Appendix 3 EMC Standard
XBC E-Type Main Unit App. 3-2 Ver. 1
ii. Long earthing wires can generate EM noise. Use the shortest possible length to
gr
ound.
b. Attach a ferrite choke to the power wiring to comply with CE specifications.
A3.2 Requirements to Conform with Low-voltage Directive
The low-voltage directive requires each device that operates with the power supply ranging from 50V to
1000VAC and 75V to 1500VDC to satisfy the safety requirements. Cautions and installation and wiring of the
PLC XGB series to conform to the low-voltage directive are described in this section. However, LSIS will not
guarantee that the overall machinery manufactured according to these details conforms to the above regulation.
The method of conformance to the EMC directive and compliance to the EMC Directive must be determined by
the manufacturer of the machinery.
A3.2.1 XGB Series PLC Selection
1. Power and CPU
a. There are dangerous voltages (higher than 42.4V peak) inside the power supply
modules of the AC110/220V rated PLCs. CE mark-compliant models feature enhanc
ed
i
nsulation between the primary and secondary windings.
2. I/O module
a. There are dangerous voltages (higher than 42.4V peak) inside the I/O modules of t
he
A
C110/220V rated I/O modules. CE mark-compliant models feature enhanc
ed
i
nsulation between the primary and secondary windings.
b. I/O modules of DC24V or less rating are out of the low-voltage directive application
r
ange.
3. Special module, Communication module
a. Special and communication modules are DC24V or less in rated voltage, therefore they
are out of the low-voltage directive application range.
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