCE TORQUE DETECTION
FUNCTION
Machine collision, defective, and damaged cutters cause a large load
torque on the servo and spindle motors, compared with normal rapid
traverse or cutting feed. This function detects the disturbance torque
on the motors and sends this value as an estimated load torque to the
PMC. If the detected disturbance torque value is abnormally great
compared with the value specified in the parameter, the function stops
the servo motor as early as possible or reverses the motor by an
appropriate value specified in a parameter, in order to minimize
possible damage to the machine.
The unexpected disturbance torque detection function is further
divided as follows:
(1) Estimated disturbance torque output function
The CNC is always calculating the estimated disturbance torque
for the motor (excluding acceleration/deceleration torque). The
estimated disturbance torque output function enables the PMC to
read the calculated torque using the window function.
(2) Unexpected disturbance torque detection alarm function
This function stops motors or reverses them by an amount
specified in a parameter, causing the CNC to output an alarm,
whenever the disturbance torque is greater than the value
specified in a parameter. (The function to reverse motors is
effective only for servo motors.)
Unexpected disturbance torque detection can also be disabled only for
specific axes by using parameter for the unexpected disturbance
torque detection function and unexpected disturbance torque detection
ignore signals. (This function is effective only for servo motors.)
1.45 ROTARY AXIS CONTROL
This function controls a rotary axis as specified by an absolute
command.
With this function, the sign of the value specified in the command is
interpreted as the direction of rotation, and the absolute value of the
specified value is interpreted as the coordinates of the target end
position.
This function is valid when rotary axis roll-over is enabled.
If the parameter is set, an absolute command specified for the roll-
over rotary axis is interpreted as follows: The sign and absolute value
of the value specified in the command represent the direction of
rotation and the end position of movement respectively.