AN-263 MC464 EMC protection
Contents
1. screen of the encoder cable where it enters the connector cover Do not make a pig tail connection from the screen to the plug cover When plugging the D type into the MC464 use the jack screws to firmly attach the D type plug to the socket on the MC464 or its axis module Both ends of the encoder cable s screen must be connected using a 360 degree contact and not a pig tail connection The OV must be connected separately from the screen Make sure that encoder cables are specified with one extra wire to carry the OV Name GD Cat HW Page 1 of 2 MOTIONI TECHNOLOGY 3 Shield Cable to MC464 The MC464 must either be mounted using the panel mounting clips provided or if DIN rail mounted it must have a braided shield wire connected between the metal MC464 chassis and the metal earthed panel The shield strap must be as short as practically possible Use a flat braided conductor minimum cross section 4mm x 1mm Connect to the earthed metal panel as close to the MC464 as possible Do not use circular cross section wire Do not run the conductor to a central star point 1 Fix a Shield cable to the upper tapped hole in the MC464 Use a M3 screw of length 10mm max 2 Fix the other end of this cable to the back plate chassis 4 Connection to Flexaxis Module Where the P874 and P879 modules are used Trio advise that an additional shield strap may be required Use a flat braid minimum cross section 4mm x 1mm2. Do not use circular cross section wire Do not run the conductor to a central star point Fix the Shield cable to the D Type socket fixing screw Trap the crimp eye between the D type plug and the hex socket that it screws into Make sure that the D Type still makes good contact with the socket The eye must not be too thick less than 1mm Fix the other end of the shield cable to the back plate chassis Make sure that the back plate is earthed Make the shield cables out of flat braid Make the shield wires as short as possible If there are 2 or 3 P874s P879s in the system fix a shield cable to each one Name GD Cat HW Page 2 of 2
3. Trio Motion Technology Ltd 1000 Gamma Drive B1602 Tomson Centre Shannon Way Tewkesbury Suite 206 188 Zhang Yang Rd Gloucestershire GL20 8ND Pittsburgh PA 15238 Pudong New Area Shanghai United Kingdom United States of America Postal code 200122 Tel 44 0 1684 292 333 Tel 1 412 968 9744 CHINA SATSANG Ge Se ae Fax 44 0 1684 297 929 Fax 1 412 968 9746 Tel Fax 86 21 587 97659 AN 263 Doc No Version 1 0 Date 09 December 2010 __ Subject Additional EMC protection for the MC464 O OO APPLICATION NOTE 1 Introduction In some environments it is necessary to add additional EMC protection to improve the noise immunity of the MC464 This document details some things which can be done to make the MC464 more immune to incoming electrical noise and interference Some details repeat what is already in chapter 3 of the MC464 user manual 2 Shielding Encoder Cables Electrical noise is often carried on the encoder cables between the servo drives and the MC464 It is vital to terminate the screen correctly so that noise is not carried into the MC464 via the encoder signal wires Page 3 9 of the MC464 user manual shows how to terminate encoder cables The information is repeated here 2 1 Cable Shields All encoder cables must be terminated in the correct D type plug either 9 way or 15 way as required For best EMC performance use a metal or metalised plastic cover for the D type connector Clamp the
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