Mitsubishi Electronics MDS-D-SVJ3 Manuel D’Utilisation

3 - 16

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.

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.

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