CPC Wiring Recommendations.book
Contents
1. gt TERMINATED amp BIASED ALL 3 JUMPERS SET TO UP POSITION TERMINATED NO BIAS MIDDLE JUMPER SET TO UP POSITION OR USE MODBUS TERMINATION BLOCK Figure 6 2 Network and MODBUS Termination and Biasing 6 1 1 1 MODBUS Termination Blocks Third party devices may or may not have on board termination jumpers consult the manufac turer s instructions for termination information Network Structure Biasing and Termination Resistance 7 If an end device does not have termination jump ers CPC offers a termination block that can be used to terminate MODBUS network endpoints CPC P N 535 2711 Connect this block just before the end device Figure 6 3 and connect the shield to earth ground keeping the exposed shield wire length as short as possible 3 inches ideal maximum length Shield Wire gt TO LAST DEVICE AT END OF DAISY CHAIN 26501113 Figure 6 3 MODBUS Termination Block P N 535 2711 FROM LAST DEVICE AT END OF DAISY CHAIN SHIELD WIRE Y CONNECT TO EARTH GROUND Figure 6 4 MODBUS Term Block End of Chain Install 6 2 Echelon Networking Echelon devices are networks together into con figurations called segments A segment is a group of up to 64 Echelon devices that are connected2. 026 1903 Rev 4 19 APR 2010 EINSTEIN E2 Controller Wiring Practices m 4 EMERSON EMERSON 3240 Town Point Drive NW Suite 100 Kennesaw GA 30144 Phone 770 425 2724 Fax 770 425 9319 ALL RIGHTS RESERVED The information contained in this manual has been carefully checked and is believed to be accurate However Computer Process Controls Inc assumes no responsibility for any inaccuracies that may be contained herein In no event will Computer Process Controls Inc be liable for any direct indirect special incidental or consequential damages resulting from any defect or omission in this manual even if advised of the possibility of such damages In the interest of continued product development Com puter Process Controls Inc reserves the right to make improvements to this manual and the products described herein at any time without notice or obligation FCC COMPLIANCE NOTICE This device complies with Part 15 of the FCC Rules Operation is subject to the fol lowing two conditions 1 this device may not cause harmful interference and 2 this device must accept any interference received including interference that may cause undesired operation CE COMPLIANCE NOTICE Class A Product Information for Einstein E2 Controllers The CPC Einstein and E2 controllers are Class A products Ina domestic environment this product may cause radio interference in which case the user may be required to take adequat
3. Maximum Cable iia ya a asl RE 5 5 POWER WIRE GAGE SELECTION ii ssisscscessitescassvest densessoossteascdesosessvsetavseavocsueesessoels sosstacess sosvoncedesesnectenssvsevesssaveess 6 6 NETWORK STRUCTURE BIASING AND TERMINATION RESISTANCE 22 s20200022000000200200000000202 0000200000 7 6 1 RS48S5 NETWORKING ne einen e a rk 7 6 1 1 Terminating and Biasing an I O Networks and MODBUS Networks 00 00 0s 2 6 2 ECHELON NETWORKING u 2a ann A ee LL 8 6 2 1 Echelon Network FORMING HOR 0110 0 ri BE al 9 7 CABLE AND DEVICE GROUNDING 2222 22000022200000000200000000000000000 000000000000 nneennnnsnennnssnnnneennnesssnnnssnsnnsensnnsnsnnnsennne 10 751 GENERAL GROUNDING GUIDELINES hi ear 10 751 Ground Wire Specifications sic seni ate kk m A ida 10 7 1 2 Ground Source Specifications 10 7 2 POWER INPUT AND RS485 MODBUS GROUNDING erener enne 10 72 1 TED sce seksle al all EF EO SEES lll a Dell ll mani ime Sel SEERE zile 10 7 2 2 RS485 I O and MODBUS Devices except Control 11 723 Conirol Link Modules Sau en as en m EN e am A IRE din dd 11 7 3 EMI RESISTANT RS485 NETWORK GROUNDING PRACTICES eee 11 4 NSD DRIVE GROUND NO PRACTICES A pl lll larla giy ade ila atico 12 TAL Analog Output Cable Esik a eel ak maya la lb sl ad Ra 13 1 5 ECHELON CABLE GROUNDING anal a ka Bill Bal lela la ad
