Electro Industries 1252 Installation And Operation Manual Download Page 124

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Electro Industries/GaugeTech

Doc # E107706 V1.2

9-12

9.7.2: Communication

Maximum registers per request, read or write, is 4 registers.orm

The device will operate with the following Default Parameters:

Address

247 (F7H)

Baud Rate

57600 Baud

Transmit Delay Time

20 csec

Some situations will cause the device to operate with the above Default Parameters. See section
9.4.1 for details of Default Mode.

9.7.3: Normal Mode

Normal Mode consists of one process:

1. The device accepts new commands to control the relays.

Summary of Contents for 1252

Page 1: ...ies GaugeTech Installation Operation Manual Version 1 25 November 13 2006 Doc E107706 V1 25 1800 Shames Drive Westbury New York 11590 Tel 516 334 0870 Fax 516 338 4741 Sales electroind com www electroind com The Leader in Web Accessed Power Monitoring and Control ...

Page 2: ...Electro Industries GaugeTech Doc E107706 V1 25 ...

Page 3: ...nsmitted in any form or by any means electronic or mechanical including photocopying recording or information storage or retrieval systems or any future forms of duplication for any purpose other than the purchaser s use without the expressed written permission of Electro Industries GaugeTech 2006 Electro Industries GaugeTech Printed in the United States of America Electro Industries GaugeTech Doc...

Page 4: ...oring Nexus 1250 1252 is not a user serviceable product OUR PRODUCTS ARE NOT TO BE USED FOR PRIMARY OVER CURRENT PROTECTION ANY PROTECTION FEATURE IN OUR PRODUCTS IS TO BE USED FOR ALARM OR SECONDARY PROTECTION ONLY THIS WARRANTY IS IN LIEU OF ALL OTHER WARRANTIES EXPRESSED OR IMPLIED INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE ELECTRO INDUSTRIES GAUGETECH...

Page 5: ...duction of power monitoring products All EIG products are designed manufactured tested and calibrated at our facility in Westbury New York Applications Q Multifunction power monitoring Q Single and multifunction power monitoring Q Power quality monitoring Q On board data logging for trending power usage and quality Q Disturbance analysis Futura Series Products Q Power quality monitoring Q High acc...

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Page 7: ...tions 2 6 2 7 Demand Integrators 2 10 2 8 Nexus External I O Modules Optional 2 12 2 9 Nexus 1250 1252 Meter Specifications 2 13 2 10 Nexus P40N P41N P43N External Display Specifications 2 14 2 11 Nexus P60N Touch Screen Display Specifications 2 14 Chapter 3 Hardware Installation 3 1 Mounting the Nexus 1259 1252 Meter 3 1 3 2 Mounting the Nexus P40N P41N P43N External Displays 3 3 3 3 Mounting the...

Page 8: ...ew 5 18 5 17 Remote Communication RS 232 5 21 5 18 Remote Communication RS 485 5 21 5 19 Programming Modems for Remote Communication 5 22 5 20 Selected Modem Strings 5 23 5 21 High Speed Inputs Connection 5 23 5 22 Five Modes of Time Synchronization 5 24 5 23 IRIG B Connections 5 25 Chapter 6 Using the Nexus External Displays 6 1 Overview 6 1 6 2 Nexus P40N P41N P43N LED External Display 6 1 6 2 1...

Page 9: ...utput Form C Module 9 11 9 7 1 Overview 9 11 9 7 2 Communication 9 12 9 7 3 Normal Mode 9 12 9 8 Digital Solid State Pulse Output KYZ Module 9 13 9 8 1 Overview 9 13 9 8 2 Communication 9 14 9 8 3 Normal Mode 9 14 9 9 Digital Status Input Module 9 15 9 9 1 Overview 9 15 9 9 2 Communication 9 15 9 9 3 Normal Mode 9 16 9 10 Specifications 9 16 Chapter 10 Nexus Monitor with INP2 Internal Modem Option...

Page 10: ...mance Notes 12 8 Appendix A Transformer Loss Compensation Excel Spreadsheet with Examples A 1 Calculating Values A 1 A 2 Excel Spreadsheet with Example Numbers A 1 Glossary of Terms Electro Industries GaugeTech Doc E107706 V1 25 VIII ...

Page 11: ... back to the transformer that is serving the circuit It is often not possible to conclusively determine the correct circuit connection simply by counting the wires in the service or checking voltages Checking the transformer connection will provide conclusive evidence of the circuit connection and the relationships between the phase voltages and ground 1 1 1 Wye Connection Q The wye connection is ...

Page 12: ...pplications the facility will be fed with a four wire wye service but only three wires will be run to individual loads The load is then often referred to as a delta connected load but the service to the facility is still a wye service it contains four wires if you trace the circuit back to its source usually a transformer In this type of connection the phase to ground voltage will be the phase to ...

Page 13: ...ces one corner of the delta is grounded This means the phase to ground voltage will be zero for one phase and will be full phase to phase voltage for the other two phases This is done for protective purposes Q Another common delta connection is the four wire grounded delta used for lighting loads In this connection the center point of one winding is grounded On a 120 240 volt four wire grounded de...

Page 14: ...log meters this measurement was accomplished using up to three separate elements Each element combined the single phase voltage and current to produce a torque on the meter disk All three elements were arranged around the disk so that the disk was subjected to the combined torque of the three elements As a result the disk would turn at a higher speed and register power supplied by each of the thre...

Page 15: ...rrents into a node is zero Another way of stating the same thing is that the current into a node connection point must equal the current out of the node The law can be applied to measuring three phase loads Figure 1 6 shows a typical connection of a three phase load applied to a three phase four wire service Krichhoff s Laws hold that the sum of currents A B C and N must equal zero or that the sum...

Page 16: ...delivered instantaneous watts is measured as 1 000 watts and the load was served for a one hour time interval then the load would have absorbed one kilowatt hour of energy A different load may have a constant power requirement of 4 000 watts If the load were served for one hour it would absorb four kWh If the load were served for 15 minutes it would absorb of that total or one kWh Q Figure 1 7 sho...

Page 17: ...nt was made over a 15 minute interval To convert the reading to a demand value it must be normalized to a 60 minute interval If the pattern were repeated for an additional three 15 minute intervals the total energy would be four times the measured value or 59 68 kWh The same process is applied to calculate the 15 minute demand value The demand value associated with the example load is 59 68 kWh hr...

Page 18: ... are most used in electrical systems But it is often not sufficient to only measure real power and energy Reactive power is a critical component of the total power picture because almost all real life applications have an impact on reactive power Reactive power and power factor concepts relate to both load and generation applications However this discussion will be limited to analysis of reactive ...

