Mitsubishi Electric MELSERVO MR-J4-B-LL Series Instruction Manual page 3

1. To prevent electric shock, note the following
Before wiring, turn off the power and wait for 15 minutes or more (20 minutes or more for converter unit)
until the charge lamp turns off. Then, confirm that the voltage between P+ and N- (between L+ and L- for
converter unit) is 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. Otherwise, it
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 an electric shock, be sure to connect the protective earth (PE) terminal (marked
servo 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 smoke or a fire.
Be sure to connect a magnetic contactor between the power supply and the main circuit power supply
(L1, L2, and L3) of the servo amplifier, in order to configure a circuit that shuts off the power supply by
the magnetic contactor. If a magnetic contactor is not connected, continuous flow of a large current may
cause smoke or a fire when the servo amplifier malfunctions.
Be sure to connect a molded-case circuit breaker or a fuse to each servo amplifier between the main
circuit power supply and the power supply (L1, L2, and L3) of the servo amplifier, in order to configure a
circuit that shuts off the power supply by the molded-case circuit breaker or the fuse. 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.
When using a regenerative resistor, shut the power off with the alarm signal. Otherwise, a regenerative
transistor malfunction or the like may overheat the regenerative resistor, causing smoke or a fire.
Provide adequate protection to prevent screws and other conductive matter, oil and other combustible
matter from entering the servo amplifier and servo motor.
WARNING
CAUTION
A - 2
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