4. analog output or 4AO board to drive a Control Techniques VSD you MUST use shielded cable between the analog point and the VSD drive speed input Refer to Section 4 2 for specified cable types On the end of analog output cable connected to the VSD input connect the shield wire to an earth ground On the I O device end clip the shield wire at the point of exposure do NOT connect this end of the shield wire to a terminal on the 1 O device or to an earth ground Figure 7 3 shows proper grounding for a Multi Flex I O board and analog output cabling for a device connected to a VSD MULTIFLEX CHASSIS S 9 EARTH GROUND EARTH GROUND CHASSIS SHIELD CLIP SHIELD EARTH GROUND Figure 7 3 MultiFlex and AO Cable Grounding Echelon Cable Ground ing The shield wires for Echelon cable should be connected to the OV center pin of each Echelon net work connector At each node and at each break in the shield connect the OV terminals to earth ground Use 16AWG 18AWG wire for the 3 8 1 mm Eche lon connectors and 14AWG or greater for the 5mm Echelon connectors and limit the ground wire length to six inches or less 7 5 At the E2 it is recommended the shield wire be connected to a separate earth ground outside of the E2 enclosure instead of connected to the OV terminal on the E2 s Echelon conne
5. together on an unbroken series of wires The recommended way of constructing an Eche lon Network is called daisy chaining In the daisy chain network configuration devices are arranged by subnets which consist of one E2 and all Echelon devices associated with the E2 8 E2 Controller Wiring Practices First all devices in a subnet are connected in an unbroken chain without branches or star configura tions see Figure 6 5 Then if more than one E2 is present on site all chains are connected so that the entire network forms a large unbroken chain called a daisy chain see Figure 6 6 This allows for all devices in the Echelon Network to be hard wired together for trouble free communication RECOMMENDED E2 Y CABLE E2 NS lt CABLE 3 LONWORKS DEVICES UNBROKEN CHAIN E226513125rev Figure 6 5 Echelon Wiring Subnets CABLE Figure 6 6 Echelon Wiring pt 2 026 1903 Rev 4 19 APR 2010 6 2 1 Echelon Network Termina tion Echelon networks require the devices on each end ofthe daisy chain to be terminated with a 105 ohm resistor across the signal carrying leads Most CPC manufactured Echelon devices have on board termination jumpers that when set to the termi nated position provide the required termination resistance refer to the device s own installation doc umentation Ifthe device does not have termi
6. wir ing RS485 I O networks MODBUS Echelon and Ethernet networks in an E2 control system 1 1 Noise and its Effects Noise in the context of this document refers to EMI induced on a network wire or connector that result in signals that hinder the controllers ability to receive and send network messages Just as loud audio noise in a room makes it harder for people to communicate with each other through speech a noisy network makes it hard for a control device to read messages sent from other controllers You should suspect a noisy network if your E2 control system experiences any of the following problems Noise and its Effects e Periodic outages of communication between the main controller E2 and its peripheral devices This is most often indicated by a large number of Controller Offline alarms in the E2 Alarm Log which usually return to normal Inability to commission devices during setup During commissioning the E2 attempts to find a device and read its commissioning information on a noisy net work the E2 may fail to find devices or require sev eral retries before finding them Noise may also cause commissioning to proceed very slowly e Intermittent Ethernet connections to E2 ping works but UltraSite or InSite cannot make connection to the 2 e Communication outages that occur when changes are made to network connections to the E2 Example the V O network devices stop communicatin
7. 2 to switch or hub Exceed ing this length will cause communication problems SHIELD FOIL W WIRE WRAPPED AROUND Figure 4 1 5 Shielded Cable w 1 Stripped Jacket White Green Green White Orange Blue White Blue 6 Orange White Brown Brown White Orange Orange White Green Blue White Blue 6 Green White Brown Brown 568B CABLE END Figure 4 2 586A amp 586B Cable End Wire Color Diagram Ethernet Network Wiring Using The Correct Cable 5 5 Power Wire Gage Se lection The gage of wire used to connect networked devices to the transformer secondary also plays a sig nificant part in noise reduction Most control lers and I O devices are powered 24VAC transformers Power wiring from the transformer sec ondary should be either 18AWG 16AWG or 14AWG depending upon the total wire length to all devices and the total VA of all devices powered To determine the correct wire gage to use 1 Add together the VA ratings of all devices that will be powered by the transformer Table 5 1 shows the VA devices for the E2 controller and the most common RS485 I O and Echelon devices used in an E2 control system Center 8IO ARTC except ESR Table 5 1 VA Ratings for CPC YO Devices 2 Use the total VA calculated in step 1 in the following eguations to determine the maximum wire length allowable for each wire gage 14AWG 16AWG 1200 VA feet 750 VA
