3 - 50
3. SIGNALS AND WIRING
3.12 Grounding
WARNING
Ground the driver and servo motor securely.
To prevent an electric shock, always connect the protective earth (PE) terminal
(terminal marked
) of the driver with the protective earth (PE) of the control box.
The driver switches the power transistor on-off to supply power to the servo motor. Depending on the wiring
and ground cable routing, the driver 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).
Servo amplifier
L
1
L
2
Li
ne
fil
ter
CN2
Outer
box
Encoder
M
U
V
W
Protective earth (PE)
P
ro
g
ra
m
m
a
b
le
l
o
g
ic
c
o
n
tr
o
lle
r
(Note)
Main circuit
power supply
CN1
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
MC
NFB
+
24V
0V
(Note)
Control
circuit
power
supply
Circuit
protector
Note. For the specification of power supply, refer to section 1.3.
Driver
driver.