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3 Function Specifications
MITSUBISHI CNC
3-4 Protection function
3-4-1 Deceleration control at emergency stop
When an emergency stop (including NC failure, servo alarm) occurs, the motor will decelerate following the
set time constant while maintaining the READY ON state.
READY will turn OFF and the dynamic brakes will function after stopping. The deceleration stop can be
executed at a shorter distance than the dynamic brakes.
3-4-2 Vertical axis drop prevention/pull-up control
If the READY OFF and brake operation are commanded at same time when an emergency stop occurs, the
axis drops due to a delay in the brake operation.
The no-control time until the brakes activate can be eliminated by delaying the servo READY OFF sequence
by the time set in the parameters.
Always use this function together with deceleration control.
When an emergency stop occurs in a vertical machining center, the Z axis is slightly pulled upwards before
braking to compensate the drop of even a few μm caused by the brake backlash.
3-4-3 Earth fault detection
When an emergency stop is canceled, the earth fault current is measured using the power module's special
switching circuit before Servo ready ON.
Specifying the faulty axis is possible in this detection, as the detection is carried out for each axis.
Spindle
During power failure
Motor brake of
gravity axis
Pull up