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Section 2 Transmission Media and Components

Thick Cable

9ARD000015-600

Table 13

lists the electric current capability based on the network length.

Figure 7

shows the electric current capability on the DeviceNet Power Bus.

Table 13. Electric Current Capability for Thick Cables based on Network Length

Network

Length in

Meters

(feet)

(82)

(164)

100

(328)

150

(492)

200

(656)

250

(820)

300

(984)

350

(1148)

400

(1312)

450

(1476)

500

(1640)

Maximum

Electric
Current

(amps)

8.00 8.00

5.42

2.93

2.01

1.53

1.23

1.03

0.89

0.78

0.69

0.63

Figure 7. Electric Current Capability on DeviceNet Power Bus

Содержание AC 800M

Страница 1: ...Power and productivity for a better worldTM AC 800M EtherNet IP DeviceNet Installation System Version 6 0 ...

Страница 2: ......

Страница 3: ...AC 800M EtherNet IP DeviceNet Installation System Version 6 0 ...

Страница 4: ...B assumes no responsibility for any errors that may appear in this document In no event shall ABB be liable for direct indirect special incidental or consequential damages of any nature or kind arising from the use of this document nor shall ABB be liable for incidental or consequential damages arising from use of any software or hard ware described in this document This document and parts thereof...

Страница 5: ...tion Overview 11 Physical Layer and Media Features 12 Physical Signaling 13 Physical Layer 14 Physical Layer Requirements 15 General Physical Layer Requirements 16 Transmitter Requirements 17 Receiver Requirements 17 Section 2 Transmission Media and Components Topology 19 Power Supply Considerations 20 Network Grounding 20 Cable Types 21 Thick Cable 22 Thin Cable 28 Flat Cable 34 Flat Cable II 40 ...

Страница 6: ...Diode Specifications 57 DC DC Converter 57 Section 3 Installation Cable Planning 59 Network Wiring 59 Cable Color Code 62 Grounding and Isolation 62 Configuring Network Power 63 Defining Power Configuration 64 Quick Start 65 Primary Network Configuration 66 Load Limit 71 System Tolerance 72 Avoiding Errors 72 Power Supply Options 73 Section 4 Troubleshooting Check the Power 76 Check the Wiring 76 ...

Страница 7: ...ons How to Use this User Manual Section 1 Introduction gives a brief overview of the DeviceNet protocol technical terms and transmission technologies Any security measures described in this document for example for user access password security network security firewalls virus protection etc represent possible steps that a user of an 800xA System may want to consider based on a risk assessment for...

Страница 8: ...resentation of material when entering text key sequences prompts messages menu items screen elements etc Warning Caution Information and Tip Icons This publication includes Warning Caution and Information where appropriate to point out safety related or other important information It also includes Tip to point out useful hints to the reader The corresponding symbols should be interpreted as follow...

Страница 9: ...rent from commonly accepted industry standard definitions and definitions given in standard dictionaries such as Webster s Dictionary of Computer Terms Tip icon indicates advice on for example how to design your project or how to use a certain function Term Acronym Description AC 800M ABB Controller 800M series general purpose process controller series by ABB CIP Common Industrial Protocol Connect...

Страница 10: ... accepted standards provides the functionality required to support both information data exchange as well as control applications MAC ID The Media Access Controller Identifier MAC ID is an identification value assigned to each node on the DeviceNet Network This value distinguishes a node with all other nodes on the same link Node Device A connection to a link that requires a unique MAC ID Power Ta...

Страница 11: ...ces such as sensors and actuators with high level devices such as controllers DeviceNet is based on the Common Industrial Protocol CIP It shares all the common aspects of CIP with adaptations to fit DeviceNet message frame size Figure 1 shows an example of typical DeviceNet network Figure 1 DeviceNet Communication Link ...

Страница 12: ...p line or trunk line Supports drop lines upto 6 m 20 ft Supports up to 64 nodes Node removal without severing the network Ability to support both isolated and nonisolated Physical Layers simultaneously Supports sealed media Protection from wiring errors DeviceNet and Ethernet IP share a common upper layer protocol called Common Industrial Protocol CIP ABB s implementation leverages on this commona...

