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Electro Industries/GaugeTech Nexus 1250, Installation & Operation Manual

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Electro Industries/GaugeTech Nexus 1250 Installation & Operation Manual Download Page 17

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Electro Industries/GaugeTech 

Doc #: E107-7-06-121

2-1

Chapter 2

Chapter 2

Nexus Overview

Nexus Overview

2.1: The Nexus System

2.1: The Nexus System

Electro Industries’ Nexus 1250 combines high-end revenue metering with sophisticated power quality
analysis. Its advanced monitoring capabilities provide detailed and precise pictures of any metered point
within a distribution network. Extensive I/O capability is available in conjunction with all metering 
functions. The optional Nexus Communicator software allows a user to poll and gather data from 
multiple Nexus monitors installed at local or remote locations (see the 

Nexus Communicator User

Manual

for details). On-board mass memory enables the Nexus to retrieve and store multiple logs.  The

Nexus Monitor with Internal Modem (or Network) Option connects to a PC via standard phone line (or
MODBUS/TCP) and a daisy chain of Nexus Monitors via an RS-485 connection.  See 

Chapters 10 and

11

for details.

Figure 2.1:  The Nexus System

Computer
or SCADA

System

Nexus

Display

Expandable I/O Modules

Nexus Monitor

Modem/Ethernet

Option

Modem Gateway or

Ethernet Gateway

RS-485 Connection

Modem/Ethernet

Option

RJ-11 or RJ-45

Connection

Courtesy of NationalSwitchgear.com

Summary of Contents for Nexus 1250

Page 1: ...Installation Operation Manual Revision 1 21 March 20 2001 Doc E107 7 06 121 1800 Shames Drive Westbury New York 11590 Tel 516 334 0870 u Fax 516 338 4741 Sales electroind com u www electroind com The World Leader in Power Monitoring Systems Courtesy of NationalSwitchgear com ...

Page 2: ...e Electro Industries GaugeTech Doc E107 7 06 121 Courtesy of NationalSwitchgear com ...

Page 3: ...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 2001 Electro Industries GaugeTech Printed in the United States of America e Electro Industries GaugeTech Doc E107 7 06 121 i Co...

Page 4: ...itoring The Nexus 1250 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 GAUGETEC...

Page 5: ...ower monitoring products All EIG products are designed manufactured tested and calibrated at our facility in Westbury New York Applications n Multifunction power monitoring n Single and multifunction power monitoring n Power quality monitoring n Onboard data logging for trending power usage and quality n Disturbance analysis Futura Series Products n Power quality monitoring n High accuracy AC mete...

Page 6: ...E Electro Industries GaugeTech Doc E107 7 06 121 iv Courtesy of NationalSwitchgear com ...

Page 7: ...ts and Voltages 4 1 4 2 Fusing the Voltage Connections 4 1 4 3 Wiring the Monitored Inputs VRef 4 1 4 4 Wiring the Monitored Inputs VAux 4 1 4 5 Wiring the Monitored Inputs Currents 4 1 4 6 Isolating a CT Connection Reversal 4 2 4 7 Instrument Power Connections 4 2 4 8 Wiring Diagrams 4 3 Chapter 5 Communication Wiring 5 1 Communication Overview 5 1 5 2 RS 232 Connection Nexus Monitor to a Compute...

Page 8: ...rnal Display 6 9 6 10 Navigational Map for P60N Touch Screen External Display 6 14 Chapter 7 Transformer Loss Compensation 7 1 Introduction 7 1 7 2 Nexus 1250 Transformer Loss Compensation 7 2 7 3 Loss Compensation Percentages 7 3 7 4 Application of Load Loss Compensation Percentages 7 6 7 5 Calculating Transformer Loss Compensation Percentages Work Sheet 7 7 Chapter 8 Nexus Time of Use 8 1 Introd...

Page 9: ...re Overview 10 1 10 2 Hardware Connection 10 2 Chapter 11 Nexus Monitor with Internal Network Option 11 1 Hardware Overview 11 1 11 2 Hardware Connection 11 3 Glossary of Terms e Electro Industries GaugeTech Doc E107 7 06 121 vii Courtesy of NationalSwitchgear com ...

Page 10: ...al Installation Figure 4 1 4 Wire Wye 3 Element Direct Voltage with 4 CTs 4 4 Figure 4 2 4 Wire Wye 3 Element with 3 PTs and 4 CTs 4 5 Figure 4 3 3 Wire 2 Element Open Delta with 2 PTs and 3 CTs 4 6 Figure 4 4 3 Wire 2 Element Open Delta with 2 PT and 2 CTs 4 7 Figure 4 5 3 Wire 2 Element Delta Direct Voltage with 3 CTs 4 8 Figure 4 6 3 Phase 4 Wire Wye 2 5 Element with 2 PTs and 3 CTs 4 9 Figure ...

