JANUS Engineering Training 0.4.pdf - Grostech.com
JANUS Engineering Training 0.4.pdf - Grostech.com
JANUS Engineering Training 0.4.pdf - Grostech.com
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Comms WiringComms Lines Outside• A 485/422 <strong>com</strong>ms line is only ever grounded at ONE END between nodes• Each node on a segment must share a <strong>com</strong>mon building ground• If a <strong>com</strong>mon ground is not available then Galvanic Isolation should be employedbetween different earth potentials, otherwise <strong>com</strong>ms problems may arise• If cables run externally, Lightning Arrestors should be installed where the cablesenter and exit the building. Galvanic Isolation should then be used between theLightning Arrestor and IDC• Underground cable runs do not require Lightning ArrestorsAlternatively use TCP/IP or Fibre272814
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