Страница 13: ... the bus as with DeviceNet the dominant level would be represented by a logical 0 and the recessive level by a logical 1 Physical states for example electrical voltage that represent the logical levels are not given in the CAN specification The specification used for these levels is given in the ISO 11898 standard For a node disconnected from the bus the recessive high impedance levels for CAN_L a...

Страница 14: ...consists of the transceiver connector mis wiring protection circuitry regulator and optional optical isolation Figure 4 shows the block diagram of the Physical Layer In this section the transceiver mis wiring protection MWP and optional isolation are explained For more information on connectors refer to Connectors on page 46 For more information on regulators refer to Power Supply on page 54 Figur...

Страница 15: ...he usage of a typical integrated transceiver in a DeviceNet product All transceivers are not the same Ensure that the transceiver allows the device to meet the following specification for the DeviceNet physical layer General Physical Layer Requirements Transmitter Requirements Receiver Requirements Figure 4 Physical Layer Block Diagram ...

Страница 16: ...LO 1 This specification is intended only to prevent large loops which can contribute to signal interference Meeting this requirement does not imply meeting any particular safety requirement The vendor is responsible to determine applicable safety standards and assuring compliance to those standards 500 Volt DC test voltage maximum electric current flow 1 milliamp optional opto isolators on transce...

Страница 17: ...inal by an amount equal to the voltage drop on the Schottky diode The maximum voltage should not exceed 0 6 V Maximum Recessive Bus voltage CAN_H and CAN_L 3 0 Volts 1 Transmitter delay 120 ns maximum opto 40 xcvr 80 Output short circuit protection internally limited Table 3 Receiver Specifications Receiver Characteristics Specifications Differential Input Voltage Dominant 0 95 Volts minimum Diffe...

Страница 18: ...Receiver Requirements Section 1 Introduction 18 9ARD000015 600 ...

Страница 19: ...Drop lines upto 6 m 20 feet each are permitted for attaching nodes to the DeviceNet network Branching structures are allowed in the DeviceNet only on the drop line For more information about the power delivery capability on the trunk line and drop line refer to Defining Power Configuration on page 64 Figure 5 shows the DeviceNet media technology Figure 5 DeviceNet Media Technology ...

Страница 20: ...m the tap on the trunk line to each of the transceivers of the nodes on the drop line This distance includes any dropline cable which might be permanently attached to the device The total amount of drop line allowable on the network depends upon the data rate When determining the number and length of drop lines refer to the cable profile under Cable Types on page 21 Power Supply Considerations Net...

Страница 21: ... at one supply only preferably near the physical center of the network Cable Types The following data consists of the specifications for different cable types Data Pair Specifications Power Pair Specifications General Specifications Topology Physical Configuration Available Bus Electric Current Grounding should always be done according to Federal State and Local regulations The specification lists...

Страница 22: ...pecifications of Thick cable and their corresponding table numbers Figure 6 Thick Cable Physical Configuration Table 4 Specifications for Thick Cable and their Corresponding Table Numbers Characteristics Table Number Data Pair Specification Physical Table 5 Electrical Table 6 DC Power Specification Physical Table 7 Electrical Table 8 General Specification Physical Table 9 ...

Страница 23: ...lors Light Blue White Pair Twist ft 3 approximately Tape shield over pair 2 mil 1 mil Al Mylar Al side out w shorting fold pull on applied Table 6 Electrical Characteristics of Data Pair Specification for Thick Cables Electrical Characteristics Specification Impedance 120 Ohms 10 at 1 MHz Propagation delay 1 36 nSec ft maximum Capacitance between conductors 12 pF ft at 1 kHz nominal Capacitive unb...

Страница 24: ...15 Copper minimum 19 strands minimum individually tinned Insulation diameter 0 098 inches nominal Colors Red Black pair Twist ft 3 approximately Tape shield over pair 1 0 mil 1 mil Al Mylar Al side out w shorting fold pull on applied Table 8 Electrical Characteristic of DC Power Specification for Thick Cables Electrical Characteristic Specification DCR 20 C 68 F 3 6 Ohms 1000 ft maximum Table 6 El...

