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3. SIGNALS AND WIRING
3.8 Grounding
WARNING
Ground the base unit and servo motor securely.
To prevent an electric shock, always connect the protective earth (PE) terminal of
the base unit with the protective earth (PE) of the control box.
The base unit switches the power transistor on-off to supply power to the servo motor. Depending on the
wiring and ground cablerouting, MELSERVO-J2M 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).
W
U
U
W
CN2
M
V
L
11
L21
L1
L2
L3
MC
CN1A
CN2
FR-BAL
CNP2
U
V
W
CNP2
U
V
W
M
V
NFB
Control box
Servo motor
Power
supply
3-phase
200 to
230VAC
(Note 4)
1-phase
200 to
230VAC
Encoder
Servo motor
Base unit
Encoder
(Note 3)
(Note 3)
Drive unit
Drive unit
Interface unit
(Note 1)
Protective earth(PE)
3. Ensure to connect it to PE terminal of the drive unit. Do not connect it directly to the protective earth of the control panel.
4. For 1-phase 230VAC, connect the power supply to L
1 L2 and leave L3 open.
Note 1. To reduce the influence of external noise, we recommend you to ground the bus cable near
the controller using a cable clamping fixture or to connect three or four data line filters in series.
2. The mounting screw of the drive unit is also used for PE connection of the servo motor.
Line filter
(Note 2)
(Note 2)
Servo system
controller
(Earth)
(Earth)