YOKOGAWA FA-M3V e-RT3 Plus, Hardware Manual

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A3-42
IM 34M06C11-01E
(4) Considerations on Cable Routing
Signal cables that are connected to the FA-M3 carry harmonic components. The signal
cable acts like an antenna and emits these harmonic components as noise to the
external space and at the same time receives the noise from the external space.
Therefore, it is necessary to use shielded signal cables.
The EMC conformance test of the FA-M3 is conducted using shielded cables and FG
clamps.
The considerations that should be observed during cable routing are summarized below.
Figure A3.38 illustrates this graphically.
- Of the signal cables connected to this equipment, those that lead out of the panel
enclosure should be shielded and the shield at both ends of the cable should be
grounded. 10BASE-T and 100BASE-TX cable sections that lead out of the panel
enclosure (say, to connect to a HUB) should be shielded.
Item Manufacturer Product
Shielded twisted cable Fuji Cable Industries, Inc. FKEV series
Shielded flat cable
Oki Cable, Inc.
SFX-S (**)-7/0.127
3030-SV series
Daichi Electrical Materials, Inc. FDS series
Shielded 10BASE-T cable
Shielded 100BASE-TX cable
Allied Telsis, Inc. Category V shielded cable
Sanwa Supply, Inc. STP cable
Hitachi Cable, Inc.
HSTP5 4P
(without connector)
- Remove part of the covering on a shielded cable to expose the shield and ground it
to the metal plate of the panel enclosure by an FG clamp. When connected to the
metal plate in a pig-tail way using a drain wire, it cannot ensure low impedance
against harmonic noise and cannot provide sufficient grounding effect (noise shield
effect).
Item Manufacturer Product
FG clamp Kitagawa Industries, Inc. FGC series
- Power supply cables of power supply modules (F3PU30-0S and F3PU36-0S) and
YHLS Slave Units (TAH Series) should be fitted with ferrite cores to prevent
interference emission.
Item Manufacturer Product
Ferrite core
Kitagawa Industries, Inc. RFC series
TDK, Inc. ZCAT series
NEC Tokin, Inc. ESD-SR series