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6Safety
6.4.3 EMC measures
There are mainly following items in the EMC measures.
(1) Store into the sealed metal board.
(2) Grounding all the conductor that have floated electrically (makes the impedance low).
(3) Wiring so that the power source wire and signal wire are separated.
(4) Use the shield cable for the cable which wired outside of the metal board.
(5) Install the noise filter.
To suppress the noise emitted out of the board, be careful of the following item.
(1) Ensure grounding of the equipment.
(2) Use the shield cable.
(3) Separate the metal board electrically. Narrows the distance/hole.
The strength of electromagnetic noise emitted to environment is changed a lot by the shielding efficiency
of cable and the distance of metal board, so it should be careful.
6.4.4 Component parts for EMC measures
(1) Ferrite core
The ferrite core is mounted by the plastics case as one. It can attach by the one-touch, without cutting the cable.
This has the effect in the common-mode noise. The measures against the noise are made not influential in the
quality of the signal.
There are the following as an example.
Maker: SEIWA ELECTRIC MFG. Co.,Ltd.
Outside dimension (mm)
Type
A
E04SR401938
61
E04SR301334
39
Maker: TAKACHI ELECTRONICS ENCLOSURE CO., LTD.
Outside dimension (mm)
Type
A
TFT-274015S
43.8
(2) Line noise filter
Type ： FR-BLF （Mitsubishi Electric Corp.）
EMC installation guideline
6-159
Diameter of the
adaptation cable
B
C
D
[max] (mm)
38
19
40
34
13
30
Diameter of the
adaptation cable
B
C
D
[max] (mm)
27.4
20.7
-
φ26.5
19.0
13.0
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