APPX
Appendix 4 EMC and Low Voltage Directives
251
A
■Noise filter (power supply line filter)
A noise filter is a component which has an effect on conducted noise. Attaching the filter can suppress more noise. (The noise
filter has the effect of reducing conducted noise of 10MHz or less.)
Connect a noise filter to the external power supply of the I/O module. Use a noise filter with the damping characteristics
equivalent to those of RSEN-2006 (manufactured by TDK-Lambda Corporation). Note that a noise filter is not required if the
module is used in Zone A defined in EN61131-2.
The precautions for attaching a noise filter are described below.
• Do not bundle the cables on the input side and output side of the noise filter. If bundled, the output side noise will be
induced into the input side cables from which the noise was filtered.
• Ground the noise filter grounding terminal to the control panel with the shortest cable possible (approx. 10cm).
• Problem example
Noise is induced when the input and output cables are bundled.
• Example of improvement
Install the input and output cables separately.
Filter
Induction
Input side (power supply side)
Output side (device side)
Filter
Input side (power supply side)
Output side (device side)
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