Page 11: ...ll Readings 6 9 6 13 Chapter 9 Nexus External I O Modules Figure 9 1 I O Module Components 9 1 Figure 9 2 Nexus Monitor Connected to I O Module 9 2 Figure 9 3 Multiple I Os 9 3 Figure 9 4 I O Port on the 4 8 Channel Analog Output Modules 9 6 Figure 9 5 I O Port on the 8 Channel Analog Input Module 9 8 Figure 9 6 I O Port on the Digital Dry Contact Relay Module 9 10 Figure 9 7 I O Port on the Digit...

Page 12: ...e Electro Industries GaugeTech Doc E107 7 06 121 x Courtesy of NationalSwitchgear com ...

Page 13: ...s from line to neutral for lighting and small appliance use The line to line voltage is 240V AC used for higher loads such as water heaters electric dryers ranges and machinery n Power W in a single phase system is E potential I current and cos phase difference between the potential and the current n Power W in a 120 240VAC system is Phase differential between the potential and the current results...

Page 14: ...phase system delivers higher levels of power for industrial and commercial applications the three phases correspond to three potential lines A 120 phase shift exists between the three potential lines A typical three phase configuration has either a Delta connection or a Wye connection In a three phase system the voltage levels between the phases and the neutral are uniform and defined by Real Powe...

Page 15: ...ents required to determine power is N 1 A typical configuration of a poly phase system has either a Delta connection or a Wye connection e Electro Industries GaugeTech Doc E107 7 06 121 1 3 1 4 Consumption Demand and Poor Power Factor 1 4 Consumption Demand and Poor Power Factor n Consumption is the total electric energy usage over a time period expressed in WH W instantaneous power T time in hour...

Page 16: ...m and Harmonics Ideal power distribution has sinusoidal waveforms on voltages and currents In real life applications where inverters computers and motor controls are used distorted waveforms are generated These distortions consist of harmonics of the fundamental frequency n Sinusoidal waveform n Distorted waveform n Percent of Total harmonic distortion of THD n Harmonic distortion is a destructive...

Page 17: ... allows a user to poll and gather data from multiple Nexus monitors installed at local or remote locations see the Nexus Communicator User Manual for details On board mass memory enables the Nexus to retrieve and store multiple logs The Nexus Monitor with Internal Modem or Network Option connects to a PC via standard phone line or MODBUS TCP and a daisy chain of Nexus Monitors via an RS 485 connec...

Page 18: ...o eight programmable tariff registers Counts pulses and aggregates different loads n Nexus 1250 Power Quality Monitoring Records up to 512 samples per cycle on an event Records sub cycle transients on voltage or current readings Measures and records Harmonics to the 83rd order Offers inputs for neutral to ground voltage measurements Synchronizes with IRIG B clock signal n Nexus 1250 Memory Communi...

Page 19: ... The following is a list of the formulas used to conduct calculations n Root Mean Square RMS of Voltages n number of samples n Root Mean Square RMS of Currents n number of samples n Root Mean Square RMS of Phase to Phase Voltages n number of samples n Apparent Power VA n n t t x v 1 2 RMS n n t t x rms i I 1 2 n V xy n t t y t x V 1 2 rms rms I V VA Courtesy of NationalSwitchgear com ...

Page 20: ...ndustries GaugeTech Doc E107 7 06 121 2 4 n Reactive Power VAR n Power Watts n Power Factor PF n Phase Angles x x x VA Watt PF cos 1 PF Watt VA x x x 2 2 VAR samples sample I V W Courtesy of NationalSwitchgear com ...

Page 21: ...6 121 2 5 n Total Harmonic Distortion THD f fundamental h harmonic order n K Factor h harmonic order pu per unit rms current for each of the harmonic frequencies h i 2 2 h I Factor K h pu f h h I I THD 2 2 100 Courtesy of NationalSwitchgear com ...

Page 22: ...tion records the average demand for consecutive time intervals usually 15 minutes For example if the user selects fifteen minute intervals and begins measuring at 12 00 the first window will be from 12 00 to 12 15 the next window will be from 12 15 to 12 30 and so on n Rolling Window Demand Sliding Window The Rolling Window convention divides a fixed time interval into a programmable number of sub...

