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Chapter 11: Electrical Installation

Figure 11.1: Form 9S Wye, no PTs, 3 CTs . . . . . . . . . . . . . . . . . . . . . . 11-3

Figure 11.2: Form 9S Wye, 3 PTs, 3 CTs . . . . . . . . . . . . . . . . . . . . . . 11-4

Figure 11.3: Form 9S 4-Wire Delta, no PTs, 3 CTs . . . . . . . . . . . . . . . . . . 11-5

Figure 11.4: Form 9S 4-Wire Delta, 3 PTs, 3 CTs . . . . . . . . . . . . . . . . . . 11-6

Figure 11.5: Form 9S 4-Wire Delta, no PTs, 2 CTs . . . . . . . . . . . . . . . . . . 11-7

Figure 11.6: Form 9S 4-Wire Delta, 2 PTs, 2 CTs . . . . . . . . . . . . . . . . . . 11-8

Figure 11.7: Form 9S 3-Wire Delta, no PTs, 2 CTs . . . . . . . . . . . . . . . . . . 11-9

Figure 11.8: Form 9S 3-Wire Delta, 2 PTs, 2 CTs . . . . . . . . . . . . . . . . . . 11-10

Figure 11.9: Form 36S 2.5 Element Wye, no PTs, 3 CTs . . . . . . . . . . . . . . . 11-11

Figure 11.10: Form 36S 2.5 Element Wye, 2 PTs, 3 CTs . . . . . . . . . . . . . . . 11-12

Figure 11.11: Form 45S Wye, no PTs, 3 CTs . . . . . . . . . . . . . . . . . . . . 11-13

Figure 11.12: Form 45S Wye, 2 PTs, 3 CTs . . . . . . . . . . . . . . . . . . . . 11-14

Figure 11.13: Form 45S 3-Wire Delta, no PTs, 2 CTs . . . . . . . . . . . . . . . . 11-15

Figure 11.14: Form 45S 3-Wire Delta, 2 PTs, 2 CTs . . . . . . . . . . . . . . . . . 11-16

Figure 11.15: Form 45S 4-Wire Delta, no PTs, 2 CTs . . . . . . . . . . . . . . . . 11-17

Figure 11.16: Form 45S 4-Wire Delta, 2 PTs, 2 CTs . . . . . . . . . . . . . . . . . 11-18

Figure 11.17: Form 9S mounted in an S/A Adapter . . . . . . . . . . . . . . . . . 11-19

Chapter 12: Nexus® 1262/1272 Meter Switchboard Meter

Figure 12.1: 1262/1272 Switchboard Meter, Front View . . . . . . . . . . . . . . . 12-1

Figure 12.2: Front View of the 1262/1272 Switchboard Meter . . . . . . . . . . . . . 12-2

Figure 12.3: Options Label for the 1262/1272 Switchboard Meter . . . . . . . . . . . 12-2

Figure 12.4: Switchboard Meter, Back View . . . . . . . . . . . . . . . . . . . . . 12-3

Figure 12.5: Switchboard Meter, Side View . . . . . . . . . . . . . . . . . . . . . 12-4

Figure 12.6: Switchboard Meter Cutout with Tolerance . . . . . . . . . . . . . . . . 12-5

Figure 12.7: Front Case showing Built-In Screws . . . . . . . . . . . . . . . . . . 12-6

Figure 12.8: Back Angle View of Switchboard Meter . . . . . . . . . . . . . . . . . 12-7

Figure 12.9: Form 9Z Wye, no PTs, 3 CTs . . . . . . . . . . . . . . . . . . . . . 12-8

Figure 12.10: Form 9Z Wye, 3 PTs, 3 CTs . . . . . . . . . . . . . . . . . . . . . 12-9

Figure 12.11: Form 9Z 4-Wire Delta, no PTs, 3 CTs . . . . . . . . . . . . . . . . . 12-10

Figure 12.12: Form 9Z 4-Wire Delta, 3 PTs, 3 CTs . . . . . . . . . . . . . . . . . 12-11

Figure 12.13: Form 9Z 4-Wire Delta, no PTs, 2 CTs . . . . . . . . . . . . . . . . . 12-12

Figure 12.14: Form 9Z 4-Wire Delta, 2 PTs, 2 CTs . . . . . . . . . . . . . . . . . 12-13

Figure 12.15: Form 9Z 3-Wire Delta, no PTs, 2 CTs . . . . . . . . . . . . . . . . . 12-14

