Mitsubishi Electric MR-J4W2, Instruction Manual

Page: 75 / 542

3. SIGNALS AND WIRING
3 - 38
3.11 Grounding
WARNING
Ground the servo amplifier and servo motor securely.
To prevent an electric shock, always connect the protective earth (PE) terminal
(marked ) of the servo amplifier to the protective earth (PE) of the cabinet.
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
Cabinet
Servo amplifier
Protective earth (PE)
Outer box
L1
L2
L3
CNP1
L11
L21
CNP2
MC MCCB
W
V
U
A-axis servo motor
M
U
W
CN2A
CNP3A
Encoder
(Note 3)
V
W
V
U
B-axis servo motor
M
U
W
CN2B
CNP3B
Encoder
(Note 3)
V
W
V
U
C-axis servo motor
(Note 2)
M
U
W
CN2C
CNP3C
Encoder
(Note 3)
V
Line filter
Ser
vo system
controller
Note 1. For power supply specifications, refer to section 1.3.
2. For the MR-J4 3-axis servo amplifier
3. Be sure to connect it to of CNP3A, CNP3B, and CNP3C. Do not connect the wire directly to
the protective earth of the cabinet.