YASKAWA SGMSS - Wiring for Noise Control

5.4 Special Wiring
5-13
5
5.4.2 Wiring for Noise Control
(1) Wiring Example
The SGDS SERVOPACK 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 SERVOPACK is not appro-
priate. To prevent this, always wire and ground the SERVOPACK correctly.
The SGDS SERVOPACK has a built-in microprocessor (CPU), so protect it from external noise as much as pos-
sible by installing a noise filter in the appropriate place.
The following is an example of wiring for noise control.
For ground wires connected to the casing, use a thick wire with a thickness of
at least 3.5 mm (0.005 in ) (preferably, plain stitch cooper wire)
2
should be twisted-pair wires.
When using a noise filter, follow the precautions in (3) Using Noise Filter.
U
W
V
L2
L1
L3
L2C
L1C
CN2
CN1
SGDS
SERVOPACK
Servomotor
Operation relay
sequence circuit
1LF
AVR
(Ground)
(Casing)
(Casing)
(Casing)
(Casing)
(Ground plate)
2LF
3.5 mm
2
(0.005 in
2
)
min.
200 VAC
Noise filter
∗3
∗3
∗1
∗1
∗2
∗3
∗1
∗2
2
mm
2
(0.003 in
2
) min.
3.5mm
2
(0.005 in
2
) min.
∗
1
2.0 mm
2
(0.003 in
2
)
min .
3.5mm
2
(0.005 in
2
)
min.
PG
(FG)
M
Wires of 3.5 mm
2
(0.005 in
2
) or more
Ground: Ground to an independent ground
(at least class-3 grounding (100 Ω max.)
2
Ferrite core (two turns)
Host controller
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