8. 9 m between the E2 and the end device on the network Provided the cable can be routed away from noise generators and running in parallel with high voltage wire any of the three specified cables will provide adequate shielding from external noise 4 2 Analog Output Wiring Control Techniques VSDs If using a MultiFlex analog output or 4AO board to drive a Control Techniques VSD you MUST use shielded cable between the analog point and the VSD drive speed input Use the same two connector shielded cable specified for RS485 use Belden 8641 24AWG 300V CPC P N 135 8641 Belden 8761 22 AWG 300V not stocked by CPC or a 600V shielded 22AWG equivalent stocked by CPC P N 135 0600 4 E2 Controller Wiring Practices 4 3 Echelon Network Wiring CPC specifies one type of cable for Echelon Net work wiring a Level 4 twisted pair stranded shielded cable that meets all requirements for Eche lon LonWorks networks This cable is available in both plenum and non plenum varieties from CPC see part numbers in Table 4 1 This cable is the only cable type supported by CPC Cable Type CPC Part Number 1 pair non plenum 135 2300 1 pair plenum 135 2301 Table 4 1 Recommended Wiring 4 4 Ethernet Network Wiring 4 4 1 Shielding Standard unshielded CAT5 5e cable can be used for wiring E2s to an Ethernet network as long as the cable is not run near sources of electrical noise Oth erwise if the cable will be used
9. Power Connec tor Terminal Each RS485 I O and MODBUS device includ ing both devices that are powered by center tapped transformers and devices powered by non center tapped transformers must have the 0V terminal of the power connector connected to a separate earth ground Separate earth ground means you may NOT wire the OV connectors of multiple boards in series and ground at one point Each 0V terminal must be earth grounded separately Connect each 0V terminal for all networked devices earth grounds using ground wires at least 14AWG and no longer than six inches 7 2 2 2 The shield wires of the network cable are nor mally connected to the center 0V terminal of RS485 I O connector Provided the power inputs are properly grounded you do not need to connect the center 0V terminals to separate earth grounds since the center pins of both the power and network con nectors are common on the board Grounding the Network Cable If the network is experiencing problems with EMI or is known to be in a high noise environment follow the EMI resistant wiring guidelines for grounding the shield wire outside the E2 enclosure Section 7 3 1 Ground the Shield Outside of the E2 7 2 3 Control Link Modules The Control Link Module does not have a ground terminal on its power output The only ground connection on the Control Link that needs to be earth grounded is the Common terminal on the top input block see Fi
10. ching and star configurations can seriously affect net work performance and therefore are not allowed 6 1 1 Terminating and Biasing an I O Networks and MODBUS Networks Proper termination and biasing is an important part of reducing I O network noise All CPC manu factured devices with RS485 ports are equipped with three on board jumpers that can provide the resis tance necessary to terminate and bias the network endpoint The middle jumper provides the termina tion resistance while the two outside jumpers pro vide biasing RS485 Networking VO Network daisy chains must be terminated AND biased at both ends of the daisy chain Figure 6 2 MODBUS daisy chains must be terminated at both ends of the daisy chain but must only be biased at ONE end Biasing the E2 is the preferred method of network biasing Most third party MODBUS devices have no termination or network bias capabil ities and will require use of a MODBUS termination block see Section 6 1 1 1 MODBUS Termination Blocks Others like the Control Link have three jumpers similar to CPC I O devices For these devices set the termination jumper middle to the UP position and leave the biasing jumpers in the DOWN position Figure 6 2 RS485 NETWORKS DOD TERMINATED amp BIASED ALL 3 JUMPERS SET TO UP POSITION MODBUS NETWORKS