Page 23: ... Analog Outputs self powered scalable 20mAON8 8 Analog Outputs self powered scalable n Analog Transducer Inputs Multiple modules can be used 8AI1 8 Analog Inputs 0 1mA scalable and bi directional 8AI2 8 Analog Inputs 0 20mA scalable 8AI3 8 Analog Inputs 0 5 VDC 8AI4 8 Analog Inputs 0 10 VDC n Digital Dry Contact Relay Outputs Multiple modules can be used 4RO1 4 Relay Outputs 10 Amps 125 VAC 30 VDC...

Page 24: ...g Method RMS Update 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 70 C 40 F to 158 F Auxiliary Outp...

Page 25: ...emperature Range 40 C to 70 C 40 F to 158 F Overall Dimensions HxWxL 2 2 x 4 4 x 4 4 in 5 9 x 11 1 x 11 1 cm 2 7 Nexus P60N Touch Screen Display Specifications 2 7 Nexus P60N Touch Screen Display Specifications Specification Nexus P60N Touch Screen Display Maximum Input Voltage 30 VDC Minimum Input Voltage 10 VDC Maximum Power Consumption 5 watts Nominal Power Consumption Approximately 4 5 watts O...

Page 26: ...e Electro Industries GaugeTech Doc E107 7 06 121 2 10 Courtesy of NationalSwitchgear com ...

Page 27: ...abinet Install a switch or circuit breaker nearby and label it clearly as the Monitor s disconnecting mechanism NOTE The Nexus Monitor with Internal Modem Option mounts the same way n 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 e Electro Industries GaugeTech Doc E107 7 06 ...

Page 28: ...e Electro Industries GaugeTech Doc E107 7 06 121 3 2 Figure 3 2 2 35 5 96cm 3 40 8 63cm MAX Nexus Monitor Mounting Diagram Side View Courtesy of NationalSwitchgear com ...

Page 29: ... supplied Allow 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 n The cable harness brings power to the display from the Nexus Monitor which supplies 15 20 VDC The P40N can draw up to 500 mA in display test mode Figure 3 3 Nexus P40N LED External Display Mounting Diagrams Nexus P40N Display Front View Nexus P4...

Page 30: ...he viewing 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 n 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...

Page 31: ... Touch Screen Display Bezel Mounting Diagram n To bezel mount the P60N cut an opening in the mounting panel Follow above cutout dimensions n Carefully drop in the P60N with bezel and gasket attached See Figure 3 7 below for details n Fasten the unit securely with the four 6 32 hex nuts supplied Courtesy of NationalSwitchgear com ...

Page 32: ...modules To connect more than four I O modules use an additional power supply such as the EIG Power Brick Connect multiple I O modules using the RS 485 side ports n Six feet of RS 485 cable harness is supplied The cable harness brings power to the display from the Nexus Monitor which supplies 15 20 VDC at 50 200mA See Chapter 5 for power supply and communication details Figure 3 8 Nexus I O Modules...

Page 33: ... 7 06 121 3 7 Figure 3 10 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 Courtesy of NationalSwitchgear com ...

Page 34: ...e Electro Industries GaugeTech Doc E107 7 06 121 3 8 Courtesy of NationalSwitchgear com ...

Page 35: ...agrams see section 4 8 n The Nexus Monitor 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 voltage input is extended to 300V phase to neutral and 600V phase to phase 4 3 Wiring the Monitored Inputs VRef 4 3 Wiring the Monitored Inputs VRef n The Voltage Reference con...

Page 36: ...or User Manual Note the Phase relationship between the Current and Voltage they should be in phase n For a Delta System Go to the Phasors screen of the Nexus Communicator software program The current should be 30 degrees off the phase to phase voltage 4 7 Instrument Power Connections 4 7 Instrument Power Connections n The Nexus requires a separate power source To use AC power connect the line supp...

Page 37: ...r a custom connection diagram Note If you purchased a G Option Nexus for a 300 Volt secondary be sure to enable the option in the CT and PT section of the Nexus Communicator software s Device Profile see the Nexus Communicator User Manual for details Figure Description 4 1 4 2 4 3 4 4 4 5 4 6 4 Wire Wye 3 Element Direct Voltage with 4 CTs 4 Wire Wye 3 Element with 3 PTs and 4 CTs 3 Wire 2 Element ...

Page 38: ...e Electro Industries GaugeTech Doc E107 7 06 121 4 4 Figure 4 1 4 Wire Wye 3 Element Direct Voltage with 4 CTs INPUT 0 25 A Courtesy of NationalSwitchgear com ...