Страница 25: ... coverage 0 12 mm 36 AWG tinned Cu braid minimum individually tinned Drain wire 18 Copper minimum 19 Strands minimum individually tinned Outside diameter 0 410 inches minimum to 0 490 inches maximum Roundness Radius delta to be within 15 of 0 5 O D Jacket marking Vendor Name Part and additional markings Table 10 General Specification for Electrical Characteristic of Thick Cables Electrical Charact...

Страница 26: ...l force 15 cycles per minute Tic Toc or C track method Bend Radius 20 x diameter installation 7 x diameter fixed Operating ambient temperature 20 C 60 C 8 amps de rate electric current linearly to zero 80 C Storage temperature 40 C 85 C Pull tension 190 lbs maximum Connector Compatibility Mini Open Topology Compatibility Trunk Drop Table 12 Thick Cable Topology Data Rate Max Cable Distance Trunk E...

Страница 27: ...capability on the DeviceNet Power Bus Table 13 Electric Current Capability for Thick Cables based on Network Length Network Length in Meters feet 0 25 82 50 164 100 328 150 492 200 656 250 820 300 984 350 1148 400 1312 450 1476 500 1640 Maximum Electric Current amps 8 00 8 00 5 42 2 93 2 01 1 53 1 23 1 03 0 89 0 78 0 69 0 63 Figure 7 Electric Current Capability on DeviceNet Power Bus ...

Страница 28: ...ch tap has two contacts in series The Cable DCR is determined using an ambient of 80 C and temperature coefficient of 0 00393 per C Thin Cable Figure 8 shows the physical configuration of Thin cable Table 14 provides the various specifications of Thin cable and their corresponding table numbers Figure 8 Thin Cable Physical Configuration Table 14 Specifications of Thin Cable and their Corresponding...

Страница 29: ...eristics of Data Pair Specification for Thin Cables Physical Characteristics Specification Conductor pair Size 24 Copper minimum 19 strands minimum individually tinned Insulation diameter 0 077 inches nominal Colors Light Blue White Pair Twist ft 5 approximately Tape shield over pair 1 mil 1 mil Al Mylar Al side out w shorting fold pull on applied Table 14 Specifications of Thin Cable and their Co...

Страница 30: ...n 0 29 db 100 ft 125 kHz maximum 0 50 db 100 ft 500 kHz maximum 0 70 db 100 ft 1 00 MHz maximum Table 17 Physical Characteristics of DC Power Specification for Thin Cables Physical Characteristics Specification Conductor pair Size 22 Copper minimum 19 strands minimum individually tinned Insulation diameter 0 055 inches nominal Colors Red Black pair Twist ft 5 approximately Tape shield over pair 1 ...

Страница 31: ... 240 inches minimum to 0 280 inches maximum Roundness Delta to be within 20 of 0 5 O D Jacket marking Vendor Name Part and additional markings Table 20 Electrical Characteristic of General Specification for Thin Cables Electrical Characteristic Specification DCR braid tape drain 3 2 Ohms 1000 ft nominal 20 C Table 21 Environmental Characteristics of General Specification for Thin Cables Applicable...

Страница 32: ...85 C Pull tension 65 lbs maximum Connector Compatibility Mini Micro Open Topology Compatibility Trunk Drop Table 22 Thin Cable Topology Data Rate Max Cable Distance Trunk Exchange Thick Cable Cumulative Drop Maximum Drop 125 kb 100 m 328 ft 5 0 156 m 512 ft 6 m 20 ft 250 kb 100 m 328 ft 2 5 78 m 256 ft 6 m 20 ft 500 kb 100 m 328 ft 1 0 39 m 128 ft 6 m 20 ft Table 21 Environmental Characteristics o...

Страница 33: ...eviceNet Power Bus Table 23 Electric Current Capability of Thin Cables based on Network Length Network Length in Meters feet 0 10 33 20 66 30 98 40 131 50 164 60 197 70 230 80 262 90 295 100 328 Maximum Electric Current amps 3 00 3 00 3 00 2 06 1 57 1 26 1 06 0 91 0 80 0 71 0 64 Figure 9 Electric Current Capability on DeviceNet Power Bus Maximum Current Capability amps Length of Network in meters ...

Страница 34: ...ontact DCR Number of Contacts Where Cable DCR 0 0216 ohms ft Contact DCR 0 001 ohms and Number of Contacts 128 because each taps has two contacts in series The Cable DCR is determined using an ambient of 80 C and temperature coefficient of 0 00393 per C Flat Cable Figure 10 shows the physical configuration of Flat cable Figure 10 Flat Cable Physical Configuration ...

