Mitsubishi Electric MELDAS C6 Interface Manual page 5

CAUTION
3. Items related to design
Always turn the spindle phase synchronization complete signal ON before
chucking both ends of the workpiece to the basic spindle and synchronous
spindle. If the spindle phase synchronization signal is turned ON when both ends
of the workpiece are chucked to the basic spindle and synchronous spindle, the
chuck or workpiece could be damaged by the torsion that occurs during phase
alignment.
If the temperature rise detection function is invalidated with the parameters, the
control could be disabled when the temperature is excessive. This could result in
machine damage or personal injuries due to runaway axis, and could damage the
device. Enable the detection function for normal use.