
SAFETY PRECAUTIONS (FANUC SERVO MOTOR AMPLIFIER series)
B–65235EN/02
20
3
WARNINGS AND CAUTIONS RELATING TO MAINTENANCE
WARNING
F Read the maintenance manual carefully and ensure that you are totally
familiar with its contents.
This manual describes daily maintenance and the procedures to be followed in the event of an
alarm being issued. The operator must be familiar with these descriptions.
F Notes on replacing a fuse or PC board
1) Before starting the replacement work, ensure that the circuit breaker protecting the power
magnetics cabinet is open.
2) Check that the red LED that indicates that charging is in progress is not lit. The position
of the charging LED on each model of amplifier is given in specification manual. While
the LED is lit, hazardous voltages are present inside the unit, and thus there is a danger of
electric shock.
3) Some PC board components become extremely hot. Be careful not to touch these
components.
4) Ensure that a fuse having an appropriate rating is used.
5) Check the specification code of a PC board to be replaced. If a modification drawing number
is indicated, contact FANUC before replacing the PC board. Also, before and after replacing
a PC board, check its pin settings.
6) After replacing the fuse, ensure that the screws are firmly tightened. For a socket–type fuse,
ensure that the fuse is inserted correctly.
7) After replacing the PC board, ensure that it is securely connected.
8) Ensure that all power lines, power supply lines, and connectors are securely connected.
F Take care not to lose any screws.
When removing the case or PC board, take care not to lose any screws. If a screw is lost inside
the nit and the power is turned on, the machine may be damaged.
F Notes on replacing the battery of the absolute pulse coder
Replace the battery only while the power is on. If the battery is replaced while the power is turned
off, the stored absolute positioning data will be lost. Some series servo amplifier modules have
batteries in their servo amplifiers. To replace the battery of any of those models, observe the
following procedure: Open the door of the power magnetics cabinet; Leave the control power
of the power supply module on; Place the machine in the emergency stop state so that the power
being input to the amplifier is shut off; Then, replace the battery. Replacement work should be
done only by a person who is trained in the related maintenance and safety requirements. The
power magnetics cabinet in which the servo amplifier is mounted has a high–voltage section.
This section presents a severe risk of electric shock.