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Chapter 4 Installation, Wiring and Maintenance of the Product
[3] Example of measure against noise for compliance with the EMC
directive.
5)
Power supply wiring
QD77MS
SSCNET cable
3)
1)
5)
4)
24VDC
power supply
AC power
supply
2)
: AD75CK cable clamp
1) Ground the cables at a position within 30cm (11.82inch) from the module with the cable clamp, etc.
2) Wire the power supply cable as short as possible using the twisted cable (2mm
2
or more).
3) Use the shielded twisted cable (cable length: 30m (98.43ft.) or less) for each I/O signal cable.
4) Wire the cable connected to secondary side of 24VDC power supply module as short as possible.
5) Wire the power supply and 24VDC power supply as short as possible using the cable of approx. 2mm
2
, and ground to
the control
p
anel.
Q62P POWER
INPUT
100-240VAC
50/60Hz 105VA
OUTPUT 5VDC 3A/24VDC 0.6A
N
L
INPUT
100-240VAC
(FG)
(LG)
L
ERR.
+-
24VDC
0.5A
24G
+24V
5)
2)
NF
Control panel: EC-SCF25-78
(Nitto Kogyo Corporation)
Power
supply
PLC CPU
(1) Refer to this chapter or "EMC and Low Voltage Directives" of "QCPU User's
Manual (Hardware Design, Maintenance and Inspection)" for basic wire. We
examined QD77MS by the above example.
(2) 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 10cm (3.94inch) 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.