Mitsubishi Electric MELSERVO-J4 Series Transition Handbook page 3

1. To prevent electric shock, note the following
Before wiring or inspection, turn off the power and wait for 15 minutes or more (when 30 kW or more is
used, 20 minutes or more) until the charge lamp turns off. Then, confirm that the voltage between P+ and
N- is (when 30 kW or more is used, L+ and L-) safe with a voltage tester and others. Otherwise, an electric
shock may occur. In addition, when confirming whether the charge lamp is off or not, always confirm it
from the front of the servo amplifier.
Ground the servo amplifier and servo motor securely.
Any person who is involved in wiring and inspection should be fully competent to do the work.
Do not attempt to wire the servo amplifier and servo motor until they have been installed. Doing so may
cause an electric shock.
Do not operate switches with wet hands. Otherwise, it may cause an electric shock.
The cables should not be damaged, stressed, loaded, or pinched. Otherwise, it may cause an electric
shock.
During power-on or operation, do not open the front cover of the servo amplifier. Otherwise, it may cause
an electric shock.
Do not operate the servo amplifier with the front cover removed. High-voltage terminals and charging area
are exposed and you may get an electric shock.
Except for wiring and periodic inspection, do not remove the front cover of the servo amplifier even if the
power is off. The servo amplifier is charged and you may get an electric shock.
To prevent electric shock, always connect the protective earth (PE) terminal (
amplifier to the protective earth (PE) of the cabinet.
To avoid an electric shock, insulate the connections of the power supply terminals.
2. To prevent fire, note the following
Install the servo amplifier, servo motor, and regenerative resistor on incombustible material. Installing
them directly or close to combustibles will lead to a fire.
Be sure to connect a magnetic contactor between the power supply and the main circuit power supply
(L1/L2/L3) of the servo amplifier, in order to configure a circuit that shuts off the power supply by the
magnetic contactor. If the magnetic contactor is not connected, a continuous flow of a large current may
cause smoke or a fire when the servo amplifier malfunctions.
When using the regenerative resistor, switch power off with the alarm signal. Not doing so may cause
smoke and fire when a regenerative transistor malfunctions or the like may overheat the regenerative
resistor.
Provide adequate protection to prevent screws and other conductive matter, oil and other combustible
matter from entering the servo amplifier and servo motor.
Be sure to connect a magnetic contactor for each servo amplifier between the power supply and the main
circuit power supply (L1/L2/L3) of the servo amplifier, in order to configure a circuit that shuts off the
power supply by the magnetic contactor. If a molded-case circuit breaker or fuse is not connected, a
continuous flow of a large current may cause smoke or a fire when the servo amplifier malfunctions.
WARNING
CAUTION
A - 2
marked) of the servo