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Example of measure against noise for compliance with the EMC directive
CPU
module
Power supply
module
*4
AC power
supply
NF
*2
*1 Ground the cables at a position within 30 cm (11.82 inch) from the module with the cable clamp.
*2 Wire the power supply cable as short as possible using the twisted cable (2 mm
*3 Use the shielded twisted cable (cable length: 30 m (98.43 ft.) or less) for the external input signal cable.
(Manual pulse generator cable (open-collector type): 10 m or less)
*4 Wire the power supply module as short as possible using the cable of approx. 2 mm
terminal.
• Refer to this chapter or "EMC and Low Voltage Directives" of the following manuals for basic wire. We examined RD77MS
by the above example.
MELSEC iQ-R Module Configuration Manual
Safety Guidelines (This manual is included with the base unit.)
• In wiring inside the panel, the power line connected to the power or servo amplifier and the communication cable such as
an expansion cable or a network cable must not be mixed. In the duct, leave 10 cm (3.94 inch) or more between the power
line and the communication cable, and separate using a separator (made of metal), etc. It is required in the same control
panel as well. Mixing the power line and communication cable may cause increase of noise or malfunction due to noise
influence.
Control panel: EC-SCF25-78
(Nitto Kogyo Corporation)
RD77MS
*1
*1
External input signal cable
*3
SSCNETIII cable
: AD75CK cable clamp
Manual pulse generator,
24 V DC power supply for EMI,
External input device,
etc.
Servo amplifier
2
or more).
2
, and ground to the control panel from the FG/LG
5.1 Precautions for Wiring
5
5 WIRING
47
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