Mitsubishi Electric MELSERVO MR-J3 A Series, Instruction Manual

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3. SIGNALS AND WIRING
3.12 Grounding
WARNING
Ground the servo amplifier and servo motor securely.
To prevent an electric shock, always connect the protective earth (PE) terminal of
the servo amplifier with the protective earth (PE) of the control box.
The servo amplifier switches the power transistor on-off to supply power to the servo motor. Depending on the
wiring and ground cable routing, the servo amplifier may be affected by the switching noise (due to di/dt and
dv/dt) of the transistor. To prevent such a fault, refer to the following diagram and always ground.
To conform to the EMC Directive, refer to the EMC Installation Guidelines (IB(NA)67310).
Control box
Servo amplifier
L
1
L
2
L
3
L
11
L
21
CN1A CN1B
Li
ne
fi
lter
NFB
MC
Protective earth(PE)
CN2
U
V
W
Outer
box
Servo motor
Ensure to connect it to PE
terminal of the servo amplifier.
Do not connect it directly to
the protective earth of
the control panel.
Encoder
M
U
V
W
P
rogra
m
m
able
co
nt
roller
(Note)
Power supply
Note. For 1-phase 200V to 230VAC or 1-phase 100 to 120VAC, connect the power supply to L
1
L
2
and leave L
3
open.
There is no L
3
for 1-phase 100 to 120VAC power supply. For the specification of power supply, refer to section 1.3.