Panasonic KW8M User Manual

KW8M Eco-POWER METER (1A/5ACT input type)103.5 RS485 Communication・When using shielded cable for the RS485 transmission line, ground one end.Use a class D dedicated earth for grounding. Do not share a ground with other earth lines. (Fig.1)・Be sure to connect with daisy chain the RS485 transmission line between each unit.Do not use a splitter. (Fig.2)・With a terminal station, RS485 (E) (No.10) and RS485 (-) (No.9) should be shorted.*E terminal is not SG (signal ground) terminal. Do not ground shielded cable.Recommended CableUse the transmission cables shown below for Eco-POWER METER RS485 communication system.Conductor InsulatorCable Size Resistance(at 20℃） Material ThicknessCablediameter Applicable cable1.25 mm 2(AWG16)or moreMax.16.8Ω/km Polyethylene Max.0.5 mmApprox.8.5 mmHITACHIKPEV-S1.25 mm 2×1PBelden Inc. 9860Twisted-pairwith shield 0.5 mm 2(AWG20)or moreMax.33.4Ω/km Polyethylene Max.0.5 mmApprox.7.8 mmHITACHIKPEV-S0.5 mm 2×1PBelden Inc. 9207VCTF0.75 mm 2(AWG18)or moreMax.25.1Ω/km PVC Max.0.6 mmApprox.6.6 mmVCTF0.75 mm 2×2C(JIS)Cable SectionTwisted-pairwith shieldVCTFNotes1) Use shielded type twist cables.2) Use only one type of the transmission cables.2) Do not mix different types of the cables.3) Use twist pair cables under a bad noise environment.(Fig.2)Correct wiring○Incorrect wiring×Terminal Terminalstation stationConductor InsulatorJacketShield JacketConductor Insulator(－)(＋) (－)(＋)Shielded cableTo RS485 deviceShielded cableEco-POWER METERGeneral stationClass D grounding Class D groundingEco-POWER METERTerminal station(Fig.1)