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3. SIGNALS AND WIRING
3.12 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).
L1
L2
L
3
L
11
L
21
CN1A
NFB
MC
CN2
U
V
W
M
U
V
W
Control box
Servo amplifier
Line filter
Protective earth(PE)
Outer
box
Servo motor
Encoder
(Note)
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.
Note. For 1-phase 200V to 230VAC, connect the power supply to L1 L2 and leave L3 open.
There is no L
3 for 1-phase 100 to 120VAC power supply. Refer to section 1.3 for the power supply specification.