Page 19: ...omers to keep VAR requirements low most utilities impose a penalty if the VAR content of the load rises above a specified value A common method of measuring reactive power requirements is power factor Power factor can be defined in two different ways The more common method of calculating power factor is the ratio of the real power to the apparent power This relationship is expressed in the followi...

Page 20: ...loads Devices such as computer power supplies variable speed drives and fluorescent light ballasts make current demands that do not match the sinusoidal waveform of AC electricity As a result the current waveform feeding these loads is periodic but not sinusoidal Figure 1 10 shows a normal sinusoidal current waveform This example has no distortion Figure 1 10 Nondistorted Current Waveform Q Figure...

Page 21: ... Figure 1 12 Waveforms of the Harmonics The waveforms shown in Figure 1 12 are not smoothed but do provide an indication of the impact of combining multiple harmonic frequencies together When harmonics are present it is important to remember that these quantities are operating at higher frequencies Therefore they do not always respond in the same manner as 60 Hz values Electro Industries GaugeTech...

Page 22: ... are used they effectively filter out higher frequency harmonic distortion making it impossible to see Q However when monitors can be connected directly to the measured circuit such as direct connection to 480 volt bus the user may often see higher order harmonic distortion An important rule in any harmonics study is to evaluate the type of equipment and connections before drawing a conclusion Not...

Page 23: ...ported by the utility system to another adjacent customer Often equipment that is sensitive to power quality problems may in fact also be the cause of the problem Q If a power quality problem is suspected it is generally wise to consult a power quality professional for assistance in defining the cause and possible solutions to the problem Electro Industries GaugeTech Doc E107706 V1 25 1 13 Cause D...

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Page 25: ...al Communicator EXT software allows a user to poll and gather data from multiple Nexus meters installed at local or remote locations see the Communicator EXT User Manual for details On board mass memory enables the Nexus to retrieve and store multiple logs The Nexus Meter with Internal Modem or Network Option connects to a PC via standard phone line or MODBUS TCP and a daisy chain of Nexus Meters ...

Page 26: ...ltiple Protocols see section below on DNP V3 00 Built in RTU functionality Built in PLC functionality 90msec High Speed Updates for Control 2 2 DNP V3 00 Level 1 and Level 2 Nexus 1250 supports DNP V3 00 Level 1 Nexus 1252 supports DNP V3 00 Level 2 DNP Level 2 Features Up to 136 measurement 64 Binary Inputs 8 Binary Counters 64 Analog Inputs can be mapped to DNP Static Points over 3000 in the cus...

Page 27: ...o detect an incoming call When an incoming call is detected the modem will wait a user set number of rings and answer the call Q The modem can be programmed to check for a password on an incoming call If the correct password is not provided the modem will hang up on the incoming call If several unsuccessful incoming call attempts are received in a set time period the modem will lock out future inc...

Page 28: ...heres to IEEE 802 3 Ethernet standard using TCP IP Utilizes simple and inexpensive 100BaseT wiring and connections Plugs right into your network using built in RJ 45 jack Programmable to any IP address subnet mask and gateway requirements Communicates using the industry standard Modbus TCP protocol 2 5 2 Hardware Connection Q Use Standard RJ 45 10 100BaseT cable to connect with the Nexus The RJ 45...

Page 29: ...cations Ports screen click Advanced Settings Click the FTP Client tab on the top of the folder Using FTP you can easily replace any file by using the SAME FILE NAME as the one you want to replace Q Enter the Email Server IP Address The Default Settings store ONE Email Server IP Address for administrative purposes or to send an alarm if there is a problem An ADDITIONAL 8 can be con figured with FTP...

Page 30: ...Wye van vbn vcn ia ib ic in Samples for Delta vab vbc vca ia ib ic Q Root Mean Square RMS of Phase to Neutral Voltages n number of samples For Wye x an bn cn Q Root Mean Square RMS of Currents n number of samples For Wye x a b c n For Delta x a b c Q Root Mean Square RMS of Phase to Phase Voltages n number of samples For Wye x y an bn or bn cn or cn an For Delta xy ab bc ca n v V n t t x RMSx 1 2 ...

Page 31: ...hase For Wye x a b c Q Apparent Power VA per phase For Wye x a b c Q Reactive Power VAR per phase For Wye x a b c Q Power Watts Total For Wye For Delta c b a T W W W W n i v i v W n t C BC A AB T t t t t 1 n i v W n t t x t xn X 1 X XN RMS RMS x I V VA 2 2 x x x Watt VA VAR ...

Page 32: ...For Wye For Delta Q Apparent Power VA Total For Wye For Delta Q Power Factor PF For Wye x A B C T For Delta x T C B A T VA VA VA VA 2 2 T T T VAR W VA x x x VA Watt PF C B A T VAR VAR VAR VAR 2 1 2 n i v I V VAR n t t A t AB RMS RMS T A AB 2 1 2 n i v I V n t t C t BC RMS RMS C BC ...

Page 33: ...monic Distortion THD For Wye x VAN VBN VCN IA IB IC For Delta x IA IB IC VAB VBC VCA Q K Factor x IA IB IC Q Watt hour Wh Q VAR hour VARh cos 1 PF 1 127 2 2 x h x RMS RMS THD h 127 1 2 127 1 2 h x h x h h RMS RMS h KFactor n t hr t T W Wh 1 sec 3600 n t hr t T VAR VARh 1 sec 3600 ...

Page 34: ... This convention records the average arithmetic mean demand for consecutive time intervals usually 15 minutes Example A typical setting of 15 minutes produces an average value every 15 minutes at 12 00 12 15 12 30 etc for power reading over the previous fifteen minute interval 11 45 12 00 12 00 12 15 12 15 12 30 etc Q Rolling Sliding Window Demand Rolling Window Demand functions like multiple over...

Page 35: ...ubinterval 12 10 12 15 As a further refinement we will assume that the next subinterval might have a higher average 120 than the last subinterval As we progress into the subinterval for example up to 12 11 the Predictive Window Demand will be the average of the first two subintervals 12 00 12 05 12 05 12 10 the actual values of the current subinterval 12 10 12 11 and the predistion for the remaind...

Page 36: ...ON4 4 Analog Outputs self powered scalable 20mAON8 8 Analog Outputs self powered scalable Q Analog Transducer Inputs Multiple modules can be used 8AI1 8 Analog Inputs 0 1mA scalable and bidirectional 8AI2 8 Analog Inputs 0 20mA scalable 8AI3 8 Analog Inputs 0 5V DC 8AI4 8 Analog Inputs 0 10V DC Q Digital Dry Contact Relay Outputs Multiple modules can be used 4RO1 4 Relay Outputs 10 Amps 125V AC 30...

