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4 Servo Adjustment
MITSUBISHI CNC
4-6-3 Vertical axis pull-up control
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.
< Adjustment procedure >
[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
CAUTION