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Sigma II User's Manual
Note: SGDH servo amplifiers do not have built-in ground protection circuits. To configure a safer system,
install a ground fault interrupter with or without a circuit breaker for protection against overload and
short circuit conditions.
5.8.2
Wiring for Noise Control
n
Wiring Example
This servo amplifier uses high-speed switching elements in the main circuit. It may
receive "switching noise" from these high-speed switching elements if wiring or
grounding around the servo amplifier is not appropriate. To prevent this, always
wire and ground the servo amplifier correctly.
This servo amplifier has a built-in microprocessor (CPU). To protect it from exter-
nal noise install a noise filter in the appropriate place.
The following is an example of wiring for noise control.
Noise filter***
AC200V
2
0.005in.
2
(3.5mm
)
minimum
Notes: *When using a noise filter, follow the precautions in Using a Noise Filter on the following page.
**For ground wires connecting to the casing, use a wire with a thickness of at least 0.005in
2
(3.5mm
), preferably a braided flat copper wire.
2LF
(Casing)
•Operation relay
sequence
•Signal generation
circuit (provided
by user)
P
1LF*
P
P
(Casing)
(Casing)
2
2
Wires of 0.005in.
(3.5mm
)minimum
P: Indicates twisted pair wires
Chapter 5: Parameter Settings and Functions
Servo amplifier
L1
L2
L3
L1C
CN2
L2C
CN1
AVR
(Ground)
2
2
0.003in.
(2mm
) minimum
2
2
0.005in.
(3.5mm
)minimum
(Casing)
(Casing)
5-105
Servomotor
U
M
V
(FG)
W
PG
2
0.003in.
2
(2mm
)
minimum
2
0.005in.
2
(3.5mm
)
minimum
**
2
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