Page 37: ...date Time 90 msec Frequency Range Fundamental 20 65 Hz Up to 83rd Harmonic Measuring Capability Dimensions HxWxL 3 4 x 7 3 x 10 5 inches 8 6 x 18 5 x 26 6 centimeters Maximum Power Consumption 40 watts with optional modules and display Nominal Power Consumption Approximately 12 watts without optional modules and display Operating Temperature 40 C to 80 C 40 F to 176 F Auxiliary Output Power Voltag...

Page 38: ...ximately 6 Watts Operating Temperature Range 40 C to 80 C 40 F to 176 F Overall Dimensions HxWxL 2 2 x 4 4 x 4 4 in 5 9 x 11 1 x 11 1 cm 2 11 Nexus P60N Touch Screen Display Specifications Specification Nexus P60N Touch Screen Display Maximum Input Voltage 30V DC Minimum Input Voltage 10V DC Maximum Power Consumption 5 Watts Nominal Power Consumption Approximately 4 5 Watts Operating Temperature R...

Page 39: ...binet Install a switch or circuit breaker nearby label it clearly as the meter s disconnecting mechanism NOTE The Nexus Meter with Internal Modem Option mounts the same way Q Maintain the following conditions Operating Temperature 40 C to 70 C 40 F to 158 F Storage Temperature 45 C to 85 C 49 F to 185 F Relative Humidity 5 to 95 non condensing Electro Industries GaugeTech Doc E107706 V1 25 3 1 Fig...

Page 40: ...Electro Industries GaugeTech Doc E107706 V1 25 3 2 Figure 3 2 2 35 5 96cm 3 40 8 63cm MAX Nexus Meter Mounting Diagram Side View ...

Page 41: ...low for at least a 1 25 inch 3 17cm diameter hole in the back for the cable harness See Chapter 5 for communication and power supply details Q The cable harness brings power to the display from the Nexus 1250 1252 Meter which supplies 15 20V DC The P40N or P41N or P43N can draw up to 500 mA in display test mode Figure 3 3 Nexus P40N LED External Display Mounting Diagrams Nexus P40N Display Front V...

Page 42: ... angle must be considered when mounting Install the P60N at a height and angle that make it easy for the operator to see and access the screen Q For optimum performance maintain the following conditions where the Touch Screen Display is mounted Operating Temperature 0 C to 50 C 32 F to 122 F Storage Temperature 20 C to 70 C 36 F to 158 F Relative Humidity 25 to 65 non condensing Figure 3 4 Nexus P...

Page 43: ...o Industries GaugeTech Doc E107706 V1 25 3 5 Q To bezel mount the P60N cut an opening in the mounting panel Follow above cutout dimensions Q Carefully drop in the P60N with bezel and gasket attached Q Fasten the unit securely with the four 6 32 hex nuts supplied ...

Page 44: ...odules To connect more than four I O modules use an additional power supply such as the EIG PSIO Connect multiple I O modules using the RS 485 side ports Q Six feet of RS 485 cable harness is supplied The cable harness brings power to the display from the Nexus Meter which supplies 15 20V DC at 50 200mA See Chapter 5 for power supply and com munication details Figure 3 7 Nexus I O Modules Mounting...

Page 45: ...augeTech Doc E107706 V1 25 3 7 Figure 3 9 Mounting Bracket MBIO Mounting Bracket MBIO 0 605 1 53cm 2x1 10 2 79cm Y 1 235 3 13cm 1 25 3 17cm Y Per Module 3 41 8 66cm 2 20 5 58cm Nexus I O Modules Mounting Diagram Front View ...

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Page 47: ...wn in the wiring diagrams see section 4 8 The Nexus Meter can handle a maximum voltage of 150V phase to neutral and 300V phase to phase Potential Transformers PTs are required for higher voltages with the standard rating With Option G the direct voltage input is extended to 300V phase to neutral and 600V phase to phase 4 3 Wiring the Monitored Inputs VRef Q The Voltage Reference connection referen...

Page 48: ...nual Note the Phase Relationship between the Current and Voltage they should be in phase Q For a DELTA System Go to the Phasors screen of the Communicator EXT software program The current should be 30 degrees off the phase to phase voltage 4 7 Instrument Power Connections Q The Nexus requires a separate power source To use AC power connect the line supply wire to the L terminal and the neutral sup...

Page 49: ...secondary be sure to enable the option on the CT and PT screen of the Communicator EXT software s Device Profile see the Communicator EXT User Manual for details Control Power Option Suffix 18 60 Volts DC D 90 276 Volts AC DC D2 Figure Description 4 1 4 Wire Wye 3 Element Direct Voltage with 4 CTs 4 2 4 Wire Wye 3 Element with 3 PTs and 4 CTs 4 3 4 Wire Wye 3 Element with 3 PTs and 3 CTs 4 4 3 Wir...

Page 50: ...Electro Industries GaugeTech Doc E107706 V1 25 4 4 Figure 4 1 4 Wire Wye 3 Element Direct Voltage with 4 CTs 0 25 A INPUT ...

Page 51: ...Electro Industries GaugeTech Doc E107706 V1 25 4 5 Figure 4 2 4 Wire Wye 3 Element with 3 PTs and 4 CTs INPUT 0 25A ...

Page 52: ...Electro Industries GaugeTech Doc E107706 V1 25 4 6 Figure 4 3 4 Wire Wye 3 Element with 3 PTs and 3 CTs INPUT 0 25 A ...

Page 53: ...Electro Industries GaugeTech Doc E107706 V1 25 4 7 Figure 4 4 3 Wire 2 Element Open Delta with 2 PTs and 3 CTs 0 25 A ...

Page 54: ...Electro Industries GaugeTech Doc E107706 V1 25 4 8 Figure 4 5 3 Wire 2 Element Open Delta with 2 PTs 2 CTs 0 25 A ...

Page 55: ...Electro Industries GaugeTech Doc E107706 V1 25 4 9 Figure 4 6 3 Wire 2 Element Delta Direct Voltage with 3 CTs 0 25 A INPUT ...

Page 56: ...Electro Industries GaugeTech Doc E107706 V1 25 4 10 Figure 4 7 3 Phase 4 Wire Wye 2 5 Element with 2 PTs 3 CTs 0 25 A INPUT ...

Page 57: ...Electro Industries GaugeTech Doc E107706 V1 25 4 11 Figure 4 8 4 Wire 3 Element Grounded Delta with 4 CTs G Option 0 25 A INPUT ...

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Page 59: ...nother device at a local or remote site The I O modules and the Nexus Display use RS 485 to communicate with the Nexus Meter All RS 485 links are viable for a distance up to 4000 feet 1220 m Ports 1 through 4 on the Nexus 1250 1252 Meter are two wire RS 485 connections operating up to 115 200 baud To use Port 1 for RS 485 set the selector switch to RS 485 see Figure 5 3 Nexus Nexus Nexus Nexus Nex...

