Mitsubishi Electric FX3U-ENET User Manual page 13

Caution to conform with EC Directives
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• Installation in Enclosure
Programmable logic controllers are open-type devices that must be installed and
used within conductive control cabinets. Please use the programmable logic
controller while installed within a conductive shielded control cabinet. Please secure
the cabinet door to the control cabinet (for conduction).
Installation within a control cabinet greatly affects the safety of the system and aids
in shielding noise from the programmable logic controller.
• Control cabinet
- The control cabinet must be conductive.
- Ground the control cabinet with the thickest possible grounding cable.
- To ensure that there is electric contact between the control cabinet and its door,
connect the cabinet and its doors with thick wires.
- In order to suppress the leakage of radio waves, the control cabinet structure must
have minimal openings. Also, wrap the cable holes with a shielding cover or other
shielding devices.
- The gap between the control cabinet and its door must be as small as possible by
attaching EMI gaskets between them.
Wires*1
*1. These wires are used to improve the conductivity between the door and control
cabinet.
• Notes for compliance with EN61131-2:2007
General notes on the use of the power supply cable.
- The FX -ENET unit requires that the cable used for power supply is 30m or less.
3U
- When the cable used for power supply exceeds 30m, a noise filter (Ex. TDK-
Lambda MBS1205-22 or similar) should be placed on the 24V DC power cabling
as close (within 500mm) to the FX
following figure.
FX -ENET
3U
500mm or less
24V DC
Shielding cover
Shielded cable
EMI gasket
-ENET termination points as possible, refer to
3U
Exceeding 30m
Noise
Filter
24V DC power
supply
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