Grounding - Mitsubishi Electric Melservo MR-J3-A Instruction Manual

3. SIGNALS AND WIRING

3.12 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).
NFB
(Note)
Power supply
Note. For 1-phase 200V to 230VAC or 1-phase 100 to 120VAC, connect the power supply to L
There is no L for 1-phase 100 to 120VAC power supply. For the specification of power supply, refer to section 1.3.
3
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.
Control box
Protective earth(PE)
MC Servo amplifier
CN2
L
1
L
2
L
3
L
11
U
L
21
V
W
CN1A CN1B
Outer
box
3 - 74
Servo motor
Encoder
U
V M
W
Ensure to connect it to PE
terminal of the servo amplifier.
Do not connect it directly to
the protective earth of
the control panel.
L and leave L open.
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