Mitsubishi Electric MELSERVO-J3W Series, Instruction Manual

Page: 71 / 500

3. SIGNALS AND WIRING
3 - 38
3.12 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).
(Note 1)
Power
supply
W
V
U
Control box
A-axis servo motor
M
U
V
W
CN2A
Servo amplifier
CNP3A
Protective earth (PE)
Outer
box
L
1
L
2
L
3
CNP1
L
11
L
21
CNP2
(Note 2)
Encoder
W
V
U
B-axis servo motor
M
U
V
W
CN2B
CNP3B
(Note 2)
Encoder
MC MCCB
Line f
ilt
er
S
e
rv
o s
yst
em
cont
ro
ller
Note 1. For 1-phase 200V to 230VAC, connect the power supply to L
1
L
2
and leave L
3
open. Refer to section 1.3 for the
power supply specification.
2. Ensure to connect it to of a CN3A/CN3B connector. Do not connect it directly to the protective earth of the
control panel.