11. ctor Echelon Cable Grounding 7 5 1 EMl Resistant Echelon Net work Grounding For High EMI Environments If the Echelon network must be in contact with noise generating devices or be installed in a high EMI environment the same practices used for grounding RS485 networks may be used to ground Echelon networks Refer to Section 7 3 EMI Resis tant RS485 Network Grounding Practices and follow the same practices for Echelon shield grounding as are shown in this section for RS485 shield ground ing Cable and Device Grounding 13 S Control Techniques Drives Ltd EMERSON TECHNICAL NOTIFICATION 7080101 Title Commander SK Size 3 Earth Leakage Current Product Commander SK Issue Date 14 January 2008 Variant N A Date Codes Category General Manuals affected Yes Issued By Dominic Sim Priority Normal SUMMARY It has been highlighted that not all users are following the advice given in the Commander SK manuals with respect to hazards of unrestricted access to the control circuits if they are not earthed grounded Failure to comply with this advice may result in an electric shock MORE INFORMATION There is a voltage present between OV and ground earth which is due to capacitive coupling between the power and control circuits in the inverter The stray capacitance between the power and control circuits results in a high frequency leakage current flowing when the drive is running The current flow is dependan
12. e if the power connector is grounded against the panel chassis ground the network wires to the same chassis Keep the total exposed length of the shield wire as short as possible three inches ideal length For breaks inthe middle of the segment twist the two shield wire ends together and connect them both to the same earth grounded point 4 Atthe E2 remove the network cable shield wire s from the OV center terminal of the RS485 network connector leave nothing connected to the OV termi nal 5 Strip the cable jacket and shielding at the point where the cable s enter the E2 enclosure Connect the wire s to the same earth ground the GROUND connector is connected to For example if the E2 s GROUND power connector is grounded against the panel chassis ground the network wires to the same chassis If the E2 is not at the end of the network seg ment the shield wire of both cable segments leading to I O connector must be earth grounded outside the E2 enclosure Twist the two shield wires together and connect them both to the same earth grounded point Do NOT connect network shield wires to the GROUND connector on the E2 PIB VO and MODBUS network wires must be grounded sepa rately from the EARTH GROUND connector as shown in Figure 7 2 Steps 2 and 3 may be followed for any and all network devices on an RS485 I O or MODBUS net work segment Ifa source of noise cannot be found or ift
13. e measures This covers All Einstein family product types RX Refrigeration Controller 830 BX Building HVAC Controller 831 xxxx and all ver sion models 300 400 500 All E2 family product types RX Refrigeration Controller 834 xxxx BX Building HVAC Controller 835 xxxx CX Convenience Store Controller 836 xxxx and all version models 300 400 500 Table of Contents 1 OVERVIEW nee a ais aot eae e EY 1 Li NOISE AND ITS EFFECTS 2 22 N A EE E TEREA 1 1 22 SOURCES OF NOISE si a asmak li ye ll A Sas Us KA Ba sene an 1 2 AVOIDING NOISE GENERATING DEVICES u csssccsssssccessccccssscscssccessscceesssecessccessnaccesscccessececensccessssececseccenses 2 2 1 CONTROL TECHNIQUES VARIABLE SPEEDDRIVES erener 2 3 AVOIDING HIGH VOLTAGE WIRING u 82 020 una NE sense seen DAK K AS ene een see 3 4 USINGTHE CORRECT CABLE sossecsadicccsccscdecsvesatinccessvesndeeteteetustusvesotesesedetetucuesvscetusosevsnsbeestandenbedcedeesvovescuedsdevstebeuees 4 4 1 5485 COMMUNICATION WIRING nass nase nes es LLA Y L LE AND 4 4 2 ANALOG OUTPUT WIRING CONTROL TECHNIQUES 4 43 ECHELON NETWORK WIRING u ccccsesssccccecesscceececesscseccecsensseseecsessuececcsesaeeeeeecnesseeeecesessaeeececesssaeccecesuaueeecceensaececesenensaeees 4 4 4 ETHERNET NETWORK WIRING 2 2 es engen este ici 4 4 4 1 gt Shielding n 2 0 E amal la E sie li g l est 4 442
