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3. SIGNALS AND WIRING
3.8 Grounding
WARNING
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.
The servo amplifier switches the power transistor on-off to supply power to the servo motor. Depending on
the wiring and ground cablerouting, 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).
L
1
L
2
L
3
L
11
L
21
CN1A
NFB
MC
CN2
U
V
W
SM
U
V
W
(Note 2)
Control box
Servo amplifier
Line filter
Protective earth(PE)
Outer
box
Servo motor
Encoder
(Note 1)
Power supply
3-phase
200 to 230VAC,
1-phase
230VAC or
1-phase
100 to 120VAC
Note: 1. For 1-phase 230VAC, connect the power supply to L
1
L
2
and leave L
3
open.
There is no L
3
for 1-phase 100 to 120VAC power supply.
Servo system
controller
Ensure to connect it to PE
terminal of the servo amplifier.
Do not connect it directly
to the protective earth of
the control panel.
2. 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.