Mitsubishi Electric MELSEC iQ-F FX6U Hardware User Manual page 185

Caution for compliance with EC Directive
■Installation in enclosure
FX5U CPU modules are open-type devices that must be installed and used within shielded conductive control boxes.
Please use the PLCs while installed in conductive shielded control boxes. Please secure the control box lid to the control box
(for conduction). Installation within a control box greatly improves the safety of the system and aids in shielding noise from the
PLC.
■Caution for when analog products are used
It is recommended to perform the following when precision of measuring and control is required.
As analog devices are sensitive by nature, their use should be considered carefully. For users of proprietary cables (dedicated
for sensors or actuators), these users should follow those manufacturers' installation requirements.
Mitsubishi Electric recommends that shielded cables be used. If no other EMC protection is provided, users may experience
temporary loss of accuracy between +10%/-10% in very heavy industrial areas.
However, Mitsubishi Electric suggests that if adequate EMC precautions are followed with general good EMC practice for the
user's complete control system, users should expect normal errors as specified in this manual.
• Sensitive analog cables should not be laid in the same trunking or cable conduit as high voltage cabling. Where possible,
users should run analog cables separately.
• Good cable shielding should be used. When terminating the shield at Earth - ensure that no earth loops are accidentally
created.
• When reading analog values, EMC induced errors can be smoothed out by averaging the readings. This can be achieved
either through functions on the analog devices or through a user's program in the FX5U CPU module.
Perform the following when using the analog expansion adapter:
• Installation in Enclosure
Programmable controllers are open-type devices that must be installed and used within conductive control cabinets.
Please use the programmable controller while installed within a conductive shielded control cabinet. Installation within a
control cabinet greatly affects the safety of the system and aids in shielding noise from the programmable 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.
*1 These wires are used to improve the conductivity between the door and control cabinet.
• Cables
- Make sure to use shielded cables as cables pulled out of the control cabinet.
- Connect the shield such as shielded cables and shielding covers to the grounded control cabinet.
• It is possible that the accuracy temporarily fluctuates within ±10 %.
Perform the following when using the FX5-4AD-ADP:
• Set the number of times of winding to "2 turns" within approximately 200 mm from terminal block of the analog cable on the
FX5-4AD-ADP side, and attach a ferrite core. (Ferrite core used in our test: E04SR401938 manufactured by SEIWA
ELECTRIC MFG. CO., LTD.)
Shielding cover
Shielded cable
EMI gasket
Wires *1
APPX
183
Appendix 2 Standards
A