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15. edi sa sallan RA OER 13 7 5 1 EMI Resistant Echelon Network Grounding For High EMI Environments 13 E2 Controller Wiring Practices Table of Contents v 1 Overview One of the most common causes of communica tion problems experienced by CPC site controllers is excess electromagnetic interference EMI com monly referred to as electrical noise or just noise Because refrigeration and HVAC controls are typi cally installed in motor rooms and utility rooms they are often in close proximity to other electrical devices that generate EMI such as power lines or motors Noise can be picked up by any length of wire Just as an antenna helps a radio receive AM and FM radio signals a long length of wire between a con troller and 1 O board or sensor can also act as an antenna for noise CPC site controllers such as the E2 as well as the peripheral I O boards and unit controllers to which it communicates go through rigorous testing to ensure 1 that they are not overly susceptible to noise and 2 that the devices themselves do not gen erate excess noise Regardless every long wire used in network power and signal wiring can poten tially be an antenna for EMI Unless proper noise abatement wiring practices are used even one wiring mistake could result in enough noise to impede or disable an RS485 Echelon or Ethernet network This document is meant to provide a list of guidelines that should always be followed when
16. ell as the devices the E2 is networked with should be physically located far away from noise generating devices The minimum distance devices and cabling should be kept away from noise generators is 1 ft 0 3m with 5 ft 1 5 m being the ideal minimum distance The minimum distance may be more or less depending on the amount of noise generated by the device refer to the device s user manual for more information 2 1 Control Techniques Vari able Speed Drives E2 controllers whose versions are 2 40F01 and above feature the ability to communicate with certain models of Control Techniques variable speed drives VSDs using a MODBUS network connection Control Techniques and CPC both require all VSDs that will network with E2 controllers to be installed with line filters to minimize noise If install ing an E2 network into a site that already has installed VSDs verify the drives were installed with line filters before networking them to an E2 Contact your Control Techniques representative to obtain line filters and assistance with installation 2 E2 Controller Wiring Practices In addition CPC requires that all MODBUS net work connections to Control Techniques VSDs use a CT Drive Interface P N 535 2725 This assembly which plugs into the RJ45 MODBUS jack on the VSD provides the noise filtering circuitry recom mended by Control Techniques and it also provides a screw terminal connector for easier daisy chaining to t
17. feet 6 E2 Controller Wiring Practices 18AWG 660 VA Estimate the total length of wire necessary to power the devices measured fromthe transformer secondary to the last device that will be connected Using the maximum wire lengths calculated in step 2 choose a gage of wire whose maximum wire length is longer than the total length of wire you will be using Example A 24VAC transformer will be used to power three MultiFlex 168AOs The total length of power wire needed is 15 feet Since the total VA of the three MultiFlex boards is 45VA ISAWG wire may not be used since 462 45 10 2 feet maximum I6AWG wire and 14AWG wire may both be used since with 45VA these wires would have maximum distances of 16 7 ft and 26 7 ft respectively 026 1903 Rev 4 19 APR 2010 6 Network Structure Bi asing and Termina tion Resistance 6 1 RS485 Networking The RS485 Input Output I O Network connects all input and output communication boards together in a single open communications loop This loop or daisy chain connects the E2 to multiple input and output communication boards and terminates at the last input or output board on the network A diagram of this network arrangement is shown in Figure 6 1 CPC INS INPUT OR OUTPUT BOARD 26513041 Figure 6 1 I O Network Configurations Daisy chains are the only allowable network structure for CPC RS485 I O networks Bran