Page 60: ...ect via RS 485 to other Nexus Meters in local or remote sites in a daisy chain configuration as depicted below The Nexus Meter with the Internal Modem Option has a unique label Port 2 is labeled Modem Gateway If you are going to use RS 485 to connect multiple Nexus 1250 1252 meters you MUST use the Modem Gateway For more details see Chapter 10 of this manual RJ 11 RS 485 Figure 5 2 RJ 11 Communica...

Page 61: ...other Nexus Meters in local or remote sites in a daisy chain configuration as depicted below The Nexus 1250 1252 Meter with the Internal Network Option has a unique label Port 2 is labeled Ethernet Gateway If you are going to use RS 485 to connect multiple Nexus meters via the net work you MUST use the Ethernet Gateway For more details see Chapter 11 of this manual Figure 5 3 RJ 45 Communication w...

Page 62: ...us port to the same potential as the source It is not an earth ground connection You must also connect the shield to earth ground at one point RT 120 Ohms RT 120 Ohms RT 120 Ohms RT 120 Ohms RT 120 Ohms RT 120 Ohms e Electro Industries GaugeTech Doc E107706 V1 25 5 4 Port 3 Port 4 Figure 5 4 Communication Wiring NOTE You may use ANY port to connect a Nexus Display or RS 485 Master However if you a...

Page 63: ...3 Nexus RS 4 485 Wiring Fundamentals with RT Explanation Nexus RS 485 Ports Ports 1 4 see Figure 5 5 above V Voltage terminals for power connections Use with Nexus I O Modules and the Nexus Displays only The Nexus 1250 1252 Meter supplies 17V DC through the V ter minal connections Note Do not connect these pins to devices that receive power from another source ie a computer or to devices that do n...

Page 64: ...ngth of a network If you are not using an RS 485 repeater the maximum length for cable connecting all devices is 4000 feet 1219 meters RT EXPLANATION Termination Resistors are generally used on both ends of longer length transmission lines The value of the Termination Resistors is determined by the electrical parameters of the cable Use RTs only on Master and Last Slave when connecting multiple me...

Page 65: ...pologies Incorrect Connection Star Star Connection Incorrect The three wires connected in a Star shape on both the and terminals will cause interference problems RS 485 Ports RS 485 Port Tee Connection Incorrect The three wires connected in a T shape on both the and terminals will cause interfer ence problems ...

Page 66: ...ote locations you MUST use Port 2 as a Master and an RS 485 connection The link using RS 485 is viable for up to 4000 feet 1219 meters For more information on the Nexus Meter with the Internal Modem Option see Chapter 10 of this manual 5 6 RJ 4 45 Connection Nexus with Internal Network Option to multiple PC s The Internal Network Option conforms to the IEEE 802 3 10BaseT specification using unshie...

Page 67: ...linking its two terminals and two terminals RS 485 communication is viable for up to 4000 feet 1219 meters Connect the shield to the Ground G terminal on the Master The S terminal on the Nexus is used to reference the Nexus port to the same potential as the source It is not an earth ground connection You must also connect the shield to earth ground at one point NOTE Refer to section 5 3 for inform...

Page 68: ...ses a 2 wire connection you need to add jumper wires to convert the Unicom 2500 to the 2 wire configuration As shown in Figure 5 9 you connect the RX and TX terminals with a jumper wire to make the terminal and connect the RX and TX terminals with a jumper wire to make the terminal Figure 5 8 Unicom 2500 with Connections Figure 5 9 Detail of Jumpers ...

Page 69: ... displays from the Nexus 1250 1252 Meter represented by dashed lines in the figure below RS 485 communication is viable for up to 4000 feet 1219 meters If your cable length exceeds 200 feet you must use a remote power supply such as EIG s PSIO and Connect the shield to the shield S terminal on the Nexus Display port The S terminal on the Nexus is used to reference the Nexus port to the same potent...

Page 70: ...ter Port 3 is factory set to match the Nexus Display s baud rate of 9600 To use a port other than Port 3 you must set the port s baud rate to 9600 using the Communicator EXT software see the Communicator EXT User Manual Insert the other end of the cable into the back of the Nexus P60N Display The connectors fit only one way into the ports Stand Alone Interface Cable Nexus P60N Display Port Figure ...

Page 71: ...s Port 4 see section 5 8 or to connect to another module s male RS 485 side port I O Port use for functions specific to the type of module size and pin configuration varies depending on type of module For more detail refer below to section 5 11 and to Chapter 9 of this manual Figure 5 12 Communication Ports on the Nexus I O Modules I O Port Size and pin configuration vary Female RS 485 Side Port M...

Page 72: ...te power source for example EIG PSIO to supply added power to the group RS 485 communication is viable for up to 4000 feet 1219 meters However if your cable length exceeds 200 feet use the remote power supply and Connect the A and B terminals on the Nexus to the A and B terminals of the female RS 485 port Connect the shield to the shield S terminal The S terminal on the Nexus 1250 1252 is used to ...

Page 73: ...s for I O modules and Nexus displays Refer to the previous section section 5 12 for the steps to determine if you must use an additional power source For programming refer to Chapter 8 of the Communicator EXT User Manual I O MODULES FACTORY SETTINGS AND VA RATINGS MODEL NUMBER 1mAON4 1mAON8 20mAON4 20mAON8 8A11 8A12 8A13 8A14 4RO1 4PO1 8D11 MODULE 0 1mA 4 Analog Outputs 0 1mA 8 Analog Outputs 4 20...

Page 74: ...ned a unique address see the Communicator EXT User Manual Connect the A and B terminals of each Nexus Meter Use jumpers on any RS 485 Master connected at the end of the chain see section 5 5 Connect the shield to the S terminal on each Nexus and to the Ground on the RS 485 Master This connection is used to reference the Nexus port to the same potential as the source It is not an earth ground conne...

Page 75: ...Meters 5 15 Networking Groups of Nexus Meters You may connect up to 31 Nexus 1250 1252 Meters on the same RS 485 bus Each one must be assigned a unique address see the Communicator EXT User Manual Use an RS 485 repeater to network several links of instruments A maximum number of 31 Nexus 1250 1252 Meters may be connected to one repeater A maximum number of 31 repeaters may be included on the same ...

Page 76: ... 1250 1252 Meter PC at office Figure 5 16 Remote Connections RS 232 RS 485 PSTN Public Switched Telephone Network Nexus 1250 1252 Meter Remote Modem NULL Modem Adapter or Null Cable Required RS 232 Local Modem PC at office 5 16 Remote Communication Overview Use modems dedicated or dial up when devices are at great distances EIG recommends using RS 485 wiring with a Modem Manager See section 5 13 R...

Page 77: ...no additional hardware RJ 11 RS 485 Figure 5 17 Remote Connections with Internal Modem Option PC Originate Modem or Internal to PC Daisy Chain Standard Telephone wall to phone cabling can be used This cabling is widely available in many lengths with RJ 11 plugs on each end Plug one end into the Nexus 1250 1252 and the other end into the wall jack ...