Figure 12.16: Form 9Z 3-Wire Delta, 2 PTs, 2 CTs . . . . . . . . . . . . . . . . . 12-15

Figure 12.17: Form 36Z 2.5 Element Wye, no PTs, 3 CTs . . . . . . . . . . . . . . 12-16

Figure 12.18: Form 36Z 2.5 Element Wye, 2 PTs, 3 CTs . . . . . . . . . . . . . . . 12-17

Chapter 14: Flicker

Figure 14.1: Simulation of Eye Brain Response . . . . . . . . . . . . . . . . . . . 14-3

Electro Industries/GaugeTech

Doc # E151701

Содержание Nexus 1262

Страница 1: ... The Leader in Power Monitoring and Control The Leader in Power Monitoring and Control ...

Страница 2: ......

Страница 3: ... Electro Industries GaugeTech Installation Operation Manual Version 1 10 August 5 2008 Doc E151701 V1 10 1800 Shames Drive Westbury New York 11590 Tel 516 334 0870 Fax 516 338 4741 Sales electroind com www electroind com The Leader in Power Monitoring and Control ...

Страница 4: ...Electro Industries GaugeTech Doc E151701 ...

Страница 5: ...ny 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 2008 Electro Industries GaugeTech Nexus is a registered trademark of Electro Industries Gauge Tech Printed in the United States of Ame...

Страница 6: ...ng The Nexus Monitor 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 ...

Страница 7: ...r web accessed power monitoring advanced power quality revenue metering artificial intelligence reporting industrial submetering and substation data acquisition and control EIG s products can be found on site at virtually all of today s leading manufacturers industrial giants and utilities World Leader In fact EIG products are used globally and EIG is accepted as the world leader in power monitori...

Страница 8: ...e Electro Industries GaugeTech Doc E151701 iv ...

Страница 9: ... Revenue Billing Capability 2 4 2 3 2 Advanced Communications and I O Capabilities 2 5 2 3 3 EN50160 Flicker 2 6 2 3 4 Display Screens 2 6 2 3 5 Additional Switches 2 6 2 3 6 Nexus External Output Modules 2 6 2 3 6 1 Optional P40N P41N and P43N LED Remote Displays 2 6 2 3 6 2 Optional P60N Touch Screen Remote Display 2 6 2 4 Nexus 1262 1272 Meter Forms 2 7 2 5 Nexus 1262 1272 Meter Specifications ...

Страница 10: ...Meter to Output Modules 5 12 5 3 11 Steps to Determine Power Needed 5 13 5 3 12 Output Modules Factory Settings and VA Ratings 5 13 5 3 13 Remote Communication Over Telephone Lines Using the RS485 Port 5 14 5 3 14 Programming Modems for Remote Communication 5 16 5 3 15 Selected Modem Strings 5 17 5 3 16 High Speed Inputs Connection 5 17 5 3 17 IRIG B Connections 5 18 5 3 18 Time Synchronization Al...

Страница 11: ...0N Display Modes 9 2 9 3 Dynamic Readings Mode 9 3 9 4 Navigational Map of Dynamic Readings Mode 9 5 9 5 Nexus Information Mode 9 6 9 6 Navigational Map of Nexus Information Mode 9 7 9 7 Display Features Mode 9 8 9 8 Navigational Map of Display Features Mode 9 9 9 9 Nexus P60N Touch Screen External Display and Screens 9 10 9 10 Navigational Map for P60N Touch Screen External Display 9 18 9 11 Opti...

Страница 12: ...11 1 Wiring Diagrams Forms 9S 36S and 45S 11 1 11 2 9S Meter Mounted in S A Adapter 11 19 Chapter 12 Nexus 1262 1272 Switchboard Meter Type Z 12 1 Introduction 12 1 12 2 Labels 12 2 12 3 Specifications and Dimensions 12 3 12 4 Installation 12 6 12 5 Wiring Diagrams Forms 9Z and 36Z 12 7 Chapter 13 Nexus Meter Calculations 13 1 Measurements and Calculations 13 1 13 2 Demand Integrators 13 6 Chapter...

Страница 13: ... Type S Meters Figure 1 1 The Nexus 1272 Meter 1 1 Figure 1 2 The Nexus 1272 Meter Rear View Diagram 1 1 Figure 1 3 Form 9S 36S Aux Terminals 1 1 Figure 1 4 Form 45S Aux Terminals 1 1 Figure 1 5 A7Z Communication Interface 1 2 Chapter 2 Nexus 1262 1272 Meter Overview Figure 2 1 The Nexus 1272 Meter 2 1 Figure 2 2 How the Nexus 1272 Meter Processes Inputs 2 2 Figure 2 3 How the Nexus 1262 Meter Pro...

