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3.SAFETY FUNCTIONS
3.20
B-64303EN-4/01
SAFE SPINDLE STOP FUNCTION
During machine tool setup, the operator may attach or detach a
workpiece in the machining area with the protective door opened.
Conventionally, the following measures have been used to ensure
safety in such work:
•
The emergency stop state is set to turn off the power to the
spindle and feed axes.
•
A device such as a magnetic contactor is installed between the
servo amplifier and servo motor and between the spindle
amplifier and spindle motor.
This function turns off the power to the spindle in a safe manner based
on the dual monitoring function. For this purpose, this function
outputs the state signal (excitation-off signal) of the power output
circuit built into the spindle amplifier as two independent signals from
the spindle amplifier and assigns them as Programmable Safety I/O
signals (Section 5.4).
By using this function, safety can be secured in turning off the power
to the spindle only, without using an emergency stop or magnetic
contactor. So, machine usability can be enhanced.
A function for rotating the spindle by power with the door open can be
additionally used by setting a spindle rotation enable switch.
Protective door
PMC CPU
Guard State
Safety
signal
I/O
Spindle Excitation-Off signal 1
(EXOF1)
αi SP
Spindle
Motor
State
monitor
ladder
Cross
αi SV
Servo
Motor
check
αi PS
Safety
CNC CPU
Contact
I/O
output
Spindle
Spindle Rotation
rotation enable
Enable Switch
switch
signal (SPEN1,2)
State
monitor
ladder
Cut command and check signal
Spindle Excitation-Off signal 2
(EXOF2)
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AC reactor
Magnetic
contactor