Grounding - Mitsubishi Electric MR-J4W2 Instruction Manual

3. SIGNALS AND WIRING

3.11 Grounding

WARNING
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).
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.
MCCB
(Note 1)
Power
supply
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
the protective earth of the cabinet.
Cabinet
Servo amplifier
CNP1
MC
L1
L2
CNP3A
L3
U
CNP2
V
L11
W
L21
CNP3B
U
V
W
CNP3C
U
V
W
Protective earth (PE)
of CNP3A, CNP3B, and CNP3C. Do not connect the wire directly to
3 - 38
A-axis servo motor
CN2A
Encoder
U
V
W
(Note 3)
B-axis servo motor
CN2B
Encoder
U
V
W
(Note 3)
C-axis servo motor
(Note 2)
CN2C
Encoder
U
V
W
(Note 3)
Outer box
M
M
M