Страница 14: ...6 9 Figure 6 11 Daisy Chain Meters with the P60N Touch Screen Display 6 9 Figure 6 12 Nexus Output Modules Mounting Diagram Overhead View 6 10 Figure 6 13 Nexus Output Module Communication Ports 6 10 Figure 6 14 Nexus Output Modules Mounting Diagram Front View 6 11 Figure 6 15 Nexus Output Modules with PSIO Mounting Diagram 6 11 Figure 6 16 Output Wiring Detail 6 12 Chapter 8 Transformer Loss Comp...

Страница 15: ...exus 1262 1272 Meter Switchboard Meter Figure 12 1 1262 1272 Switchboard Meter Front View 12 1 Figure 12 2 Front View of the 1262 1272 Switchboard Meter 12 2 Figure 12 3 Options Label for the 1262 1272 Switchboard Meter 12 2 Figure 12 4 Switchboard Meter Back View 12 3 Figure 12 5 Switchboard Meter Side View 12 4 Figure 12 6 Switchboard Meter Cutout with Tolerance 12 5 Figure 12 7 Front Case showi...

Страница 16: ... Figure C 5 Phasor diagram showing Three phase 4 wire Delta Connected System C 4 Figure D 6 Three Phase Wye Load C 5 Figure C 7 Power Use Over Time C 6 Figure C 8 Energy Use and Demand C 8 Figure C 9 Voltage and Complex Current C 9 Figure C 10 Nondistorted Current Waveform C 10 Figure C 11 Distorted current wave C 11 Figure C 12 Waveforms of the Harmonics C 11 Tables Table 6 1 Cable Color Key 6 4 ...

Страница 17: ... s Initial Profile for editing Before making changes click SAVE to Save the Initial Settings as Initial Settings NPS on hard drive Click on the icon double click on the selected parameter The screen appears Make changes Click OK Then use buttons at the bottom of the screen to UPDATE DEVICE SAVE LOAD print a REPORT or CANCEL Section 1 5 reviews screens SAVE the new NPS File as Modified Settings NPS...

Страница 18: ...Demand Integration Click OK Display Configuration Screen Assignments Use pull down windows to set up Display Modes Screens Power Quality Alarm Settings Limits Double click on a column or setting change setting Click OK Waveform CBEMA Profile PQ Thresholds Triggers for waveforms are set here based on a percentage of Full Scales set on the Limit Waveform Full Scales screen Set Sampling Rate and Tota...

Страница 19: ...wn in the white block under the display Fig 1 1 See Figures 1 3 1 4 to determine terminals For Form 9S 36S and 39S meters connect appropriate power to the one of the three left most and to the right most voltage terminals center row of smaller terminals They are small bold terminals in Figure 1 3 The large terminals are current terminals for these Forms NOTE Form 39S uses the same voltage terminal...

Страница 20: ...plication The Nexus meter is shipped with Initial settings that allow it to operate Programming consists primarily of modifying the Initial settings Device Profile as necessary The key steps to programming a Nexus meter are 1 Setting up communications 2 Entering site information CT and PT ratios 3 Setting limits 4 Selecting items to be displayed 1 3 Install Communicator EXT Software Connect See se...

Страница 21: ...ary Device Profile screens SAVE the new NPS File as Modified Settings NPS or as a unique name to identify the file Unique System ID or Customer s Name for example To implement changes click UPDATE DEVICE To LOAD a new or different file select a file name RESET ALL LOGS in Main screen Tools Reset 1 5 Device Profile Screens Q General Settings CT and PT Ratios and System Hookup Any change to CT setti...

Страница 22: ... Savings Time Settings and Line Synchronization Settings See Chapter 4 of the Communicator EXT User Manual for details Communications Settings Ports 1 and 4 are programmable Port 4 is INITIALLY SET for External Devices and can be changed For Internal Modem INP2 and Network INP200 options set Advanced Settings and Dial Out Profile For INP202 the INP202 Tab on the Advanced Settings screen accesses a...

Страница 23: ...tion Assign Screens Use pull down windows to set up Display Modes Screens Q Power Quality Alarm Settings Limits Double click on a column or setting change setting Click OK Waveform CBEMA Profile Triggers for waveforms are set here based on a percentage of Full Scales set on the Limit Waveform Full Scales screen Set Sampling Rate and Total Captures Click OK ...

