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8
1-3 Safety function required for the actuator
a)
Power overload detection.
When motor overload occurs, the detection activates and cut off servo power.
b)
Soft limit sensors
Soft limits can be set on each axis to limit the working envelope in manual
operation after return-to-home and during automatic operation.
NOTE. Working envelope is the area limited by soft limits.
c)
Mechanical stopper
If the servo power has suddenly been shut off during high-speed operation by
emergency stop or safety functions, these mechanical stoppers prevent the axis
from exceeding the movement range. No mechanical stopper is provided on the
rotating axis.
NOTE. Movement range is the area limited by mechanical stoppers.
WARNING
Axis movement will not stop immediately after servo power supply is cut off by
emergency stop or other safety functions.
d)
Brake for vertical axis
An electromagnetic brake installation is essential on the vertical axis to
prevent sliding down of the axis when servo power is cut off. This brake shall be
working when the controller is off, or when the vertical axis servo power is off
even with controller is on. The vertical axis brake can be released by means of
the programming unit or by commands in the program when controller is on.
WARNING
The vertical axis will slide down when brake are released, and may cause
hazardous situation.
Use a support to prop the vertical axis before releasing the break, while
emergency stop is activated.
Be careful not to get caught between the axis and the installing base when
releasing the brake to perform direct teaching.