18. g when the Ethernet cable is plugged into the E2 Reboots of the E2 in situations where excessive noise 1s present 1 2 Sources of Noise The most common causes of noise in an E2 con troller installation are e Wiring that comes close to an electrical device that generates lots of noise e Routing cable that runs parallel and or in close prox imity to wires that carry high AC voltage and current Network cable that does not meet specifications Power wiring from the transformer secondary that is the wrong wire gage Improper network structure or termination resistance and e Cable that is not grounded or that is grounded improp erly Overview 1 2 Avoiding Noise Gen erating Devices There are a number of electrical devices com monly used in supermarkets and buildings that gener ate noise e Motor starters contactors or other electrical equip ment that switches ON and OFF Switching heavy electrical loads ON and OFF will generate noise Inverters for variable speed motors Inverters gener ate a constant amount of high levels of noise e Fluorescent light ballasts Light ballasts also generate constant noise e Arc welders excessive intermittent noise The best way to eliminate network noise coming from a noise generating device is to keep all net worked devices and cable runs as far away from the device as possible Cable runs should be routed around noise generating devices and the E2 as w
19. gure 7 1 The ground wire EMI Resistant RS485 Network Grounding Practices should be at least 14AWG stranded no longer than six inches and should be routed away from all high voltage wiring leading from the power input and the relay outputs High voltage wiring 15 gt 0 lo o Figure 7 1 Earth Ground Connection Location 7 3 EMI Resistant RS485 Network Grounding Practices If you are experiencing network problems that might be related to noise it is best to eliminate the noise path at the device itself and through earth grounding prevent the noise from traveling through the cable into the E2 Begin by identifying potential sources of noise and identifying what I O or MODBUS devices are near the noise source or connected by cable to the noise source refer to Section 1 2 and Section 2 for common noise sources For example a MultiFlex 168 connected to a VSD drive by analog output cable would be a possible source of harmful noise For I O and MODBUS devices connected to or near high noise devices 1 Ensure the power connector is connected to a good earth ground as per Section 7 2 2 1 2 Remove shield wire s connected to the OV cen ter terminal ofthe RS485 network connector leave nothing connected to the OV terminal 3 Connect the network cable shield wire to the same earth ground the power connector is connected to For Cable and Device Grounding 11 exampl
20. he MODBUS network For further information on noise abatement when using Control Techniques VSDs consult the manu facturer s instructions and follow all recommended guidelines for installing the drive and reducing noise Furthermore when using VSDs it is highly recom mended you follow the EMI resistant wiring guide lines outlined in Section 7 3 EMI Resistant RS485 Network Grounding Practices 026 1903 Rev 4 19 APR 2010 3 Avoiding High Voltage Wiring A common mistake made by wiring technicians is to wire communication cabling in parallel with 120VAC 240VAC or 480VAC power wiring some times together in the same conduit High voltage wiring radiates noise in all directions perpendicular from the direction of the wire When a communica tion wire is run parallel and in close proximity to a high voltage wire the electromagnetic field from the high voltage wire will induce noise on the communi cation cable The amount of noise induced depends on the voltage and current of the wire the distance between the two wires and the angle between the two wire runs with parallel being the highest induc tion To avoid noise induced from high voltage wir ing 1 If possible wire serial Echelon and Ethernet wiring away from high voltage wire Communication cabling should be kept a minimum of 3 in 7 6 cm apart at all points with 12 in 30 cm being the ideal minimum distance 2 Do not wire communication wire and high v
