
B–62073E/04
5. POWER SUPPLY UNIT AND INPUT
UNIT CONNECTION
104
Power ON the power supplies in the following order or simultaneously:
1 Power supply (200 VAC) for entire machine tool
2 Power supply (I/O Unit–MODEL A, etc.) for slave I/O
devices connected via I/O Link and power supply (24 VDC)
for servo amplifier
3 Power supply (200 VAC) for control unit
Leave the memory backup battery and separate absolute pulse coder
battery connected regardless of the ON/OFF state of the control unit
power supply. If these batteries are removed with the control unit turned
OFF, parameters, part programs, pulse coder position data and other data
stored on the control unit will be lost.
For details, see “3.7.3 Replacing the battery.”
Power OFF the power supplies in the following order:
1 Power supply (200 VAC) for control unit
2 Power supply (I/O Unit–MODEL A, etc.) for slave I/O
devices connected via I/O Link and power supply (24 VDC)
for servo amplifier
3 Power supply (200 VAC) for entire machine tool
The motor cannot be controlled when the power is turned OFF or if a
power interruption occurs. Adopt the required corrective action on the
machine tool for trouble that arises from the inability to control the motor.
For example, insert a brake to prevent the shaft from falling when the shaft
operating in the gravity shaft direction is being controlled. The brake
clamps the motor when the servo has not started up or when the motor is
not operating, and unclamps the motor only while it is operating. In other
words, the servo motor is normally clamped when a power OFF or power
interruption prevents servo axis control. The axis being controlled may
fall in the time up to activation of the motor clamp relay. So, you must
evaluate whether or not the amount that the axis falls is a problem.
NOTE
When the MMC–IV and intelligent terminal are used, shut
down the OS before you turn the control unit OFF. If the
power is turned OFF during accessing of the hard disk or
while the operating system is still running, data on the hard
disk is more likely to be damaged. Avoid this at all costs.
5.2.4
Power ON Sequence
5.2.5
Power OFF Sequence