Page 39: ...e Electro Industries GaugeTech Doc E107 7 06 121 4 5 Figure 4 2 4 Wire Wye 3 Element with 3 PTs and 4 CTs INPUT 0 25 A Courtesy of NationalSwitchgear com ...

Page 40: ...e Electro Industries GaugeTech Doc E107 7 06 121 4 6 Figure 4 3 3 Wire 2 Element Open Delta with 2 PTs and 3 CTs INPUT 0 25 A Courtesy of NationalSwitchgear com ...

Page 41: ...e Electro Industries GaugeTech Doc E107 7 06 121 4 7 Figure 4 4 3 Wire 2 Element Open Delta with 2 PTs and 2 CTs INPUT 0 25 A Courtesy of NationalSwitchgear com ...

Page 42: ...e Electro Industries GaugeTech Doc E107 7 06 121 4 8 Figure 4 5 3 Wire 2 Element Delta Direct Voltage with 3 CTs INPUT 0 25 A Courtesy of NationalSwitchgear com ...

Page 43: ...e Electro Industries GaugeTech Doc E107 7 06 121 4 9 Figure 4 6 3 Phase 4 Wire Wye 2 5 Element with 2 PTs and 3 CTs INPUT 0 25 A Courtesy of NationalSwitchgear com ...

Page 44: ... Electro Industries GaugeTech Doc E107 7 06 121 4 10 0 25 A INPUT Figure 4 7 4 Wire 3 Element Grounded Delta with 4 CTs Note To use this diagram you must order a G Unit Courtesy of NationalSwitchgear com ...

Page 45: ...te with another device at a local or remote site The I O modules and the Nexus Display use RS 485 to communicate with the Nexus Monitor All RS 485 links are capable for a distance up to 4000 feet 1220 m Ports 1 through 4 on the Nexus Monitor 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...

Page 46: ... other Nexus Monitors in local or remote sites in a daisy chain configuration as depicted below The Nexus Monitor 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 monitors you MUST use the Modem Gateway For more details see Chapter 10 of this manual RJ 11 RS 485 Figure 5 2 RJ 11 Communication with Internal Mo...

Page 47: ...Nexus Monitors in local or remote sites in a daisy chain configuration as depicted below The Nexus Monitor 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 monitors via the network you MUST use the Ethernet Gateway For more details see Chapter 11 of this manual Figure 5 3 RJ 45 Communication with Interna...

Page 48: ...e 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 E107 7 06 121 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 are using the ...

Page 49: ...ment DCE 5 3 Nexus RS 485 Wiring Fundamentals 5 3 Nexus RS 485 Wiring Fundamentals 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 Monitor supplies 17 VDC through the V terminal connections Note Do not connect these pins to devices that receive power from another source ie a computer or to ...

Page 50: ...ork If you are not using an RS 485 repeater the maximum length for cable connecting all devices is 4000 feet 1219 meters n Connect devices using the diagrams on the following pages A correct connection requires 1 4 watt resistors connected to the and terminals of each device at the end of a straight line bus The line impedance of the cable and the resistor should match Generally a 100 or 120 Ohm r...

Page 51: ...lectro Industries GaugeTech Doc E107 7 06 121 5 7 Correct Connection Figure 5 7 2 Wire RS 485 Connection RS 485 Connection S Twisted Pair RT RT 120 Ohms 120 Ohms V S B A Courtesy of NationalSwitchgear com ...

Page 52: ...ct 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 interference problems Courtesy of NationalSwitchgear com ...

Page 53: ...emote locations you MUST use Port 2 as a Master and an RS 485 connection n The link using RS 485 is capable for up to 4000 feet 1219 meters n For more information on the Nexus Monitor with the Internal Modem Option see Chapter 10 of this manual 5 6 RJ 45 Connection 5 6 RJ 45 Connection Nexus with Internal Network Option to multiple PC s Nexus with Internal Network Option to multiple PC s n The Int...

Page 54: ...the and terminals on the master Provide jumpers on the master linking its two terminals and two terminals RS 485 communication is capable for up to 4000 feet 1219 meters n 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 ...

Page 55: ...cable harness brings 17 VDC to the displays from the Nexus Monitor represented by dashed lines in the figure below RS 485 communication is capable 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 Power Brick model PB1 and Connect the shield to the shield S terminal on the Nexus Display port The S terminal on the Nexus is used to...

Page 56: ...e Nexus Monitor 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 Nexus Communicator software see the Nexus Communicator 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 Disp...

Page 57: ...s Monitor s port 4 see section 5 8 or to connect to another module s male RS 485 side port n 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...