Page 78: ...5 Network Connection when devices are at great distances Connections are simple requiring no additional hardware MODBUS TCP over Ethernet 10 100BaseT or 10BaseT RJ 45 Network Daisy Chain MODBUS RTU RS 485 Figure 5 18 Remote Connections with Internal Network Option ...

Page 79: ...odem must be programmed for auto answer and set at a fixed baud rate of 9600 with no Flow Control See section 5 19 and the Communicator EXT User Manual for further details 1 6 5 4 7 20 8 3 2 1 2 3 4 5 6 7 8 20 Pins at Null Modem Female End Pins at Null Modem Male End Figure 5 19 Standard Null Modem Configuration 5 18 Remote Communication RS 4 485 Use any Port on the Nexus 1250 1252 If you use Port...

Page 80: ...essary for the computer to ensure connection with the originate modem Set modem to enable Flow Control This is necessary to communicate with remote modem connected to the Nexus Tell modem to write the new settings to activate profile This places these settings into nonvolatile memory the setting will take effect after the modem powers up Modem Connected to the Nexus Meter the Remote Modem Restore ...

Page 81: ... Up Down C 1 2 3 5 6 7 8 Optional 150V Max for wet contacts 5 21 High Speed Inputs Connection The Nexus High Speed Inputs can be used in many ways Attach the KYZ HS Outputs from other meters for totalizing Attach relaying contacts for breaker status or initiated logging Refer to the Communicator EXT User Manual for information on programming the functionality of these versatile inputs The High Spe...

Page 82: ...frequency If power is lost the unit automatically switches to the internal crystal 3 Modbus Commands Time Synchronization The meter uses Serial Modbus Based Commands to change the date and time of the clock The meter relies upon the Internal Crystal between synchronization intervals This mode is used in conjunction with MV90 4 DNP Line Synchronization The meter uses DNP Protocol Commands to change...

Page 83: ...e Nexus Meter to the terminal of the signal generating device IRIG B Time Signal Generating Device GPS Satellite Connection Figure 5 21 IRIG B Connection Installation 1 Set Time Settings for the meter being installed From Communicator EXT Device Profile Click Time Settings Set the Time Zone and Daylight Savings Select AutoDST or Enable and set dates Click Update Device Profile to save the new sett...

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Page 85: ...and P43N LED External Displays Q The Nexus P40N LED External Display can be used alone or it can serve as the Master for this grouping of displays The P40N prepares the data for the Slave displays the P41N and the P43N Once a second it sends a request to the Nexus meter All necessary data for the Slave displays is returned to the Master display upon this request and the Master sends the data to th...

Page 86: ...here are diagrams of the P41N and P43N Displays with example readings on each screen 6 2 2 Nexus P40N Modes Q The Nexus P40N LED External Display has three modes Dynamic Readings Mode section 6 3 and 6 4 Nexus Information Mode section 6 5 and 6 6 Display Features Mode section 6 7 and 6 8 Q Each Mode is divided into Groups Most Groups are further broken down into Readings Use the MODE button to scr...

Page 87: ...e to Phase Voltages Use the LEFT RIGHT arrows to access the following readings in order Volts AB BC CA Maximum Volts AB BC CA Minimum Volts AB BC CA Q Group 3 Current Use the LEFT RIGHT arrows to access the following readings in order Current A B C Maximum Current Minimum Current Current THD Current Maximum THD Current Minimum THD Current Calculated N Measured N Maximum Current Calculated N Measur...

Page 88: ...mary kVARhr Quadrant 4 Primary Q Group 7 Received Energy Use the LEFT RIGHT arrows to access the following readings in order kWatthr Quadrant 2 Quadrant 3 Primary kVAhr Quadrant 2 Primary kVARhr Quadrant 2 Primary kVAhr Quadrant 3 Primary kVARhr Quadrant 3 Primary Q Group 8 Accumulations Use the LEFT RIGHT arrows to access the following readings in order kI 2 t A kI 2 t B kI 2 t C kV 2 t A kV 2 t ...

Page 89: ...B IC Max THD IA IB IC Min THD IA IB IC 1 Second INc INm 1 Second kVA PF lag Frequency Max kVA Freq Min kVA Freq Max Q1 Total PF Min Q1 Total PF Max Q2 Total PF Min Q2 Total PF Max Q3 Total PF Min Q3 Total PF Min Q4 Total PF Min Q4 Total PF Positive kWatthour Q1 Q4 Positive kVAhr Q1 Positive kVAhr Q2 Positive kVARhr Q1 Positive kVARhr Q2 Positive kVAhr Q4 Positive kVAhr Q3 Negative kVARhr Q4 Negati...

Page 90: ...atios Use the LEFT RIGHT arrows to access the following readings in order PT Ratio CT Ratio Q Group 4 External Display Units Primary Secondary Select either Primary or Secondary units for the External Display using the Communicator EXT software see the Energy Manager User Manual When Primary is selected the Display shows all readings in Primary units based on the user programmed PT and CT Ratios W...

Page 91: ...gs Return To First Reading Return To First Reading 6 6 Navigational Map of Nexus Information Mode Q Use UP DOWN arrows to scroll between groups Q Use LEFT RIGHT arrows to scroll between readings Electro Industries GaugeTech Doc E107706 V1 25 6 7 Return To First Reading Comm Settings Port 4 Comm Settings Port 3 Comm Settings Port 2 Comm Settings Port 1 ...

Page 92: ...the password protection feature has been enabled with the Communicator EXT software you will need to enter a password to reset the energy To do this first press the Enter button Then enter the password one character at a time by pressing on the UP or DOWN arrows Each password character begins as an A Press the UP arrow to increment the character from A Z and then from 0 9 Press the DOWN arrow to d...

Page 93: ...n Protocol Baud Rate Address EIG Use Only EIG Use Only Display Scroll On Off G r o u p s 6 8 Navigational Map of Display Features Mode Q Use UP DOWN arrows to scroll between groups Electro Industries GaugeTech Doc E107706 V1 25 6 9 Lamp Test ...

Page 94: ... and TOU for Current Session and Month using the Reset Button Q All screens have a Main button that returns you to the Main screen below All screens also have a Next button that will take you to the next group of readings Some of the screens have additional navigation buttons to take you to complimentary readings See section 6 10 for a navigational map Q GENERAL PAGE Overview of Real Time Readings...

Page 95: ...ge Readings PH N Volts AN BN CN Touch BACK to return to the Volts main screen Q VOLTS Voltage Readings PH PH Volts AB BC CA Touch BACK to return to the Volts main screen Q AMPS Current Readings Details Real Time Current A B C Maximum Current A B C Minimum Current A B C Current Calculated N Measured N Maximum Current Calculated N Measured N Touch A B C to view Currents Detail Electro Industries Gau...

