
5. POWER SUPPLY UNIT CONNECTION
B–63783EN/01
60
Power off units in the following sequence or simultaneously:
1. CNC control unit (200VAC)
2. Slave I/O unit connected by I/O Link, separate detector I/F
unit and LCD unit (24VDC), servo amplifier control
3. (200VAC) of overall machine tool, separate detector (scale)
“Simultaneously” here means 2 and 3 may be turned off within 500 ms
before 1 is turned off. If 2 and 3 are turned off earlier, alarm information
remains in the CNC.
Though the CNC display unit with PC functions is not subject to any
power off sequence limitations, exit the application and OS according to
the regular shutdown procedure before it is powered off.
Motor control is not possible when the power is turned off or a momentary
power interruption occurs. Take the required action on the machine tool
side for any irregularities that may occur as a result of not being to control
the motor.
For example, apply the brake to prevent the shaft from falling when
controlling axes that move in the gravity axis direction. If servos do not
start normally, or if the motor does not operate, clamp the motor, and
unclamp only the currently operating motor. Normally clamp the servo
motor, if the servo axis cannot be controlled when the power is turned off
or a momentary power interruption occurs. When you clamp the servo
motor, the axes that are currently being controlled may fall within the time
until the relays for clamping the servo motor. So, whether or not problems
will occur in the axis travel distance must be carefully evaluated.