Страница 35: ...fication Physical Table 25 Electrical Table 26 DC Power Specification Physical Table 27 Electrical Table 28 General Specification Physical Table 29 Electrical Table 30 Environmental Table 31 Table 25 Physical Characteristics of Data Pair Specification for Flat Cables Physical Characteristics Specification Conductor pair Size 16 Copper minimum 19 strands minimum individually tinned Insulation diame...

Страница 36: ... A Capacitive unbalance 1 2 pF ft at 500 kHz nominal ASTMD4566 94 DCR 20 C 4 9 ohms 1000 ft maximum Attenuation 0 13 db 100 ft 125 kHz maximum 0 25 db 100 ft 250 kHz maximum 0 40 db 100 ft 500 KHz maximum Table 27 Physical Characteristics of DC Power Specification for Flat Cables Physical Characteristics Specification Conductor pair Size 16 Copper minimum 19 strands minimum individually tinned Ins...

Страница 37: ...raid shield N A Drain wire N A Outside diameter N A Roundness N A Jacket marking Vendor Name Part and additional markings Table 30 Electrical Characteristic of General Specification for Flat Cables Electrical Characteristic Specification DCR braid tape drain N A Table 31 Environmental Characteristics of General Specification for Flat Cables Applicable Environmental Characteristics Specification Ag...

Страница 38: ...ension 90 lbs maximum Durometer 95 Shore A maximum Connector Compatibility Flat Topology Compatibility Trunk Table 32 Flat Cable Topology Data Rate Max Cable Distance Trunk Exchange Thick Cable Cumulative Drop Maximum Drop 125 kb 420 m 1378 ft N A 156 m 512 ft 6 m 20 ft 250 kb 200 m 656 ft N A 78 m 256 ft 6 m 20 ft 500 kb 75 m 246 ft N A 39 m 128 ft 6 m 20 ft Table 31 Environmental Characteristics...

Страница 39: ...r Bus Table 33 Electric Current Capability Based of Flat Cable on Network Length Network Length in Meters feet 0 12 5 41 25 82 50 164 100 328 150 492 200 656 250 820 300 984 350 1148 400 1312 420 1378 Maximum Electric Current in amps 8 00 8 00 8 00 5 65 2 86 1 91 1 44 1 15 0 96 0 82 0 72 0 69 Figure 11 Electric Current Capability on DeviceNet Power Bus Maximum Current Capability amps Length of Net...

Страница 40: ...tact DCR in series The Cable DCR is as specified at an ambient of 20 C Flat Cable II Figure 12 shows the physical configuration of Flat Cable II Table 34 provides the various specifications of Flat cable II and their corresponding table numbers Figure 12 Flat Cable II Physical Configuration Table 34 Specifications and their corresponding Table Numbers of Flat Cable II Characteristics Table Number ...

Страница 41: ...r pair 0 55 mm2 maximum 20 AWG maximum Cu Sn plating 20 maximum strands of 0 18 mm 1 twist 15 mm Insulation diameter 2 54 mm 0 06 mm Colors White Blue Pair Twist ft N A Tape shield over pair N A Table 36 Electrical Characteristics of Data Pair Specification for Flat Cable II Electrical Characteristics Specification Impedance 120 ohms 10 at 500 KHz Propagation delay 1 78 nSec ft maximum Table 34 Sp...

Страница 42: ...t 125 KHz 0 25 db maximum at 250 KHz 0 42 db maximum at 500 KHz 0 72 db maximum at 1 0 KHz Table 37 Physical Characteristics of DC Power Specification for Flat Cable II Physical Characteristics Specification Conductor pair 0 75 mm2 maximum 18 AWG maximum Cu Sn plating 30 strands maximum of 0 18 mm minimum twist 1twist 20 mm Insulation diameter 2 54 mm 0 06 mm Colors Red Black pair Twist ft N A Tap...

