4 - 18
Chapter 4 Installation, Wiring and Maintenance of the Produc
[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
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 bus connection cable or network cable
must not be mixed. If the cables are installed closely with each other for wiring
reasons, using a separator (made of metal) can make the cables less influenced
by noise.
Mixing the power line and communication cable may cause malfunction due to
noise.
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