Mitsubishi Electric Melservo-J3 Series MR-J3-B, Instruction Manual

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4. SIGNALS AND WIRING
4.12 Grounding
WARNING
Ground the servo amplifier and servo motor securely.
To prevent an electric shock, always connect the protective earth (PE) terminal
(terminal marked ) 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).
MCCB
W
V
U
M
U
V
W
L
11
L
1
L
2
L
3
L
21
MC
Control box
Power supply
(Note)
Line f
ilt
er
Servo amplifier
CN2
CN3
Servo motor
Encoder
Protective earth (PE)
P
ro
gra
mma
bl
e
cont
roller
Ensure to connect it to PE
terminal of the servo amplifier.
Do not connect the wire directly
the protective earth of
the cabinet.
Note. For 1-phase 200 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. Refer to section 1.2 for the power supply specification.