Conformance To Ec Directives; Relay Output Noise Reduction Methods - Omron NSJ CONTROLLERS - 03-2008 Operation Manual

Conformance to EC Directives

6-3 Conformance to EC Directives
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Relay Output Noise Reduction Methods

Countermeasures
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The NSJ Controllers comply with EC Directives. To ensure that the machine
or device in which the NSJ Controller is used complies with EC Directives, the
NSJ Controller must be installed as follows:
1. The NSJ Controller must be installed within a control panel.
2. You must use reinforced insulation or double insulation for the DC power
supplies used for the NSJ Controller, Expansion Racks, and I/O power
supplies. The DC power supply for the NSJ Controller and Expansion
Racks must have an output hold time of 10 ms min.
3. NSJ Controllers also conform to EMI Standard (EN61131-2). Radiated
emission characteristics (10-m regulations) may vary depending on the
configuration of the control panel used, other devices connected to the
control panel, wiring, and other conditions. You must therefore confirm that
the overall machine or equipment complies with EC Directives.
4. This is a class A product. In residential areas it may cause radio interfer-
ence, in which case the user may be required to take adequate measures
to reduce interference.
The NSJ Controllers conforms to the Common Emission Standards
(EN61000-6-4) of the EMC Directives. However, noise generated by relay out-
put switching may not satisfy these Standards. In such a case, a noise filter
must be connected to the load side or other appropriate countermeasures
must be provided external to the NSJ Controller.
Countermeasures taken to satisfy the standards vary depending on the
devices on the load side, wiring, configuration of machines, etc. Following are
examples of countermeasures for reducing the generated noise.
(Refer to EN61000-6-4 for more details.)
Countermeasures are not required if the frequency of load switching for the
whole system with the NSJ Controller included is less than 5 times per
minute.
Countermeasures are required if the frequency of load switching for the whole
system with the NSJ Controller included is more than 5 times per minute.
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