dealer certification section 2: building the network physical planning & documentation power...
TRANSCRIPT
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Dealer CertificationDealer Certification
Section 2: Building the NetworkSection 2: Building the Network
Physical Planning & DocumentationPhysical Planning & Documentation
Power Sources & DistributionPower Sources & Distribution
Voltage Drop CalculationsVoltage Drop CalculationsCopyright © 2011 NMEA
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Physical Planning & Documentation:Physical Planning & Documentation:Power Application ExamplePower Application Example
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Determine Device Locations on the vessel
Determine Backbone Path through the vessel– Passes within 6 m of Each Device– Less than 100 m End to End (250 m w/heavy cable)– Backbone Must Not Branch
Determine Power Source and Application Point(s)
Physical Planning & Documentation:Physical Planning & Documentation:Planning the Physical LayoutPlanning the Physical Layout
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Select Cable Type – Either Light (Most Common) , Mid or Heavy– Ensure Total Power Does Not Exceed Cable Rating
Determine Power Source and Application Point(s)(Power Tees)
More than one power application point IS allowed and MAY be needed as network size increases.
Physical Planning & Documentation:Physical Planning & Documentation:Planning the Physical LayoutPlanning the Physical Layout
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Physical Planning & Documentation:Physical Planning & Documentation:Start With a Backbone DiagramStart With a Backbone Diagram
1. The length of each network segment and drop cable; location of tees and terminations
2. The identity and network LEN of each equipment on the network
3. The planned location(s) where power will be supplied to the network
4. The single location where the shield/drain wire will be connected to vessel’s non-current carrying RF ground.
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Physical Planning & Documentation:Physical Planning & Documentation:Start With a Backbone DiagramStart With a Backbone Diagram
A completed network diagram contains all information necessary to complete the voltage drop calculations
Defines all cables, connectors, & devices needed for the complete installation
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Physical Planning & Documentation:Physical Planning & Documentation:Load Equivalency Numbers (LEN)Load Equivalency Numbers (LEN)
Representation of the amount of current a device
uses from the bus All devices have a LEN equivalency number (LEN) The device manufacturer publishes this number
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Physical Planning & Documentation:Physical Planning & Documentation:Load Equivalency Numbers (LEN)Load Equivalency Numbers (LEN)
1 LEN = 50mA , 20 LEN = 1 Amp Maximum LEN a single device can power from bus = 20 LEN is used to determine the voltage drop The higher the LEN, the higher the voltage drop
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POWER INSERTIOIN POINT
Physical Planning & Documentation:Physical Planning & Documentation:Less Than 5 DevicesLess Than 5 Devices
NMEA 2000® Backbone Provides Power to Devices Network Devices Require 9 to 16 VDC Most NMEA 2000 devices get power from the bus
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Physical Planning & Documentation:Physical Planning & Documentation:5 Or More Devices5 Or More Devices
2 meters
0.3 meters 0.3 meters
2 meters
2 meters
POWER
2 meters 6 meters 0.3 meters 0.3 meters 5 meters
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Power Distribution:Power Distribution:Backbone Electrical ConnectionsBackbone Electrical Connections
Power Source Options– Ships Battery Connection (12.5 VDC)– Isolated DC to DC Power Supply (13.8 VDC)– Isolated AC to DC Supply (13.8 VDC)– Multiple Power Supplies (13.8 VDC must be consistent)
Backbone Shield Connection– Only Connected at a Single Point (Single Power Tee)– Connected to the non-current carrying RF Ground
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Power Distribution:Power Distribution:Power Source ConsiderationsPower Source Considerations