Page 96: ... Maximum kWatt kVAR CoIn kVAR Block Fixed Window Average Maximum kWatt kVAR CoIn kVAR Predictive Rolling Sliding Window Maximum kWatt kVAR CoIn kVAR Touch R T button to view Real Time Power screen Q ENERGY Accumulated Energy Information Watthr Quadrant 2 Quadrant 3 Primary VAhr Quadrant 2 Primary VARhr Quadrant 2 Primary VAhr Quadrant 3 Primary VARhr Quadrant 3 Primary Watthr Quadrant 1 Quadrant 4...

Page 97: ...ndow kWatth kVARhr kWatth kVARh Coin kVARh Coin kVARh Touch ACCUM to view TOU Accumulations Touch Next Reg to scroll Registers 1 8 and Totals Touch Next Group to scroll Prior Season Prior Month Current Season Current Month Q FLICKER INSTANTANEOUS Time Start Reset Stop Current Next PST PLT Status Active or Stopped Frequency Base Voltage Frequency Touch SHORT TERM or LONG TERM to view other Flicker ...

Page 98: ...the settings for Meters ID 1 to 8 Touch NEXT GROUP to scroll to the next screen which displays the settings for Meters ID 9 to 16 Touch NEXT GROUP again to view settings for Meters ID 17 to 24 and 25 to 32 Q PHASORS Phasor Analysis Phase Angles for Form shown at top of the screen Phase Phase Angle Van bn cn Phase Angle Ia b c Phase Angle Vab bc ca Q WAVEFORM Real Time Graph Channel Va b c Channel ...

Page 99: ...s for the Selected Channel appears Volts AN shown below Touch PREVIOUS LOGS to view other logs Q REAL TIME TRENDING CHANNEL SELECTOR Select Channel by touching a CHANNEL Button The Active Channel appears at the lower right Data from the previously Active Channel will be lost if the Channel is changed The Time Interval for Trending appears at the bottom of the screen To increase the Interval touch ...

Page 100: ...reen go back to original screen Max Min and Demand Hour I2 T and V2 T Counters All Logs TOU for Current Session and Month Q SETTINGS Q LCD SCREEN SETTINGS Contrast Touch Up Down buttons to increase decrease settings Number 37 is optimum setting Backlight Off Delay number of seconds after use that backlight turns off Touch Up Down buttons to increase decrease settings Q NEXUS LINK SETTING Nexus Add...

Page 101: ...al Number 10 digit number Comm State Healthy or Unhealthy Nv Ram 4 MB DSP State Healthy or Unhealthy Protection Password Enabled or Disabled On Time Current Date and Time Q FIRMWARE VERSIONS Nexus 1252 Boot 601 Run time 606 DSP Boot 600 DSP Run time 604 LCD Display AAD This screen displays the current firmware version for the Nexus and the display Electro Industries GaugeTech Doc E107706 V1 25 6 1...

Page 102: ...6 10 Navigational Map for P60N Touch Screen External Display Electro Industries GaugeTech Doc E107706 V1 25 6 18 ...

Page 103: ...rs when the actual ownership change occurs on the high side of the transformer This condition is shown pictorially in Figure 7 1 Q It is generally less expensive to install metering equipment on the low voltage side of a transformer and in some conditions other limitations may also impose the requirement of low side metering even though the actual ownership change occurs on the high voltage side Q...

Page 104: ...t Cal Point Current 2 x LVCU x Full scale Secondary VA Q The Values for LWFE LWCU LVFE LVCU are derived from the transformer and meter information as demonstrated in following sections Q The calculated loss compensation values are added to or subtracted from the measured Watts and VARs The selection of adding or subtracting losses is made through the meter profile when programming the meter The me...

Page 105: ...s derived by clicking the TLC Calculator button on the Transformer Loss screen of the Device Profile or by manually figuring values in section 7 2 1 Calculating Transformer Loss Compensation Percentages Work Sheet Enter the derived values in the Device Profile screen of the Nexus Communicator software values will automatically be entered from the TLC Calculator button Q The Nexus Communicator soft...

Page 106: ...percentages is converting the transformer loss values based on the transformer ratings to the base used by the meter Q Correct calculation of loss compensation also requires knowledge of the meter installation In order to calculate the loss compensation settings you will need the following information regarding the meter and the installation Number of meter elements Potential Transformer Ratio PTR...

Page 107: ...e Self Cooled MVA to 1 Phase kVA by multiplying by 1000 Test Voltage is generally Phase to Phase for three phase transformers Calculate Phase to Neutral Voltage by dividing Phase to Phase Voltage by 3 Calculate Full Load Current by dividing the 1 Phase kW Self Cooled Rating by the Phase to Neutral Voltage and multiplying by 1000 Company Date Trf Manf Calculation by Station Name Trf Bank No Trf Ser...

Page 108: ...e Transformer Voltage and Current by their respective Multipliers The Meter Trf values for Voltage and Current are obtained by dividing the Meter Base values by the TrfIT Secondary values Q Load Loss at Transformer No Load Loss Watts kW 1 Phase kW No Load Loss ______________ No Load Loss VA kVA Exciting Current 1 Phase kVA Self Cooled Rating 100 ______________ ________________ 100 _______________ ...

Page 109: ...ter Value at Transformer Base for each quantity from calculations above Enter Meter Trf Factor value from Base Conversion Factor calculations above Calculate M T Factor with Exponent by raising the M T Factor to the power indicated in the Exp or Exponent column Calculate the Value at Meter Base by multiplying the M T Factor w Exp times the Value at Trf Base Q Loss Watts Percentage Values Meter Bas...

Page 110: ...ulation Calculate Loss at Meter Base by dividing Value at Meter Base by Meter Base kVA and multiplying by 100 Enter calculated Loss Watts values into Nexus meter using Communicator software Quantity Value at Meter Base Meter Base kVA Loss at Meter Base Quantity Loss Watts FE Loss VARs FE Loss Watts CU Loss VARs CU No Load Loss kW No Load Loss kVAR Load Loss kW Load Loss kVAR ...

Page 111: ...y to each day of the calendar year You may create up to 16 different TOU schedules Q Each TOU schedule divides the 24 hour day into fifteen minute intervals from 00 00 00 to 23 59 59 You may apply one of eight different programmable registers eg Peak Off Peak Shoulder Peak to each fifteen minute interval Q The Nexus 1250 1252 Monitor stores accumulations on a seasonal basis up to four seasons per ...

Page 112: ...ndar will be used Q Reset the current accumulations if you replace a calendar in use A reset clears only the current accumulation registers This causes the current accumulations to use the present date as the start and accumulate to the next new end date which will be taken from the new calendar Once stored prior accumulations are always available and can not be reset See the Nexus Communicator Us...