Страница 24: ...napshot and Channel Click Add or Remove A running Total of Bytes Used appears on the screen Click OK See Chapter 4 of the Communicator EXT User Manual for details 1 5 1 Save the New Program Click the SAVE Button on the Device Profile screen and give your new program an identifiable name 1 6 Field Installation You now have a tested meter with a program for the site where it will be installed Meter ...

Страница 25: ...ed continuously every cycle Values of voltage current and power are pro duced every three cycles and every second Figure 2 2 illustrates the key processes operating within the Nexus 1272 meter The meter allows for four types of inputs and can provide outputs to an integrated display pulse outputs and several communication ports Nexus 1262 meter processses are illustrated in Figure 2 3 Voltage and ...

Страница 26: ...ronization All readings and logs are time stamped to the nearest millisecond Eight status channels provide input of status or pulse signals Status inputs are date time stamped to the nearest millisecond and placed in the event log Pulse inputs are multiplied by a user supplied factor and accumulated in reading registers These accumulated values can also be totalized This feature makes the Nexus 12...

Страница 27: ...hat uses line frequency to synchronize the meter time to standard universal time The Line Synchronization Feature may be Enabled or Disabled If this feature is not Enabled the Internal Clock provides the time sychronization All readings and logs are time stamped to the nearest millisecond Meter setup parameters and all historical log data are stored in nonvolatile RAM The user has multiple log fun...

Страница 28: ...nd Continuous Cumulative Demand Q Load Aggregation Universal Metering Using standard pulse inputs the Nexus 1262 1272 meter can count pulses from external meters and accumulate usage The pulse inputs can be used to totalize electrical usage and utility values such as water or gas use data Readings include 8 Pulse Inputs Individual Accumulating Registers 4 Totalizing Registers Totalize with Nexus m...

Страница 29: ...aions The Nexus 1262 1272 meter allows you to select an additional port for one of the following uses INP2 Internal 56k Modem with noise rejection INP200 Internal Ethernet TCP IP 10 100BaseT with multiple sockets and Modbus TCP INP202 Combination 56k Modem and Internal Ethernet TCP IP 10 100BaseT Q Standard Internal I O Extensive I O capability is available in conjunction with all metering functio...

Страница 30: ...rds The Mode Switch magnetic reed switch uses a magnet to switch operating modes The Test Button The Reset Button 2 3 6 Nexus External Output Modules A variety of optional analog or digital Output modules mount externally to the Nexus 1262 1272 Socket Meter The Nexus 1262 1272 Unit DOES NOT SUPPLY POWER TO Output Modules Use a power supply such as EIG PSIO to power optional Output Modules See Chap...

Страница 31: ...rresponding Wiring diagrams and Appendix B for Blade configurations The Switchboard Meter offers two supported Z Based Forms 9Z and 36Z see Chapter 12 Q NOTE Form 45S replaces Form 5S and may also be used in 4 wire circuits Nexus 1262 1272 Meter Forms NOTE See Section 2 5 for Rated Voltages Nexus 1262 1272 Meter Accuracy Form Hookup 9S 3E Wye or Delta 36S 2 1 2E Wye 45S 2 1 2E Wye or 4W Delta Valu...

Страница 32: ...Q Frequency 45 62 Hz Q Burden Sense Inputs Voltage Inputs 0 33VA 576V Current Inputs 0 0125VA 25A Q Isolation All inputs and outputs isolated to 2500 Volts Com Ports isolated from each other to 1000 Volts Q Sensing Accu MeasureTM Technology 2x16 bit A D converter 1272 1x16 bit A D Converter 1262 True RMS 8 Channel Sample and Hold Q Memory All meter setup parameters measurements and logs contained ...

Страница 33: ...is powered by 3 Phase Voltage Sense Inputs 96 to 550 Vac 50 60Hz 576Vac absolute maximum Autoranging 3 Phase Power Supply Meter power requirement 3VA Phase 120Vac worst case Meter power provided by any of the 3 Phase voltage sources being monitored Q Aux Power Supply Option Unit is powered by Aux Pigtail Wire Select Power Supply Option SE in ordering information Input Voltage 102 to 270V AC DC 50 ...

Страница 34: ...adbands can be set on a per point basis Freeze Commands Freeze Freeze No Ack Freeze4 with Time Freeze with Time No Ack Freeze with Time Commands enable the Nexus meter to have internal time driven Frozen and Frozen Event data When the meter receives the Time and Interval the data will be created For complete details download the appropriate DNP User Manual from our website www electroind com Model...