Страница 43: ...9 Physical Characteristics of General Specification for Flat Cable II Physical Characteristics Specification Geometry Flat Overall braid shield N A Drain wire N A Outside diameter Width 10 16 mm 0 mm 0 5 mm Height 2 54 mm 0 06 mm Roundness Flat Jacket marking Vendor Name and Certification mark Table 40 Electrical Characteristic of General Specification for Flat Cable II Electrical Characteristic S...

Страница 44: ...cies Flexure Specified by vendor under measurement Bend Radius Specified by vendor Operating ambient temperature 10 C 55 C Storage temperature 20 C 65 C Pull tension 40 lbs maximum Connector Compatibility FLAT II TRUNK CONNECTOR Female and male Topology Compatibility Trunk Branch Table 42 Flat Cable II Topology Data Rate Max Cable Distance Trunk Exchange Thick Cable Cumulative Drop Maximum Drop 12...

Страница 45: ...n the DeviceNet Power Bus Table 43 Electric Current Capability of Flat Cable II Based on Network Length Network Length in Meters feet 0 20 66 40 131 80 262 100 328 140 459 200 656 260 853 300 984 320 1050 Maximum Electric Current amps 5 5 5 2 75 2 21 1 58 1 11 0 85 0 74 0 69 Figure 13 Electric Current Capability on DeviceNet Power Bus Length of Network in meters feet Maximun Current Capability amp...

Страница 46: ...viceNet receptacle on the device should be mounted such that the key orientation allows the cable to have no interference with indicators auxiliary connectors or other devices that may require access in the field Hard wired connections such as direct soldering crimping screw terminal blocks and barrier strips are allowed These methods must support node removal without trunk severing requirement Th...

Страница 47: ...nnectors and all nodes that consume or supply power Device removal must be possible without severing or disturbing the network regardless of the chosen connector solution Do not install wires while the network is active This can effect network supply shorting or cause communication disruption Figure 14 Open Connector Profile 5 V red 4 CAN H white 3 drain bare 2 CAN L blue 1 V black Device Connecto...

Страница 48: ...Transmission Media and Components 48 9ARD000015 600 Figure 15 shows the pinout details of a mini connector Figure 15 Mini Connector Profile Male pins Female sockets 1 drain bare 2 V red 3 V black 4 CAN_H white 5 CAN_L blue ...

Страница 49: ...D000015 600 49 Figure 16 shows the pinout details of a micro connector Figure 17 shows the flat trunk connector Figure 16 Micro Connector Profile Figure 17 Flat Trunk Connector Male pins Female sockets 1 drain bare 2 V red 3 V black 4 CAN_H white 5 CAN_L blue ...

Страница 50: ...y can have the following specifications A Schottky Diode which connects to the power supply V allows multiple power supply connections this eliminates the need for custom power supplies For more information about the Schottky Diode refer to Schottky Diode Specifications on page 57 Two fuses or circuit breakers to protect the bus from excess electric current which could damage the cable and connect...

Страница 51: ...Table 44 lists the specifications for the Internal Pass Through Conductor Figure 19 DeviceNet Power Tap Components Table 44 Internal Pass Through Conductor Specifications Conductor Description Specification Drain wire conductor stranded or solid 7 inches maximum of unshielded conductor Maximum conductor resistance is 4 milliohm equivalent to 7 inches of 18 AWG Minimum conductor equivalent at any p...

Страница 52: ...nt is 22 AWG Table 45 Internal Power Drop Conductor Specifications Conductor Description Specification Drain wire conductor to grounding terminal stranded or solid Maximum conductor length of 7 inches Maximum resistance is 2 1 milliohms equivalent to 7 inches of 15 AWG Minimum allowable conductor at any point is 16 AWG V and V Power conductors stranded or solid 12 inches maximum conductor length p...

Страница 53: ...hottky Diode optional 20 amp 30 volt minimum continuous capability over environment Maximum Vf of 0 73 volts Tc 125 C and 16 A minimum test condition MBR3045 recommended Operating voltage 25 volt minimum Contact Rating Trunk line 8 amps minimum for thick trunk 3 amps minimum for thin trunk over temperature for all contacts Drop line The sum of the contact ratings for both V and V must be 16 amps m...

Страница 54: ...48 lists the specifications for the DeviceNet power supply connection These specifications are applicable to single supply multiple supply and the nodes that provide power supply to the network Operating ambient temperature 40 C 70 C 158 F with maximum continuous power on all conductors De rate linearly to 0 amps at 80 C Storage temperature 40 C 85 C Table 48 DeviceNet Power Supply Specifications ...

