YASKAWA S Series User Manual page 94

5.7 Application Precautions
5.7.1 Noise Control
III Example of Wiring for Noise. Control
This SERVOPACK uses high-speed switching elements in the main circuit. It may be subjected
to switching noise from these high-speed switching elements if wiring or grounding around the
SERVOPACK is not appropriate. To prevent this, always wire and ground the SERVOPACK
correctly.
The SERVOPACK also has a built-in microprocessor (CPU). Therefore install a noise filter to
protect the microprocessor from external noise.
The diagram below shows an example of wiring for noise control.
• Grounding
P
200 VAC
3.5 mm2
(0.005 in2)
min. ( C a s i n g )
Figure 5.4 Grounding
* When using a noise filter, always observe the wiring instructions given in the next section.
Note 1. Use a wire (preferably a plain stitch copper wire) at least 3.5 mm2 (0.005 in2) thick to ground the casing.
2. Use twisted-pair wires whenever possible for wires indicated by IP .
Noise filter
1 .
2LF
• Operation relay sequence
__ • Signal generator circuit
(provided by user)
J
P 1 L F
•
7777" 2
(Casing ( C a s i n g ) "
(See 2.) ( C a s i n g ) I
3.5 mm2 (0.005 in2) min. wire thickness „ o r 77/r7-
3.5 mm2 (0.005 In2) min.
5 -13
5.7 Application Precautions
O R
S G D B
O S SERVOPACK
O T
O r 2 C N
0 t
1CN 4CN
u p
AVR
mm2 (0.003 In2)
" min.
7 " (Casing)
(Ground plate)
=• G r o u n d : Ground to one point only
(less than 100 ft)
Servomotor
r- - 1
U
(FG
FG
3.5 mm2
(0.005 in2)
min.
3.5 mm2
(0.005 in2)
min.