Lumel RE72 User Manual

Also see for re72 series: Quick start manual User manual User Manual & Quick Start User Manual & Quick Start Quick start

Lumel RE72 User Manual Manual pdf 10 page image

1010currenttransformer65 +-Fig. 9. Current transformer inputFig. 10. RS-485 Interface87RS-485BA(-)(+)Fig. 11. Supply of 24V transducers4.3. Installation RecommendationsIn order to obtain a full fastness against electromagnetic noise, it isrecommended to observe following principles:- do not supply the controller from the network in the proximityof devices generating high pulse noise and do not apply commonearth circuits,- apply network filters,- wires leading measuring signals should be twisted in pairs,and for resistance sensors in 3-wire connection, twisted of wiresof the same length, cross-section and resistance, and led in a shieldas above,- all shields should be one-side earthed or connected to the protectionwire, the nearest possible to the controller,- apply the general principle, that wires leading different signals shouldbe led at the maximal distance between them ( no less than 30 cm),and the crossing of these groups of wires made at right angle (90º).