YASKAWA CIMR-E7 series Technical Manual

Diagnostics 3-9Cables and WiringStandard network wiring practices should be followed.! Do not route any network wires close to high voltage or high current wires. It is recommended that network wiring be in its ownconduit or trough. It may, however, be routed with low voltage DC wires.! If the network must cross high voltage or current wires, the network must cross perpendicular to the high voltage or current wires.! If a clean, noise free ground cannot be found locally to the device, route a ground wire of sufficient size to each device. Remember toprovide a single point ground to avoid ground loops.! Follow all local electrical codes.# Network CablesChoose the correct cable for the application and network configuration. For more information on cables and cabling refer to ìJunction Box andWiring Guidelines for Twisted Pair LONW ORKS Networks” Echelon engineering bulletin #005-0023-01. It may be downloaded fromwww.echelon.com.Table 3.3 BUS Topology SpecificationsCable Maximum bus length(Meters)Belden 85102 2700Belden 8471 2700Level IV, 22AWG 1400JY(St) Y 2x2x0.8 900TIA Category 5 900Note: A doubly-terminated bus may have stubs of up to 3 meters from the bus to each device.Table 3.4 Free Topology SpecificationsCable Maximum device-to-device distance (Meters) Maximum total Wire length(Meters)Belden 85102 500 500Belden 8471 400 500Level IV, 22AWG 400 500JY(St) Y 2x2x0.8 320 500TIA Category 5 250 450# Shield GroundsShields can be a prime source of noise in any network. The general rule is to ground the shield at the signal source. Depending on the type ofnoise and the quality of the ground plane, it may be advisable to ground the shield at each device and/or at both ends of the network segment. Ifthere is noise on the network or intermittent short term communication failures, removing the shield from the device connection is usually oneof the first methods used restore communications stability. Also, if there is a disparity in the ground planes between devices, it is preferable todisconnect the shield from the device connection. The shield must still remain contiguous even if removed from a device connector.Table 3.5 – Shield GourndDevice DescriptionR 470kΩ, 5%, ºWC1 0.1μF, 10%, Metalized polyester, ≥100VFigure 3.4 ñ L ONWORKS Shield ground

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