Page 113: ...re 9 2 for wiring detail I O Port used for functions specific to the type of module size and pin configuration vary depending on type of module Reset Button Press and hold for three seconds to reset the module s baud rate to 57600 and its address to 247 for 30 seconds LEDs when flashing signal that the module is functioning Mounting Brackets MBIO used to secure one or more modules to a flat surfac...

Page 114: ...hrough which they interface with other devices The port configurations are variations of the four types shown below Four Analog Outputs Eight Analog Outputs 0 1 1mA and 4 2 20mA 0 1 1mA and 4 2 20mA Eight Analog Inputs Four Relay Outputs 0 1 1mA 0 2 20mA or Four KYZ Pulse Outputs 0 5 5Vdc 0 1 10Vdc or Eight Status Inputs ...

Page 115: ...o the communication pins of the module s Male RS 485 Side Port Follow steps below and see Figure 9 2 below See section 9 3 for details on using multiple I O modules Figure 9 2 Nexus Meter Connected to I O Module RT RT For runs typically longer than 500 feet Male Side Port on Nexus I O Module Nexus 1250 1252 Port 3 or 4 LED s Q NOTE Termination Resistors are only needed with runs typically more tha...

Page 116: ...ale RS 485 port Connect the shield to the shield S terminal The S terminal on the Nexus is used to reference the Nexus port to the same potential as the source It is not an earth ground connection You must also connect the shield to earth ground at one point 2 Put termination resistors at each end connected to the A and B lines RT is 120 Ohms NOTE Refer to section 5 3 for RT Explanation 3 Connect ...

Page 117: ...for details 3 Starting with the left module and using a slotted screw driver fasten the first I O Module to the left Mounting Bracket The left Mounting Bracket is the one with the PEM Fasten the internal screw tightly into the left Mounting Bracket 4 Next slide the female RS 485 port into the male RS 485 side port to connect the next I O module to the left module Fasten together enough to grab but...

Page 118: ...57600 See below for addresses Q Reset Button If there is a communication problem or if you are unsure of a module s address and baud rate press and hold the RESET button for 3 seconds the module will reset to a default address of 247 at 57600 baud rate for 30 seconds This will enable you to interrogate the I O using the Communicator EXT software see the Modbus Communicating I O Modules User Manual...

Page 119: ...olated connection from ground Analog Transducer Signal Output Modules Specifications Accuracy Communication Power Requirement Operating Temperature Maximum Load Impedance RS 485 Modbus RTU 15 20Vdc at 50 200mA Nexus 1250 1252 Unit supports up to 2 Modules 20 to 79 C 4 to 158 F 0 1mA 10k Ω 4 20mA 500 Ω Model Numbers 1mAON4 4 Channel Analog Output 0 1mA 1mAON8 8 Channel Analog Output 0 1mA 20mAON4 4...

Page 120: ...r of processes performed by the modules Both devices 1 Accept new values through communication 2 Output current loops scaled from previously accepted values The 0 1mA module includes one more process in its Normal Mode 3 Read and average the A D and adjust values for Process 2 above Q The device will operate with the following default parameters Address 247 F7H Baud Rate 57600 Baud Transmit Delay ...

Page 121: ... 158 F Maximum Load Impedance 0 1mA 10k Ω 4 20mA 500 Ω Factory Settings Modbus Address 8AI1 0 1mA 136 8AI2 0 20mA 140 8AI3 0 5Vdc 144 8AI4 0 10Vdc 148 Baud Rate 57600 Modbus Address 247 Baud Rate 57600 9 6 1 Overview Q The Analog Input Modules 0 1mA 0 20mA 0 5Vdc and 0 10Vdc are available in 8 channel format Maximum registers per request read or write is 17 registers Q Nexus 1250 1252 Unit supplie...

Page 122: ... Module 1 Reads and averages the A D and adjusts values for process 2 2 Calculates the percentage of Input Value NOTE The percentage value of the Input will be stored in Input Value Registers Registers 04097 04104 Q The device will operate with the following default parameters Address 247 F7H Baud Rate 57600 Baud Transmit Delay Time 0 Q Normal Operation is prevented by a number of occurrences See ...

Page 123: ...tput Module consists of four Latching Relay Outputs In Normal Mode the device accepts commands to control the relays Relay output modules are triggered by limits programmed with the Communicator EXT software See the Communicator EXT User Manual for details on programming limits Q Nexus 1250 1252 Unit supplies power for up to 4 connected Relay Output modules See section 9 2 for power and communicat...

Page 124: ...l operate with the following Default Parameters Address 247 F7H Baud Rate 57600 Baud Transmit Delay Time 20 csec Q Some situations will cause the device to operate with the above Default Parameters See section 9 4 1 for details of Default Mode 9 7 3 Normal Mode Q Normal Mode consists of one process 1 The device accepts new commands to control the relays ...

Page 125: ...uts and accept Read and Write Commands with at least 4 registers of data per command Digital Solid State Pulse Output KYZ Modules are user programmed to reflect VAR hours WATT hours or VA hours See the Modbus Communicating I O Modules User Manual for details on programming the module Q Nexus 1250 1252 Unit supplies power for up to 4 connected KYZ Pulse Output modules See section 9 2 for power and ...

Page 126: ... given channel is completely ignored and no registers are modified If the difference is greater than half of the programmed Rollover Value for a given channel the write does not increment the Residual but does update the Last Value Overflow of the Residual is not prevented 2 The second process occurs in the main loop and attempts to decrement the Residual by the Programmed Energy Pulse Value If th...

Page 127: ... device will operate with the following Default Mode Parameters See section 9 4 1 for details Address 247 F7H Baud Rate 57600 Baud Transmit Delay Time 20 csec 9 9 Digital Status Input Module Digital Status Input Module Specifications Model Number Communication Power Requirement Operating Temperature Voltage Rating Detection Factory Settings Default Settings Reset Button 8DI1 RS 485 Modbus RTU Prog...

Page 128: ...Nexus 1mAON4 4 Analog Outputs scalable bidirectional 1mAON8 8 Analog Outputs scalable bidirectional 20mAON4 4 Analog Outputs scalable 20mAON8 8 Analog Outputs scalable Q Analog Transducer Inputs Multiple modules can be used 8AI1 8 Analog Inputs 0 1mA scalable and bidirectional 8AI2 8 Analog Inputs 0 20mA scalable and bidirectional 8AI3 8 Analog Inputs 0 5Vdc scalable and bidirectional 8AI4 8 Analo...

Page 129: ... expansion port of the Nexus 1250 1252 can be configured with an internal 56K bps modem This gives Nexus Dial In and Dial Out capability without additional hardware This is ideal for small remote applications When the device is configured with INP2 Port 2 becomes a gateway allowing other Modbus based serial devices access to the phone line Additional connections can include a daisy chain of standa...

