Mitsubishi Electronics IB-1500193(ENG)-D ユーザーズマニュアル

4 - 50

Even when the vertical axis drop prevention control is applied, the axis will drop several 

μm due to the 

mechanical play of the motor brakes. Work could be damaged especially when the power fails during 

machining. For the vertical machining center, etc., vertical axis pull-up control protect works from 

collision by slightly pulling the vertical axis when an emergency stop (including the power failure) 

occurs.

If the pull-up control itself has possibility to cause interference during synchronous tapping machining or 

soft limit's stop, vertical axis pull-up control suppression command (servo control input 4/bit2) is input 

from NC and stops the pull-up control.

[1] Set "4-6-2 Vertical axis drop prevention control".

[2] Set servo function selection 2 SV033/bitE = 1 (Vertical axis drop prevention control will start).

[3] Set the torque offset SV032. The pull-up directions is distinguished by this setting value's sign.

Refer to "4-4-5 (1) Measuring unbalance torque and frictional torque measurement" for details on 

the setting.

[4] Input emergency stop when axes stop and confirm the subject axis to be retracted upward.

[5] If the pull-up range is insufficient, adjust vertical axis pull-up distance SV095.

This function is valid for Z axis in the vertical machining center. Basically it cannot be used with the 

horizontal machining center's Y axis or the lathe's X axis as collisions could occur. Check the 

machine's working conditions carefully before using this function.

 

OFF

 

ON

 

ON

 

OFF

 

 

AC source input

 

Drop according to the brake play
after the READY OFF

 

Vertical axis pull-up control operation sequences when the power fails

80μm

（For PIT=10, PC1=1, PC2=1 or SV095=0）

Power down detection output 
from converter

Axis position which 
Vertical axis pull-up 
function is set in.

Emergency stop

Motor brake 
control output

Power fialer occurs.

Detection period of phase 
interruption or instantaneous 
power interrupt

Axis rise