Danfoss VLT Series FC 102 Installation Manual

Also see for VLT AQUA Drive FC 202: Service guide Installation guide Installation guide Operating guide Installation guide

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Danfoss VLT Series FC 102 Installation Manual Manual pdf 10 page image

3.6 TopologyThe PROFINET module features a built-in Ethernet switchwith 2 Ethernet RJ 45/M12 connectors. The moduleenables the connection of several PROFINET options in aline topology as an alternative to a traditional startopology. The 2 ports are equal. Select and use the 2 portsfreely.Star Topology130BC929.10Illustration 3.5 Star TopologyLine TopologyIn many installations, line topology enables simpler cablingand the use of smaller Ethernet switches. The PROFINETinterface supports line topology with its 2 ports and built-in Ethernet switch.When line topology is used, take precautions to avoidtimeout in the PLC when more than 8 frequencyconverters are installed in series. Each frequency converterin the network adds a small delay to the communicationdue to the built-in Ethernet switch. When the update timeis too short, the delay can lead to timeout in the PLC. Setthe update time as shown in Table 3.1. The numbers givenare typical values and can vary from installation to instal-lation.Numbers of frequency convertersconnected in series Minimum update time [ms]<8 28-16 417-32 833-50 16>50 not recommendedTable 3.1 Minimum Update Time130BC930.10Illustration 3.6 Line TopologyNOTICEIn a line topology, activate the built-in switch bypowering all frequency converters, either by mains or a24 V DC option card.NOTICEInstalling frequency converters of different power sizesin a line topology may result in unwanted power-offbehaviour while using controlword timeout (8-02 ControlWord Source to 8-06 Reset Control Word Timeout). It isrecommended to mount the frequency converters withthe longest discharge time first in the line topology. Innormal operation, the larger power size frequencyconverters have a longer discharge time.Ring/Redundant Line Topology130BD803.10Illustration 3.7 Ring/Redundant Line TopologyInstallation Installation Guide8 Danfoss A/S © Rev. 07/2014 All rights reserved. MG90U40233