21. he network in general is exposed to high EMI it is recommended all network shield wires be discon nected from OV terminals and earth grounded near the device Figure 7 2 shows an example of an EML resistant E2 networked with MultiFlex boards with each device grounded properly E2 ENCLOSURE E2 PIB RS485 COM 2 ECHELON GROUND 24VAC 804 000 pod o EARTH GROUND CHASSIS EARTH GROUND CHASSIS 14AWG MULTIFLEX poa MULTIFLEX EARTH GROUND CHASSIS SHIELD VER Figure 7 2 RS485 Network Segment Grounding Practices E2 and MultiFlex 7 4 VSD Drive Grounding Practices Due to noise concerns itis recommended that all I O devices networked or connected to a VSD drive follow the guidelines for EMI resistant network device grounding see Section 7 3 12 E2 Controller Wiring Practices For Control Techniques SK3500 series VSDs and Unidrives you must connect the OV terminal of the drive to the earth grounded chassis of the drive with a 14AWG stranded wire See Control Tech niques Technical Notification T080101 included for your convenience at the end of this document For all other VSD types refer to the manufactur ers instructions before grounding the OV terminal 026 1903 Rev 4 19 APR 2010 7 4 1 Analog Output Cable Grounding If using a MultiFlex
22. in noisy environ ment shielded CATSe cable Belden 1533 plenum 1533R for non plenum should be used For this type of cable you should use shielded RJ45 connectors meant for solid conductor wire L Com TDS8PC5 or equivalent When connecting CATSe cable to shielded RJ45 connectors 026 1903 Rev 4 19 APR 2010 1 Carefully strip the outer sheath insulation back 1 Roll back the foil shield insulation and wrap the drain wire around the foil Figure 4 1 Do not remove any insulation from the conductors 12345678 2 Untwist the wires to within 1 8 of the jacket Arrange Connector shown the wires according to TIE EAI 586A amp 586B Fig w locking tab down Pin 1 far left ure 4 2 For straight patch cables wire both ends 586A for crossover cables wire one end 586A and i Taka the other 586B Insert wires into the loading bar Trim 1 4 into connector excess wires 3 Hold the connector in front of you with the locking tab down Orient the wires so connector pin 1 aligns with cable pin 1 etc Pin 1 is on the far left Slide the wires into the CATSe connector The cable jacket should extend into the connector about 1 4 for strain relief Figure 4 3 4 Insert the plug into a crimp tool Firmly squeeze the Figure 4 3 CAT5e Cable End Loaded Into Connector handles to set the contacts and secure the cable 4 4 2 Maximum Cable Length An Ethernet cable should be no longer than 328 feet 100 meters from E
23. nation jumpers CPC offers an Echelon termination block P N 535 2715 that may be wired in series right before the end device see Figure 6 7 or at the end of an Echelon network run necessary for TD3 instal lations Figure 6 8 The termination block provides the necessary 105 ohm resistance for network termi nation Shield Wire gt TO LAST DEVICE END OF DAISY CHAIN El 26501113 Figure 6 7 Echelon Termination Block P N 535 2715 TD3 ECHELON WIRING W TERMINATION SHIELD WIRING STUB LEAVE SHIELD UNCONNECTED ECHELON DAISY CHAIN To K INCOMING STUB SHIELD ECHELON DAISY CHAIN o INCOMING I BLUE BEE l 14AWG 6 or less EARTH CHASSIS DOLPHIN SUPER B CONNECTORS GROUND Figure 6 8 Termination Block Usage With TD3s Echelon Networking Network Structure Biasing and Termination Resistance 9 7 Cable and Device Grounding Proper grounding is an essential part of reducing network noise Failure to properly ground power and network wiring is one ofthe most common causes of critical noise problems Follow these guidelines when installing RS485 MODBUS and Echelon net works and refer to them when troubleshooting prob lematic installations to ensure the grounding is correct 7 1 General Grounding Guidelines A good ground wire provides a low DC resis tance path between the cable s or device
24. oltage wire in the same conduit Always separate the power wiring in a separate grounded rigid steel conduit if the two wires must be run close together and in parallel 3 Avoid running even part of the communication wiring in close parallel with high voltage wiring A run of parallel wire as short as a few inches could yield enough noise to affect network communication If the wires must cross each other in close proximity cross them perpendicular to each other so the amount of noise is minimized see Figure 3 1 Control Techniques Variable Speed Drives INCORRECT 480V POWER CABLE RS485 NETWORK CABLE CABLES TOO CLOSE amp RUN IN PARALLEL BETTER 480V POWER CABLE CABLES CROSS PERPENDICULARLY BEST ALTERNATIVE IF CABLES CANNOT BE ROUTED AWAY FROM EACH OTHER BEST 480V POWER CABLE RS485 NETWORK CABLE CABLES ROUTED AWAY FROM EACH OTHER Figure 3 1 Examples of Good amp Bad Cable Routing Avoiding High Voltage Wiring 3 4 Using The Correct Ca ble 4 1 RS485 Communication Wiring specifies all RS485 I O and MODBUS wir ing used by the E2 must be Belden 8641 24AWG 300V CPC P N 135 8641 Belden 8761 22 AWG 300V not stocked by CPC or a 600V shielded 22AWG equivalent stocked by CPC P N 135 0600 These are two connector shielded twisted pair cable that support a maximumdaisy chain cable distance of 4000 feet 121
