AS-Interface cabling system - Schneider Electric

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Presentation (continued) 0AS-Interfacecabling system 0Setting-up (continued)Cable lengths (continued)Calculating cable lengthsThe total length of cable and wires connected to the AS-Interface + terminals andAS-Interface - terminals of the master must be carefully counted, both inside andoutside the enclosure, including the lengths of tap-offs in cases where AS-Interfacecomponents are not installed directly on the yellow cable using the IDC system.Lengths of tap-off cables must be counted twice. We therefore recommend usingshort tap-off runs and, wherever possible, using products installed directly on theyellow cable via IDC connectors (example: IP 67 interfaces, referencesASI 67FFPppp).2 m2 m2 m0,3 mTotal length of ribbon cableTotal length of round wireTotal length of tap-offsLength of network=40m=Lc=2m=Lf=4.3m=Ld= Lc + Lf + 2 x Ld = 50.60 mCables between sensors/actuators and interface inputsSensors/actuators must be supplied with power directly at the AS-Interface interfaceterminals or connectors. The sensor supply must not be connected to any potential.Maximum lengths are:b Between safety sensors and safety interfaces: 3 m (2 m recommended).b Between standard sensors/actuators and interfaces: 10 m.12
Presentation (continued) 0AS-Interfacecabling system 0Setting-up (continued)Cable routingb Do not route the AS-Interface cable with other cables in the same strand. Inexceptional circumstances, it is permissible to run cables carrying low power signals(for example: wires connected to start/stop buttons) close to the AS-Interface + andAS-Interface - cables.b Do not route the AS-Interface cable close to sources of interference (variatorcables, etc...) including inside the enclosure.b To ensure symmetry, the AS-Interface cable must be laid flat in relation to thesupport on which it is fixed, especially if the support is in metal.v the end of the AS-Interface cable must be protected (never leave the end of thecable open), for example by terminating the line with an IP 67 interface,v in an enclosure, when standard wire is used for cabling AS-Interface + andAS-Interface - lines, these wires must be of the same length and must be laid inparallel. They must be spaced no more than 10 mm apart.Limiting the interference emittedby certain productsIn order to limit the electromagnetic disturbance emitted by products, a number ofrecommendations must be taken into account:b Fit frequency variators with suitable filters.b Use screened cables between the variator and the motor.b Fit inductive loads (coils of contactors, relays, brakes, solenoid valves etc.) withflywheel diodes, varistors or RC circuits.When it is not possible to completely eliminate emitted interference, is it essential toensure that the following distances are maintained.b In the case of an AS-Interface installation including safety products,the AS-Interface cable or the safety input cables must be located at a distancegreater than:v 50 cm from products which have a control circuit with inductive load (relays,contactors, coils, reversing contactors, etc...).v 100 cm from products such as welding machines, power circuits in general,electronic speed regulators, switch mode power supplies.b In the case of an AS-Interface that does not include safety products, theAS-Interface cable or standard sensor/actuator cables must be located as adistance greater than:v 10 cm from products which have a control circuit with inductive load (relays,contactors, coils, reversing contactors, etc...).v 50 cm from products such as welding machines, power circuits in general,electronic speed regulators, switch mode power supplies.In all cases, we recommend that the practical installation guidelines in the SchneiderElectric EMC manual be followed (please consult your Regional Sales Office).13
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AS-Interface cabling system - Schneider Electric

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