Voltage Drop on Backbone Limited by – Voltage Available (Including Distribution Losses)– Voltage Required– Operational Common Mode Voltage Range : ± 2.5 VDC
Power Source Dependability– Minimum Battery Voltage = 11 VDC– Maximum Power Supply LEN Variation = 5%
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Power Distribution:Power Distribution:Multiple Power SourcesMultiple Power Sources
Split Power– Compute Voltage Drop as for a Middle-powered
Backbone
Isolated Power Supplies– Each Power Supply Drives Backbone Segment;
Compute Voltage Drop for Each Supply as End or Mid-powered
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Power Distribution:Power Distribution:End-Powered Backbone ExampleEnd-Powered Backbone Example
POWER 2 meters 5 meters6 meters
0.3 meters2 meters
3 meters
Power is traveling right only
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Power Distribution:Power Distribution:End Power- Single Battery ExampleEnd Power- Single Battery Example
NET-LNET-HNET-SNET-C
Shield / Drain
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Power Distribution:Power Distribution:Middle-Powered Backbone ExampleMiddle-Powered Backbone Example
2 meters
0.3 meters 0.3 meters
2 meters
2 meters
POWER
2 meters 6 meters 0.3 meters 0.3 meters 5 meters
Power is traveling left & right
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Power Distribution:Power Distribution:Isolated DC Power Supply ExampleIsolated DC Power Supply Example
NET-LNET-HNET-SNET-C
Shield / Drain
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Power Distribution:Power Distribution:AC Power Supply ExampleAC Power Supply Example
NET-LNET-HNET-SNET-C
Shield / Drain
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Power Distribution:Power Distribution:Network Node Example (In Device)Network Node Example (In Device)
Isolation between Transceiver and CAN Controller Transceiver is Powered from Network Power
CAN CONTROLLER TRANCEIVER
I/O
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Power Distribution:Power Distribution:Dedicated Power Cable RoutingDedicated Power Cable Routing
Drop Cable without power wires(provided by manufacturer)
Devices powered from backbone
– NMEA 2000 Transceiver circuit is powered by the backbone– Main power for LCD screen etc. is not powered by the backbone
Dedicated power (separate from backbone)
Device is more than 20 LEN
Data & power for NMEA 2000Transceiver ONLY
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Multiple power T’s are needed when voltage Multiple power T’s are needed when voltage drop calculations exceed limits.drop calculations exceed limits.
Additional Power TeeOnly connected to the RightPower
Power Distribution:Power Distribution:Larger NetworksLarger Networks
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Power Distribution:Power Distribution:Multiple Power SuppliesMultiple Power Supplies
– Shield/drain wires (grey) are all tied together and only bonded to RF grounding at one power insertion point
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Heavy cable backboneHeavy Tees with Light / Mid drop connectionAllows for drop cable to connect into all devices
Power Distribution:Power Distribution:Larger NetworksLarger Networks
Light cable drop connection
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Voltage Drop Calculations:Voltage Drop Calculations:Battery & Power Supply Battery & Power Supply
Battery Powered Distribution Loss Budget
Minimum Battery Voltage 11.00 VDC
3% Loss at Insertion - 0.33 VDC
Backbone Distribution Loss - 1.17 VDC
Minimum Voltage at Device 9.50 VDC
Power Supply Powered Distribution Loss Budget
Nominal Power Supply Voltage 13.80 VDC
5% Output Variation - 0.75 VDC
Backbone Distribution Loss - 3.55 VDC
Minimum Voltage at Device 9.50 VDC
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Voltage Drop Calculations:Voltage Drop Calculations:Why Do We Need Them?Why Do We Need Them?
Needed to ensure that all devices on the network are getting adequate power.
Devices furthest from the power insertion point will get less voltage than the closest device.
More than one power insertion point (Power Tee(s)) may be needed to feed all devices.
Voltage drop calculations help us determine this.
