Omron MX2 Series User Manual page 126

2 Design
⚫ Measures against noise for compliance with EMC Directive
• Keep the power cable of the inverter and the EMC noise filter wiring as short as possible.
Use a shield braided cable.
• For the shield braided cable, use a tinned copper shielded cable with a shield factor of 85%.
• Be sure to connect the ground cable separately from the shielded cable. Use the ground cable as
thick and short as possible to wire.
• Use shield braided cables for connection between the inverter and the motor. Keep the cables as
short as possible at a length 20 m or less, with the cable shield grounded at each end. Installing a
clamp filter near the inverter output terminals is an effective countermeasure.
• Ground the motor frame, the shield of the motor cable, and the terminal housing adequately.
• The motor terminal housing may not contact with the chassis due to the rubber bushing or the
screw hole for motor ground terminal may be coated. Check the contact performance. If there is
any problem, take measures to enhance contact performance.
• Use shielded cables for wiring to the control circuit terminals and communications lines and
ground the shield of each cable on the inverter side. Grounding the cables at each end may
increase the effect.
• Connect the cable shield directly to a ground plate with a conductive cable clamp. At this time,
keep the shield strip length as short as possible.
• Make the contact area between the EMC noise filter/Inverter and the ground plate as large as
possible to enhance contact performance. At this time, remove the paint etc. from the ground
plate.
• For the control panel door, use a conductive gasket to improve the shielding effect.
• In the same control panel, do not install equipment that generates non-EMC-compliant electro-
magnetic waves.
• Avoid conductor loops that encompass large areas.
• As a measure against harmonic distortion, an AC/DC reactor or harmonic suppression equipment
is required.
• Avoid placing noise-generating cables (such as power cables and motor cables of the inverter) in
parallel with signal cables and allow a clearance of at least 25 cm between them.
If you cannot avoid crossing two types of cables, keep them at right angles to each other.
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Multi-function Compact Inverter 3G3MX2-EV2 User's Manual (I666-E1)