Страница 55: ... uF maximum Temperature Range Operating 1 0 C 60 C Nonoperating 40 C 85 C Inrush Electric Current Limit Less than 65 Amps peak Over Voltage Protection Yes no value specified Over Electric Current Protection Yes electric current limit 125 maximum Turn on Time with full load 250 msec maximum 5 of final value Turn on Overshoot 0 2 maximum Stability 0 to 100 load all conditions Isolation Output isolat...

Страница 56: ... The temperature coefficient tolerance of 0 6 is based on an actual rating of 0 03 per degree C and a 20 C differential between supplies that are used on the bus If a supply in one location is an ambient of 40 C then it is assumed that other supplies are within 10 C or in the range of 30 to 50 C or another 20 C range If this stipulation is not met and all other tolerances are met then the power ca...

Страница 57: ... Mode Drop 41 66 10 0 V Supply Ripple 0 3125 0 075 V Input Ripple 3 125 0 75 V Total Voltage Budget 51 5 12 96 V 1 Based on a temperature coefficient of 0 03 and an ambient temperature of 60 C Table 51 Recommended Schottky Diode Specifications Specification Parameter Voltage Rating 30 V minimum Electric Current Rating 25 amps Maximum Vf Ifm I0 0 73 V Tc 125 C with 16 A Table 52 DC DC Converter Spe...

Страница 58: ... Linear Regulators none Switchers 100 mA 2 to 10 msec 0 1 A 0 5 A 5 15 msec 0 5 A 1 A 10 20 msec 1 A 2 A 15 30 msec 2 A 20 40 msec Output short circuit protection Electric Current limit Reverse polarity protection Schottky diode in ground path Table 52 DC DC Converter Specification Parameter ...

Страница 59: ...llowable baud rate and is an input to the network power system design Accurate planning of network wiring is necessary as the total trunk length and the cumulative drop length the total length of all drop lines must be controlled The following points are to be considered while designing network wiring Network trunk lines can be designed with thick thin or combinations of thick and thin cable accor...

Страница 60: ...the longest distance between two nodes in the network For the cable length refer to Figure 20 For the respective cable type topology refer to Table 12 Table 22 Table 32 Table 42 The cable length allowed is calculated using the following formulas ThickL 5 ThinL 500 m for 125 kb ThickL 5 ThinL 250 m for 250 kb ThickL 5 ThinL 125 m for 500 kb where ThickL is the length of the thick cable and ThinL is...

Страница 61: ...0 61 3 Cumulative cable length An example of cumulative length shown in Figure 20 is 40 m None of the node has a drop line length of more than 6 m This feature enables to use a data rate of 250 kb Figure 20 DeviceNet Media Technology with Network Length ...

Страница 62: ...e electric current is 1 mA A ground isolation barrier must exist for every device as shown in Figure 21 Products can pass testing according to Federal State and Local regulations Higher working voltages or test voltages may be supported based upon specific application requirements In such cases higher rated voltages and any additional tests are required Table 55 Color Coding for Cables Wire Color ...

Страница 63: ...able types is listed in the appropriate cable specifications in Cable Types on page 21 Smaller gauge cables provide a cost effective means of designing a highly functional flexible low electric current cable system The following are the power bus capabilities of DeviceNet Cable length upto 500 m 1 640 ft Support for as many as 64 nodes of varying electric current Adjustable configuration The flexi...

Страница 64: ...le type refer to Cable Types on page 21 As the electric current drawn from each side of a power tap is more a single supply network can possibly provide twice the amount as drawn from a power tap If the system requirement is more DeviceNet can support multiple power supplies that can result in almost unlimited power Majority of DeviceNet applications require only one power supply For examples of d...

Страница 65: ...r each device on the network 2 Measure the total length of the network 3 For electric current capability based on the network length and the cable type used refer to Section Cable Types on page 21 or the catalogue of the cable supplier 4 If the electric current accumulated from each device is less than the value given in the catalogue for the cable then any one of the configurations available in t...