25. or CDs grounding must be done on both the power inputs and the network connector terminals for each device in the network including the E2 7 2 1 E2 7 2 1 1 Grounding the EARTH GROUND Terminal The Power Interface Board PIB on the E2 has an earth ground connector J3 next to the power con nector on the lower right corner of the board Con nect this connector to an earth ground source using a ground wire at least 14AWG and no longer than six inches To further ensure the ground path is com plete Scrape away any paint or coating if grounding to a panel or chassis Use the shortest piece of 14AWG stranded wire avail able e If grounding to the door of a panel make a second 14AWG wire connection between the panel door and the chassis do not rely on the hinges of the panel to provide ground connection to the chassis 7 2 1 2 Grounding RS485 Network Cable Provided all power connectors are properly grounded the shield wire for all cables connecting to an E2 network connector may be connected to the center OV terminal of the network connector 026 1903 Rev 4 19 APR 2010 If the network is experiencing problems with EMI or is known to be in a high noise environment follow the EMI resistant wiring guidelines for grounding the shield wire outside the E2 enclosure Section 7 3 1 Ground the Shield Outside of the E2 7 2 2 RS485 I O and MODBUS De vices except Control Link 7 2 2 1 Grounding the
26. s ground connection and the earth ground However because of the presence of high frequency AC noise the ground wire itself must also be limited in length or else it may become an antenna and add noise to the network 7 1 1 Ground Wire Specifications The length of all ground wires should be kept to 6 inches 15 3 cm or less Use a 14AWG stranded wire or larger 7 1 2 Ground Source Specifica tions The best good earth ground sources to use are listed below in priority order large metal panel or plate that is connected to a good electrical ground A panel or plate that is at least 3 feet by 3 feet 0 9 m by 0 9 m is desirable Earth grounded steel rack If none of these types of earth ground sources are available as a last resort use one of the following types of earth grounds These are not ideal and should not be used unless absolutely necessary e Metal electrical conduit connected to an earth ground Water pipes metal assuming there are no plastic sec tions 10 E2 Controller Wiring Practices e Electrical system earth ground Note If grounding against a metal plate or panel that is coated or painted scrape away the coating to expose the bare metal before making the ground attachment and use a tooth washer 7 2 Power Input and RS485 MODBUS Grounding For E2s networked with RS485 I O Network devices such as MultiFlex or MODBUS devices such as Control Link RSCs
27. t on the level of capacitance present Note that due to the high frequency content it cannot be measured accurately by a DVM The size 3 has a relatively high capacitance compared to size 2 and the current can cause a painful shock which is not directly hazardous but could lead to an accident The leakage current present on the Commander SK size 3 can cause interference with the Serial Communications on the drive due the leakage current being present on the Serial Communications connection Therefore contact with exposed communication cable connections should be avoided CONTROL Page 1 of 2 TECHNIQUES TECHNICAL NOTIFICATION T080101 Commander SK Size 3 Earth Leakage Current RESOLUTION To eliminate the leakage current problem the control should be connected to earth ground at the drive This can be achieved by 1 Connecting the directly to the triangular grounding bracket supplied with the drive 2 Connecting the directly to earth ground using the M5 earth connection as in Figure 1 Figure 1 y If it is necessary for the OV to remain floating with respect to earth such as when 4 20mA reference is being used then this connection can be achieved by using a capacitor of 15nF or higher 600Vdc It should be noted that there is only single isolation therefore the necessary access protection should be implemented MANUAL UPDATE The product manuals will be updated during th
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