Page 58: ...e if you must use a separate power source for example EIG PB1 Power Brick to supply added power to the group RS 485 communication is capable 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 termi...

Page 59: ... to the previous section section 5 12 for the steps to determine if you must use an additional power source For programming details refer to Chapter 8 of the Nexus Communicator User Manual I O MODULES FACTORY SETTINGS AND VA RATINGS MODEL NUMBER 1mAON4 1mAON8 20mAON4 20mAON8 8A11 8A12 8A13 8A14 4RO1 4PO1 8D11 4RTD1 MODULE 0 1mA 4 Analog Outputs 0 1mA 8 Analog Outputs 4 20mA 4 Analog Outputs 4 20mA...

Page 60: ...nitor must be assigned a unique address see the Nexus Communicator User Manual n Connect the A and B terminals of each Nexus Monitor Use jumpers on any RS 485 Master connected at the end of the chain see section 5 5 n 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 i...

Page 61: ...xus Monitors 5 15 Networking Groups of Nexus Monitors n You may connect up to 31 Nexus Monitors on the same RS 485 bus Each one must be assigned a unique address see the Nexus Communicator User Manual Use an RS 485 repeater to network several links of instruments n A maximum number of 31 Nexus Monitors may be connected to one repeater A maximum number of 31 repeaters may be included on the same ne...

Page 62: ...ure 5 16 Remote Connections RS 232 RS 485 PSTN Public Switched Telephone Network Nexus 1250 Monitor Remote Modem NULL Modem Adapter or Null Cable Required RS 232 Local Modem PC at office 5 16 Remote Communication Overview 5 16 Remote Communication Overview n 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 ...

Page 63: ... hardware RJ 11 RS 485 Figure 5 17 Remote Connections with Internal Modem Option PC Originate Modem or Internal to PC Daisy Chain n Standard Telephone wall to phone cabling can be used This cabling is widely available in many lengths with RJ 11 plugs on each end n Plug one end into the Nexus and the other end into the wall jack Courtesy of NationalSwitchgear com ...

Page 64: ... Connection when devices are at great distances Connections are simple requiring no additional hardware MODBUS TCP over Ethernet 10 BASE T RJ 45 Network Daisy Chain MODBUS RTU RS 485 Figure 5 18 Remote Connections with Internal Network Option Courtesy of NationalSwitchgear com ...

Page 65: ...programmed for auto answer and set at a fixed baud rate of 9600 with no Flow Control See section 5 19 and the Nexus Communicator 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 5 18 Remote Communication RS 485 RS 485 n Use any Port on the Nexus If ...

Page 66: ... is necessary 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 n Modem Connected to the Nexus Monitor the Remote Mod...

Page 67: ...nal 150V Max for wet contacts 5 21 High Speed Inputs Connection 5 21 High Speed Inputs Connection n 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 n Refer to the Nexus Communicator User Manual for information on programming the functionality of these versatile inputs n ...

Page 68: ...RIG B signal generating device connected to the GPS satellite system will synchronize Nexus Monitors located at different geographic locations n Connect the terminal of the Nexus Monitor to the terminal of the signal generating device connect the terminal of the Nexus Monitor to the terminal of the signal generating device IRIG B Time Signal Generating Device Figure 5 21 IRIG B Connection Courtesy...

Page 69: ...t port to operate at 9600 baud using the Nexus Communicator Software see the Nexus Communicator User Manual 6 2 Nexus P40N LED External Display 6 2 Nexus P40N LED External Display n 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 n Each Mode is divided into Groups Most...

Page 70: ...hase 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 n 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 Mea...

Page 71: ...t 4 Primary n 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 n 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 B kV 2 t C n Group ...

Page 72: ...x 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 Q3 Total PF Min Q3 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 Negative kVAR...

Page 73: ...se the LEFT RIGHT arrows to access the following readings in order PT Ratio CT Ratio n Group 4 External Display Units Primary Secondary Select either Primary or Secondary units for the External Display using the Nexus Communicator software see the Nexus Communicator User Manual When Primary is selected the Display shows all readings in Primary units based on the user programmed PT and CT Ratios Wh...

Page 74: ... Reading 6 6 Navigational Map of Nexus Information Mode 6 6 Navigational Map of Nexus Information Mode n Use UP DOWN arrows to scroll between groups n Use LEFT RIGHT arrows to scroll between readings E Electro Industries GaugeTech Doc E107 7 06 121 6 6 Return To First Reading Comm Settings Port 4 Comm Settings Port 3 Comm Settings Port 2 Comm Settings Port 1 Courtesy of NationalSwitchgear com ...

