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3. SIGNALS AND WIRING
3.10 Grounding
WARNING
Ground the servo amplifier and servo motor securely.
To prevent an electric shock, always connect the protective earth (PE) terminal
(terminal marked
) 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 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).
Control box
Servo amplifier
L
1
L
2
L
3
CN1
Line filter
NFB
MC
Protective earth(PE)
CN2
U
V
W
Outer
box
Servo motor
Ensure to connect it to PE
terminal of the servo amplifier.
Do not connect it directly to
the protective earth of
the control panel.
Encoder
M
U
V
W
(Note)
Power supply
Programmable
controllers
Note. For 1-phase 230VAC, connect the power supply to L
1
, L
2
and leave L3 open. Refer to section 1.3 for the power supply
specification.
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