Page 130: ...0 4 Dial O Out Function Q The Dial Out Function is intended to allow the meter to automatically report certain conditions without user intervention The modem is normally polling the meter to determine if any abnormal or reportable conditions exist The modem checks the following meter conditions and programmed events set in Nexus Communicator to determine if a call should be placed Are any meter se...

Page 131: ...lish a connection from a network to a Nexus with Internal Network Option With the Internal Network Option the Nexus 1250 1252 provides an Ethernet Gateway allowing access to other Modbus RTU devices Additional connections can include a daisy chain of standard Nexus Meters A daisy chain can include up to 31 meters If more are desired the installation of a repeater allows additional meters See secti...

Page 132: ...ocol Q With the Internal Network Option the standard Port 2 on the Nexus 1250 1252 becomes a gateway to allow additional Nexus Meters access via the LAN Simply connect a daisy chain of Nexus Meters together via RS 485 each with its own device address and using the same baud rates With this option you can access any of those instruments via the single LAN connection Q The Internal Network Option al...

Page 133: ... IP Address Q After the above parameters are set Communicator EXT will connect via the network using a Device Address of 1 and the assigned IP Address using the following steps 1 Double click on Communicator EXT icon to open 2 Click the Connect icon in the icon tool bar The Connect screen will appear 3 Click the Network button at the top of the screen The screen will change to one requesting the f...

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Page 135: ...ation by squaring the input voltage scaled to the reference level This simulates the behavior of a lamp Block 3 is composed of a cascade of two filters and a measuring range selector In this implementation a log classifier covers the full scale in use so the gain selection is automatic and not shown here The first filter eliminates the DC component and the double mains frequency components of the ...

Page 136: ...d be used The smoothed values are obtained using the following formulas P 1s P 7 P 1 P 1 5 3 P 3s P 2 2 P 3 P 4 3 P 10s P 6 P 8 P 10 P 13 P 17 5 P 50s P 30 P 50 P 80 3 The 3 second memory time constant in the flicker meter ensures that P 0 1 cannot change abruptly and no smoothing is needed for this percentile Long Term Flicker Evaluation The 10 minute period on which the short term flicker severi...

Page 137: ...e Profile From the Device Profile select Flicker Settings The following screen will appear Electro Industries GaugeTech Doc E107706 V1 25 12 3 Block 1 Block 2 Block 3 Voltage Detector and Gain Control Input Voltage Adaptor Square Law Demodulator High Pass Filter DC Removal Low Pass Filter Carrier Removal Weighting Filter Squaring Multiplier 1st Order Sliding Mean Filter A D Converter Sampling Rate...

Page 138: ...plementation is available and can be selected This implementation is the proposed 60 Hz standard that is still in the approval process Remember the voltage is normalized For 50 Hz the normalized voltage is 230 V and for 60 Hz the normalized voltage is 120 V Press OK when you are finished Press Help for more information on this topic 12 4 Software User Interface Q Main screen From the Communicator ...

Page 139: ... is the normalized voltage for the selected frequency 230 V for 50 Hz or 120 V for 60 Hz Flicker Monitoring Clicking on Stop causes Flicker to stop being processed and freezes all the current values Stop Time is recorded and clears the current Max Min Values Clicking on Start starts Flicker processing Start Time is recorded Clicking on Reset causes the Max Min values to be cleared and restarts the...

Page 140: ...nce the last reset and the time of the last reset The following screen is displayed Q Long Term Readings Click on the Long Term tab to access the Plt readings The screen below displays three groups of Plt values Plt Readings Displayed Current Plt values for Va Vb and Vc and the time of computation Current Plt Max values for Va Vb and Vc since the last reset and the time of the last reset Current P...

Page 141: ...rough the Communications Port Refer to the Nexus Modbus and DNP Mappings for register assignments and data definitions 12 7 Log Viewer From the Communicator EXT Log Viewer screen using the menus at the top of the Log Viewer screen select a meter time ranges and values to access Select Flicker The values and the associated time stamps when the values occurred are displayed in a grid box Use the but...

Page 142: ...Select carefully User settings are stored If Flicker is on and power is removed from the meter Flicker will still be on when power returns This can cause data gaps in the logged data The Max and Min values are stored and are not lost if the unit is powered down Flicker meets the requirements of IEC 61000 4 15 and former IEC 868 Refer to those specifications for more details if needed Operation is ...

Page 143: ...ta into the Excel Spreadsheet The Excel program will calculate the values needed for the Transformer Loss screen of the Device Profile 2 Enter the values into the Device Profile Use the worksheet found in Chapter 7 Three Element Loss Compensation Worksheet to calculate the values by hand Notes under each section will assist you 1 Enter values based on the tranformer manufacturer s test report The ...

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Page 149: ...e Input Pulse When applied to Input Pulse Accumulations the Average refers to the block Accumulations fixed window average value of the input pulses Average Power When applied to power values watts VARs VA the average is a calculated value that corresponds to the thermal average over a specified time interval The interval is specified by the user in the meter profile The interval is typically 15 m...

Page 150: ...average value of power or a similar quantity over a specified period of time Demand Interval A specified time over which demand is calculated Display User configurable visual indication of data in a meter DNP 3 0 A robust non proprietary protocol based on existing open standards DNP 3 0 is used to operate between various systems in electric and other utility industries and SCADA networks Nexus 125...

Page 151: ... modem within the meter s enclosure that connects to the RJ 11 telephone connector Invalid Register In the Nexus Modbus Map there are gaps between Registers For example the next Register after 08320 is 34817 Any unmapped Register stores no information and is said to be invalid ITIC Curve An updated version of the CBEMA Curve that reflects further study into the performance of microprocessor device...

Page 152: ...to a PC the meter can be programmed with Nexus Communicator software Packet A short fixed length section of data that is transmitted as a unit Example a serial string of 8 bit bytes Percent THD Percent Total Harmonic Distortion See THD Protocol A language that will be spoken between two or more devices connected on a network PT Ratio Potential Transformer Ratio used to scale the value of the volta...

Page 153: ...bits per second RS 232 connection can be accomplished using Port 1 of the Nexus 1250 1252 or the Optical Port on the face of the Nexus 1260 1270 RS 485 A type of serial network connection that connects two or more devices to enable communication between the devices An RS 485 connection will allow multi drop communication from one to many points Distance between devices is typically limited to arou...

Page 154: ...PT Ratio Voltage Vab Vab Vbc Vca are all Phase to Phase voltage measurements These voltages are measured between the three phase voltage inputs to the meter Voltage Van Van Vbn Vcn are all Phase to Neutral voltages applied to the monitor These voltages are measured between the phase voltage inputs and Vn input to the meter Technologically these voltages can be measured even when the meter is in a ...

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