Page 75: ...assword protection feature has been enabled with the Nexus Communicator 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 decr...

Page 76: ...EIG Use Only Display Scroll On Off G r o u p s 6 8 Navigational Map of Display Features Mode 6 8 Navigational Map of Display Features Mode n Use UP DOWN arrows to scroll between groups E Electro Industries GaugeTech Doc E107 7 06 121 6 8 Lamp Test Courtesy of NationalSwitchgear com ...

Page 77: ...All Logs and TOU for Current Session and Month using the Reset Button n All screens have a Main button that will take you back to the Main screen 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 n VOLTS Voltage Readings Details Vol...

Page 78: ...o Real Time Power screen Thermal Window Average Maximum kWatt kVAR CoIn kVAR Fixed Window Average Maximum kWatt kVAR CoIn kVAR Predictive Sliding Window Maximum kWatt kVAR CoIn kVAR n ENERGY Accumulated Energy Information Delivered Energy Received Energy TOU button goes to TOU Register Accumulations screen kWatthr Quadrant 2 Quadrant 3 Primary kVAhr Quadrant 2 Primary kVARhr Quadrant 2 Primary kVA...

Page 79: ...rimary kVARhr Quadrant 4 Primary Register Demand Register 1 8 Accum button goes to TOU Register Accumulation screen Next Reg button displays Registers 1 8 Next Group button displays Prior Season Month Current Season Month Fixed Window kWatth kVARhr kWatth kVARh Coin kVARh Coin kVARh n PHASORS Phasor Analysis Phase Angle Van bn cn Phase Angle Ia b c Phase Angle Vab bc ca n WAVEFORM Real Time Wavefo...

Page 80: ... Touch the screen to change Don t Reset to Reset Touch Reset Now button OK will appear Touch OK to refresh screen go back to original screen Max Min and Demand Hour I2 T and V2 T Counters All Logs TOU for Current Session and Month n SETTINGS 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 ...

Page 81: ...ocol selected Nexus Status Device Type Nexus 1250 Serial 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 Firmware Versions Nexus 1250 Boot Run time DSP Boot DSP Run time LCD Display This screen displays the current firmware version for the Nexus and the display e Electro Industri...

Page 82: ... Navigational Map for P60N Touch Screen External Display 6 10 Navigational Map for P60N Touch Screen External Display e Electro Industries GaugeTech Doc E107 7 06 121 6 14 Courtesy of NationalSwitchgear com ...

Page 83: ...ransformer Loss Compensation TLC is a technique that electrically or computationally accounts for the lost active and reactive power These calculations are based on the formulas below These equations describe the amount of active Watts and reactive Vars power lost due to both iron and copper effects reflected to the secondary Vars Compensation Measured Voltage Cal point Voltage 4 x LVFE x Secondar...

Page 84: ...liding average Watts Vars All energy accumulation registers KYZ output quantities n The Nexus Communicator software allows you to enable Transformer Loss Compensation for Copper Iron both or neither You can enable it to add subtract from delivered received quantities n Nexus 1250 Transformer Loss Compensation Performs calculations on each phase of the meter for every measurement taken Unbalanced l...

Page 85: ...hase Voltage Low Side No Load Loss Watts Load Loss Watts Exciting Current Impedance n Meter characteristics specify the type of meter type class etc as ordered by the customer The information is published in documentation accompanying individual meters The different characteristics are Voltage Transformer Ratio VTR Current Transformer Ratio CTR Meter Secondary Voltage always 120V for Nexus Transfo...

Page 86: ...Volts x VTR Rated Transformer Volts 4 x No Load Loss Vars n The equation for Watt losses due to copper is LWCU Meter Secondary Current x CTR Primary Current at Rated Bank KVA and Test Phase Volts 2 x Load Loss Watts n The equation for Var losses due to copper is LVCU Meter Secondary Current x CTR Primary Current at Rated Bank KVA and Test Phase Volts 2 x Load Loss Vars n Test Phase Voltage and the...

Page 87: ...rs SQRT Load Loss VA 2 Load Loss Watts 2 No Load Loss Vars SQRT No Load Loss VA 2 No Load Loss Watts 2 n Load and No Load Loss VA must be calculated from transformer parameters The equations are given below Load Loss KVA Impedance x Bank KVA Rating No Load Loss KVA Exciting Current x Bank KVA Rating n At this point by working backwards from the Transformer and Nexus Monitor information it is possi...

