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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).
(Note)
Power supply
W
V
U
Ensure to connect it to PE
terminal of the servo amplifier.
Do not connect it directly to the
protective earth of the control
panel.
Control box
Servo motor
M
U
V
W
Encoder
CN2
Servo amplifier
L
11
L
1
L2
L
3
L21
CN1
Protective earth (PE)
Outer
box
MCNFB
Line filter
Programmable
controller
Note. For 1-phase 200 to 230VAC or 1-phase 100 to 120VAC, connect the power supply to L1 L2 and leave L3 open.
There is no L3 for 1-phase 100 to 120VAC power supply. For the specification of power supply, refer to section 1.3.