Страница 66: ...e network supports this configuration For example while using the Thick cable if the accumulated electric current requirement for the network exceeds the value available in Table 13 then Single supply end connected configuration is not appropriate for the network Single supply end connected is the simplest configuration but provides lowest power capability Figure 23 shows a power configuration for...

Страница 67: ...ine the validity of the power supply connected at the physical center of the network A single center connected supply provides double the total of the electric current capability than the single end connected supply 1 Add the electric current ratings of the devices in each section refer to Figure 24 to determine the total electric current in each section As the supply is center connected the bus h...

Страница 68: ... supply center connected configuration Figure 24 shows the single supply center connected using a thick cable trunk line Calculation method Section 1 length Section 2 length 400 ft Section 1 electric current 0 1 A 0 25 A 0 2 A 0 55 A Section 2 electric current 0 15 A 0 25 A 0 15 A 0 55 A Table 13 electric current limit for 400 ft Section 1 2 63 A Table 13 electric current limit for 400 ft Section ...

Страница 69: ...hen execute one of the following actions Move the position of the supply along the overloaded section and recalculate Move the power supply to push one of the nodes from the overloaded section to the other section b In both sections use two power supplies Figure 25 shows an example of a single supply center connected network which uses a thick cable trunk line with a overload Calculation method Se...

Страница 70: ...aded section Figure 26 shows a solution to Single supply center connected with overload Calculation method Section 1 300 ft Section 2 500 ft Section 1 electric current 1 1 A 1 25 A 2 35 A Section 2 electric current 0 5 A 0 25 A 0 25 A 0 85 A 1 85 A Table 13 electric current limit for 300 ft Section 1 3 51 A Table 13 electric current limit for 500 ft Section 2 2 10 A Conclusion No overload on eithe...

Страница 71: ...s the allowed drop line electric current in amps and L is the drop length in feet or I 4 57 L where I is the allowed drop line electric current in amps and L is the drop length in meters The operating electric current of the device represents the average electric current drawn from the bus If the maximum operating electric current of the device exceeds the average electric current by 10 then the m...

Страница 72: ...k Power on page 63 to prevent network overloading To verify accurate configuration measure the voltage once the network is constructed A minimum of 11 volts is required at a node and the maximum voltage drop from V to V of 10 V is permitted Allow sufficient margin of error to correct configuration problems without damaging the network For heavily loaded multiple supplies turn on all supplies simul...

Страница 73: ...Any of the shelf power supply can be used until it meets the following general requirements and the detailed requirements listed in Table 48 24 VDC Ability to support linear and switching regulators Tolerance of 24 VDC 1 and electric current capability of 0 16 amps single and multiple supply applications Supply outputs must be isolated from the AC line and chassis ...

Страница 74: ...Power Supply Options Section 3 Installation 74 9ARD000015 600 ...

Страница 75: ...op near the ends Check the termination location and measure the terminators Check the power supply cable length and gauge Check for one and only one earth ground of the V and shield Break the combination shield V connection to frame ground and verify 1 0 Mohm to frame ground Check for one and only one V to shield connection Break the shield V connection at the power supply and verify 1 0 Mohm shie...

Страница 76: ... together tightly Check that glands are screwed tightly Check for foreign material electrical tape RTV etc in glands Check that nodes are not touching extremely hot or cold surfaces Check that cables are kept a few inches away from power wiring Check that cables are not draped on electric motors relays contactors or solenoids Check that cables are not constrained so as to place excessive tension o...

Страница 77: ...ics 37 Flat Cable II Electric Current Capability 45 Topology 44 Flat cable II Data Pair Specification Electrical Characteristics 41 Physical Characteristics 41 Flat cable II DC Power Specification Electrical Characteristic 43 Physical Characteristics 42 Flat cable II General Specification Electrical Characteristic 43 Environmental Characteristics 44 Physical Characteristics 43 Flat Trunk Connector...

Страница 78: ...a Pair Specification Electrical Characteristics 23 Physical Characteristics 23 Thick Cable DC Power Specification Electrical Characteristics 24 Physical Characteristics 24 Thick Cable General Specification Electrical Characteristic 25 Environmental Characteristics 26 Physical Characteristics 25 Thin Cable Electric Current Capability 33 Topology 32 Thin Cable Data Pair Specification Electrical Char...

Страница 79: ......

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