Page 88: ...ect the computed losses which are carried forward to all registers and energy accumulation values These are reflected back to the primary by uses of the CTR and VTR ratios The equations implemented in the meter are given below Loss WCU LWCU x I Meter Secondary Current 2 x Meter VA Rating 100 Loss WFE LWFE x V Meter Secondary Voltage 2 x Meter VA Rating 100 Loss VCU LVCU x I Meter Secondary Current...

Page 89: ...itor Information Voltage Transformer Ratio VTR ________________ Current Transformer Ratio CTR ________________ Meter Secondary Voltage always 120V for Nexus TLC 120V Meter Secondary Phase Current always 5A for Nexus TLC 5A Losses Due to Iron Losses Due to Iron No Load KVA Losses Exciting Current x Bank KVA Rating ________________ x _______________ No Load Loss Vars SQRT No Load VA Losses 2 No Load...

Page 90: ...tt Losses CU 5 x CTR It Primary 2 x Load Loss Watts KW 5 x ___ ___________ 2 x _______________ Var Losses CU 5 x CTR It Primary 2 x Load Loss Vars KVA 5 x ___ ___________ 2 x _______________ PERCENT COMPENSATION FACTORS Nominal Primary KVA 120V x VTR x 5A x CTR x 3 KVA 120V x _____ x 5A x _____ x 3 LWFE Watt Losses FE KW x 100 Nominal Primary KVA _____________________ x 100 ____________ LVFE VAR L...

Page 91: ...end Holiday to each day of the calendar year You may create up to 16 different TOU schedules n 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 n The Nexus Monitor stores accumulations on a seasonal basis up to four seasons per ...

Page 92: ...and the settings of the new calendar will be used n 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 res...

Page 93: ...dule s male RS 485 side port 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 su...

Page 94: ...ow Refer to sections 5 12 5 13 for the steps to determine if you must use an additional power source such as the EIG Power Brick model PB1 12V RS 485 communication is capable for up to 4000 feet 1219 meters However if your cable length exceeds 200 feet use the additional power supply and Connect the A and B terminals on the Nexus to the A and B terminals of the male RS 485 port Connect the shield ...

Page 95: ...nicator User Manual for details on configuring and programming the I O Modules n Use the male and female RS 485 side ports to attach I O modules together Screw the modules together using the integrated fastening system Attach the mounting brackets to each side of the group to ensure all modules are securely connected Figure 9 3 Multiple I Os Nexus 1250 I Os must use the Nexus Monitor s Port 4 Set ...

Page 96: ...30 seconds This will enable you to interrogate the I O using the Nexus Communicator software see the Nexus Communicator User Manual Model Module Factory Set Address 1mAON4 0 1mA 4 Channel Analog Output 128 1mAON8 0 1mA 8 Channel Analog Output 128 20mAON4 4 20mA 4 Channel Analog Output 132 20mAON8 4 20mA 8 Channel Analog Output 132 8AI1 0 1mA 8 Channel Analog Input 136 8AI2 0 20mA 8 Channel Analog ...

Page 97: ...f the Analog Output Module s I O Port which is used for connection to an interface device Analog Transducer Signal Output Modules Specifications Accuracy Communication Power Requirement Operating Temperature Maximum Load Impedance RS 485 Modbus RTU 15 20 VDC at 50 200mA Nexus Monitor will support up to two modules 20 C to 70 C 4 F to 158 F 0 1mA 10k Ω 4 20mA 500 Ω Model Numbers 1mAON4 4 Channel An...

Page 98: ... 2 OUT 3 OUT 6 OUT 7 OUT 8 OUT 5 OUT 4 Figure 9 4 8 Channel Analog Output Module 0 1mA or 4 20mA I O Port on 4 Channel Analog Output Module Interface Device I O Port on 8 Channel Analog Output Module Interface Device SCADA RTU etc Bottom RESET Top Top Bottom RESET NOTE Dashed lines indicate customer wiring Courtesy of NationalSwitchgear com ...

Page 99: ...AI1 0 1mA 1k Ω 8AI2 0 20mA 100 Ω 8AI3 0 5VDC 1M Ω 8AI4 0 10VDC 1MΩ 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 n The Analog Input Modules 0 1mA 0 20mA 0 5 VDC and 0 10 VDC are available in 8 channel format n The Nexus Monitor supplies power for up to four connected modules See section 9 2 for pow...

Page 100: ...l Analog Input Module Top COM INPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 5 INPUT 6 INPUT 7 INPUT 8 Bottom RESET 8 Channel Analog Input Module 0 1mA 0 20mA 0 5 VDC or 0 10 VDC Interface Device Figure 9 5 NOTE Dashed lines indicate customer wiring Courtesy of NationalSwitchgear com ...