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Voltage Drop Calculations:Voltage Drop Calculations:Calculating the Voltage DropCalculating the Voltage Drop
VOLTAGE DROP CALCULATION is Ohms Law; E= I x R E = Voltage Drop (VD)I = Total Network LEN (NL)R = Backbone Length (BL) in Meters (one way)
VD=.1 x NL x BL x Cable Resistance
– Cable Resistance Is in Ohms (Ω) per Meter– Light Cable = .057 Ω– Mid Cable = .015 Ω– Heavy Cable = .012 Ω
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Voltage Drop Calculations:Voltage Drop Calculations:ExampleExample
Network LEN
Network Backbone Length
Cable Resistance-Light
Voltage Drop Estimate
13
14.3
.057 per meter
1.06 volts
E= I x R ( Ohms Law)E = voltage drop (VD)I = total network LEN (NL)R = backbone length in meters (one way) (BL)
VD=.1 x NL x BL x .0571.06= .1 x 13 x 14.3 x .057
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Voltage Drop Calculations:Voltage Drop Calculations:Calculator Keystrokes- EXAMPLECalculator Keystrokes- EXAMPLE
NL (LEN) = 7 BL (Length) = 5.0 Cable Type= Light (.057 Ω / m)
Calculator Keystrokes are…
.1 x 7 x 5 x .057 = 0.1995 Round up at second decimal place → .20
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Voltage Drop Calculations:Voltage Drop Calculations:Calculator Keystrokes- EXAMPLECalculator Keystrokes- EXAMPLE
NL (LEN)=3 BL (Length) = 4.2 Cable Type= Light (.057 Ω / m)
Calculator Keystrokes are…
.1 x 3 x 4.2 x .057 = 0.07182 Round up at second decimal place → 0.07
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Voltage Drop Calculations:Voltage Drop Calculations:Calculator Keystrokes- EXAMPLECalculator Keystrokes- EXAMPLE
NL (LEN)=12 BL (Length) = 9.8 Cable Type= Light (.057 Ω / m)
Calculator Keystrokes are…
.1 x 12 x 9.8 x .057 = 0.67032 Round up at second decimal place → 0.67
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Voltage Drop Calculations:Voltage Drop Calculations:Calculator Keystrokes- EXAMPLECalculator Keystrokes- EXAMPLE
NL (LEN) =15 BL (Length) = 20.3 Cable Type= Heavy (.012 Ω /m) Calculator Keystrokes are…
.1 x 15 x 20.3 x .012 = 0.3654 Round up at second decimal place → 0.37
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Voltage Drop Calculations:Voltage Drop Calculations:Calculator Keystrokes- EXAMPLECalculator Keystrokes- EXAMPLE
NL (LEN)=19 BL (Length) = 28 Cable Type= Mid (.015 Ω / m) Calculator Keystrokes are…
.1 x 19 x 28 x .015 = 0.798 Round up at second decimal place → 0.79
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Voltage Drop Calculations:Voltage Drop Calculations:When Do We Calculate Segments?When Do We Calculate Segments?
When VD exceeds 1.17 VDC using a ship battery powered network
When VD exceeds 3.55 VDC using a regulated 13.8 VDC power supply
Battery Powered Distribution Loss Budget
Minimum Battery Voltage 11.00 VDC
3% Loss at Insertion - 0.33 VDC
Backbone Distribution Loss - 1.17 VDC
Minimum Voltage at Device 9.50 VDC
Power Supply Powered Distribution Loss Budget
Nominal Power Supply Voltage 13.80 VDC
5% Output Variation - 0.75 VDC
Backbone Distribution Loss - 3.55 VDC
Minimum Voltage at Device 9.50 VDC
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Enter devices starting at the device closest to the power insertion point.
Enter segment lengths starting with the segment between the power insertion point and the first device.
Always use the last drop length as part of the total backbone length calculation
Compute currents. Compute voltage drop in each segment for each
device. Add the voltage drops in the column.
Voltage Drop Calculations:Voltage Drop Calculations:Calculating the SegmentsCalculating the Segments
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Voltage Drop Calculations:Voltage Drop Calculations:Segments on the NetworkSegments on the Network
Calculate segments left of power
Calculate segments right of power
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Voltage Drop Calculations:Voltage Drop Calculations:Left Side of Power TeeLeft Side of Power Tee
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Voltage Drop Calculations:Voltage Drop Calculations:Left Side of Power TeeLeft Side of Power Tee
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Voltage Drop Calculations:Voltage Drop Calculations:Right Side of Power TeeRight Side of Power Tee
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Voltage Drop Calculations:Voltage Drop Calculations:Right Side of Power TeeRight Side of Power Tee
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NEXT: Section 3NEXT: Section 3
Connecting to Other Data Sources and NetworksConnecting to Other Data Sources and Networks
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Advanced Setup, Certification, TroubleshootingAdvanced Setup, Certification, Troubleshooting
Copyright © 2011 NMEA