SIMOVERT Master Drives Communication Board CBD

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Master DrivesCBD05/20/993 Connecting-up3.2 EMC measures3.2.1 Potential bonding3.2 EMC measuresDeviceNet specifications must be followed if the DeviceNet bus is to operate fault-free:3.2.1 Potential bondingPrevent potential differences (e. g. as a result of using different power supplies), between the converters and the busmaster:♦ Use potential bonding cables:• 16 mm 2 Cu for potential bonding cables up to 200 m• 25 mm 2 Cu for potential bonding cables over 200 m♦ Route the potential bonding cables so that there is the smallest possible surface area between the potentialbonding cable and signal cables.♦ Connect potential bonding cables to the ground/protective conductor through the largest possible surface area.3.2.2 Routing cablesPlease observe the following instructions when routing cables:♦ Do not route bus cables (signal cables), directly in parallel with power cables.♦ Signal cables and associated potential bonding cables must have the lowest possible clearance between them andbe as short as possible.♦ Power cables and signal cables should be routed in separate cable ducts.♦ Shields should be connected through a large surface area.Siemens AG 477 759 4070 76 J AA-74 11SIMOVERTMASTERDRIVES Betriebsanleitung/OperatingInstructions
Master DrivesCBD05/20/993 Connecting-up3.3 Bus termination3.3 Bus terminationTo guarantee fault-free operation of the DeviceNet bus, the bus cable must be terminated using bus terminatingresistors at both ends of the trunk as described in the DeviceNet specifications.The resistor requirements are:• 121 ohm• 1% Metal Film• ¼ Watt3.4 Ground connectionGrounding of the DeviceNet bus is described in the DeviceNet specification. The specification follows:“DeviceNet should be grounded at ONE location. Grounding at more then one location may produce ground loops,while not grounding the network will increase sensitivity to ESD and outside noise sources. The single groundinglocation should be at a power tap. Sealed DeviceNet power taps are designed to accommodate grounding.Grounding near the physical center of the network is also desired.”“The trunk drain/shield should be attached to the power supply ground or V with a copper conductor that is eithersolid, stranded, or braided. Use a 1” copper braid or a #8 AWG wire that is less than 3 meters/10 feet in length. Thisshould then be attached to a good earth or building ground (such as an 8 foot stake driven into the ground, attached tobuilding iron or to the cold water plumbing).”“If the network is already grounded, do NOT connect the grounding terminal of the tap or ground of the supply to earth.If more than one supply is on the network, then connect the drain wire/shield at ONE supply only, preferably near thephysical center of the network.”3.5 DeviceNet Power Supply and Power TapPowering of the DeviceNet bus is described in the DeviceNet specification. A DeviceNet power tap should beused to protect the network, The general power supply specification follows:• +24 VDC• Ability to support linear and switching regulators• Tolerance of: +24 VDC +/ 1% and current capability of 016 amps (single and multiple supply applications)• Supply outputs must be isolated from the AC line and chassis3.6 CBD Power RequirementsEach CBD draws a maximum of 35 ma worst case (at 11 VDC) from the DeviceNet power supply.The CBD is technically called an “isolated node with transceiver powered by the network”. The transceiver and half ofthe optocouplers are powered by the DeviceNet network. But the rest of the node is powered by the AC line.12 Siemens AG 477 759 4070 76 J AA-74SIMOVERTMASTERDRIVES Betriebsanleitung/OperatingInstructions
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