Page 101: ...C or 125VDC SPDT Factory Settings Modbus Address 156 Baud Rate 57600 Default Settings Reset Button Modbus Address 247 Baud Rate 57600 n Relay output modules are triggered by limits programmed with the Nexus Communicator software See the Nexus Communicator User Manual for details on programming limits n The Nexus Monitor supplies power for up to four connected modules See section 9 2 for power and ...

Page 102: ...E107 7 06 121 9 10 NO C NC C NO NC C NO NC C NO NC Digital Dry Contact Relay Module I O Port Output 1 Output 2 Output 3 Output 4 Figure 9 6 I O Port on Digital Dry Contact Relay Module Top RESET Bottom Courtesy of NationalSwitchgear com ...

Page 103: ...Second Modbus Address 160 Baud Rate 57600 Modbus Address 247 Baud Rate 57600 n The Digital Solid State Pulse Output KYZ Modules are user programmed to reflect VAR hours WATT hours or VA hours See the Nexus Communicator User Manual for details on programming the module n The Nexus Monitor supplies power for up to four connected modules See section 9 2 for power and communication details See section...

Page 104: ...ulse Output KYZ Module Figure 9 7 I O Port on Digital Solid State Pulse Output KYZ Module Top RESET Bottom NO C NC C NO NC C NO NC C NO NC Output 1 Output 2 Output 3 Output 4 NOTE Relay contact positions are shown in shelf de energized state Courtesy of NationalSwitchgear com ...

Page 105: ...umulating pulses from external equipment such as power meters water meters etc A user programmable address and functionality afford versatility 9 9 Digital Status Input Module 9 9 Digital Status Input Module Digital Status Input Module Specifications Model Number Communication Power Operating Temperature Voltage Rating Detection Factory Settings Default Settings Reset Button 8DI1 RS 485 Modbus RTU...

Page 106: ... Doc E107 7 06 121 9 14 COM INPUT 1 INPUT 2 INPUT 3 INPUT 6 INPUT 7 INPUT 8 INPUT 5 INPUT 4 Digital Status Input Module I O Port Figure 9 8 I O Port on Digital Status Input Module Top RESET Bottom Courtesy of NationalSwitchgear com ...

Page 107: ...the internal expansion port of the Nexus can be configured with an internal 56K bps modem This gives Nexus dial in capability without additional hardware This is ideal for small remote applications When the device is configured with a modem card Port 2 becomes a gateway allowing other Modbus based serial devices access to the phone line Additional connections can include a daisy chain of standard ...

Page 108: ...tion n The connection using RJ 11 into the Nexus is virtually unlimited since it utilizes a PSTN Public Switched Telephone Network n To connect with other Nexus Monitors in either local or remote locations you MUST use Port 2 as a Master and an RS 485 connection to any port on the remote Nexus n The Address of the remote Nexus MUST be something other than 1 n The link using RS 485 is capable for u...

Page 109: ...ardware is not required to establish a connection from a network to a Nexus with Internal Network Option With the Internal Network Option the Nexus provides an Ethernet Gateway allowing access to other Modbus RTU devices Additional connections can include a daisy chain of standard Nexus Monitors A daisy chain can have up to 31 meters If more are desired the installation of a repeater allows additi...

Page 110: ... Internal Network Option the standard Port 2 on the Nexus becomes a gateway to allow additional Nexus Monitors access via the LAN Simply connect a daisy chain of Nexus Monitors 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 n The Internal Network Option allows multiple simulta...

Page 111: ...After the above parameters are set Nexus Communicator will connect via the network using a Device Address of 1 and the assigned IP Address using the following steps 1 Double click on Nexus Communicator 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 following i...

Page 112: ...cumulations When applied to Input Pulse Accumulations the label Average refers to the 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 minutes So the Av...

Page 113: ...version of the CBEMA Curve that reflects further study into the performance of microprocessor devices The curve consists of a series of steps but still defines combinations of voltage magnitude and duration that will cause malfunction or damage Modbus ASCII Alternate version of the Modbus protocol that utilizes a different data transfer format This version is not dependent upon strict timing as is...

Page 114: ...adrants 1 and 2 The most common load conditions are Quadrant 1 power flow positive VAR flow positive inductive load lagging or positive power factor and Quadrant 2 power flow negative VAR flow positive capacitive load leading or negative power factor RS 232 A type of serial network connection that connects two devices to enable communications between devices An RS 232 connection connects only two ...

Page 115: ... of all harmonic distortion measured equals 3 of the magnitude of the fundamental 60 Ha quantity 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 Vref inpu...

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