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3. SIGNALS AND WIRING
3.5 Grounding
WARNING
Ground the servo amplifier and servo motor securely
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.
Control box
Servo amplifier
L
11
L
21
P
N
Li
n
e
f
ilt
er
NFB
MC
Earth plate
CN2
U
V
W
Outer
box
Servo motor
M
U
V
W
Power
supply
Ensure to connect it to PE
terminal of the servo amplifier.
Do not connect it directly to
the protective earth of the
control panel.
L
2
L
3
L
1
L
21
L
11
Converter
unit
P
N
Pro
g
ram
m
able
c
ont
roller
Encoder
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