
4.POWER SUPPLY CONNECTION B-63943EN/02
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interface unit, stand-alone type LCD unit, control power supply of the
servo amplifier, and separate detector (such as a scale).
As for a PANEL i, no specific power-off sequence for the CNC
control unit is required.
CAUTION
When the PANEL i is used, the OS must be shut
down before the power to the control unit is turned
off. Be careful not to turn off the power while the
hard disk is being accessed or before the OS has
terminated; otherwise, the hardware contents may
be destroyed.
When the power is turned off or when the power is momentarily
disconnected, processing must be performed from the machine as
necessary, because motor control is disabled.
For example, when movement along a vertical axis is controlled, a
brake should be applied to prevent falling. Usually, the brake clamps
the motor when the servo is not activated or when the motor is not
turning. The clamp is released only when the motor is turning.
When servo axis control is disabled by power-off or momentary
power disconnection, the brake usually clamps the servo motor. In
this case, before the relay for clamping operates, the controlled axis
may fall. So, also consider whether the distance the axis is likely to
fall will cause a problem.
When the power is turned off:
Be sure to apply a brake for clamping before turning off the
power to CNC.
When the power fails:
If a power failure is detected, a brake must be applied
immediately. Select the power supply with a longer DC power
retention time after AC power-off, because the servo is
deactivated if the power to CNC is turned off.