Страница 35: ... Options Label see next page Electro Industries GaugeTech Doc E151701 3 1 Figure 3 1 Nexus 1272 Meter Nameplate Q KEY The numbered list below acts as a key for the label above 1 Multiply by Constant 6 Test Amperes 2 Voltage Transformer Ratio or PT Ratio 7 Watt hour test constant 3 Current Transformer Ratio see Glossary 8 ANSI C12 20 Form Number 4 Primary Watt hour constant 9 ANSI C12 20 Accuracy C...

Страница 36: ... RAM A Advanced 4M of RAM A Advanced 2M of RAM Output Modules 1mAON4 4 Analog Outputs 0 1mA 1mAON8 8 Analog Outputs 0 1mA 20mAON4 4 Analog Outputs 4 20mA 20mAON8 8 Analog Outputs 4 20mA 4RO1 4 Relay Outputs 4PO1 4 Solid State Pulse Outputs Communication Options INP2 Dial Out Option INP200 Ethernet 10 100BaseT INP202 Ethernet Modem Combination EIG Number Model Number plus Option Numbers Example bel...

Страница 37: ...left side of the face The Optical Port facilitates infrared communication with the meter Using an A7Z Communication Interface or other ANSI C12 13 Type II magnetic optical Communications coupler and an RS232 cable from the A7Z to a PC you can program the meter with Communicator EXT software An Infrared Test Pulse is located on the upper left side of the face Energy pulsing applications can be conf...

Страница 38: ...icked into place properly If the batteries are not low NO INDICATOR will appear See installation instructions in sections 6 2 and 6 2 1 Q Test Mode Wh Test Same as kWh screen except in Wh instead of kWh VARh Test Same as kVAR screen except in VARh Quadrants VAh Test Same as kVAh screen except in VAh Quadrants Watt Rolling Demand Test Delivered and Received Watt Block Demand Test Delivered and Rece...

Страница 39: ...Electro Industries GaugeTech Doc E151701 3 5 3 4 Nexus 1262 1272 Meter Programmable Display Navigation Map ...

Страница 40: ...ary mode The other modes View Mode 2 and View Mode 3 are accessed by swiping the Mode Switch twice Test Mode is accessed by removing the cover POWER MUST BE OFF powering up the meter and pushing the Test Button at any time View Mode 2 and View Mode 3 will automatically return to View Mode 1 after a user set amount of time without any action Test Mode will automatically return to View Mode 1 after ...

Страница 41: ...on for each mode using the Line 1 and Line 2 Description fields 4 Click the Screen Assignments tab a Double click on the screen you want to change b Enter up to 16 screens under each mode on the screen Your Label for each mode will appear at the top of each column 5 Click the Power and Energy Display tab Enter settings for Power and Energy Number of Digits 4 9 Primary Power Decimal Point Location ...

Страница 42: ...me of Use Demand Block Rolling or Cumulative Date Format Month Day Year or Day Month Year Optical Port Settings Baud Rate 1200 2400 4800 9600 19200 38400 or 57600 Optical Receive Non Inverted or Inverted User Inactivity Time Outs number of minutes since last user action when Mode reverts to View Mode 1 Settings are 5 to 60 minutes with 1 minute intervals Leave Test Mode After _ Minutes Reverts wit...

Страница 43: ...power is flowing a solid block is displayed 2 An animated arrow pointing RIGHT indicates positive power flow 3 An animated arrow pointing LEFT indicates negative power flow 4 Modifiers enhance the flexibility of some screens See section 3 7 1 Below is a list of available screens with some example screens Screen Screen Number Name 1 Wh Delivered 2 Wh Received 3 VARh 4 VARh 5 VAh 11 Rolling W Demand...

Страница 44: ... per Quadrant Modifier 1 72 VAh per Quadrant Modifier 1 73 Wh per Quadrant Modifier 1 74 Qh Modifier 3 75 Cumulative Demand Modifier 2 76 Rolling Window Demand Modifier 4 77 Block Window Demand Modifier 4 78 Power Factor per Phase Modifier 6 79 Power Factor per Quadrant 80 TOU Wh Rec Modifier 5 81 TOU VAh Q1 Modifier 5 82 TOU VARh Q1 Modifier 5 83 TOU VAh Q4 Modifier 5 84 TOU VARh Q4 Modifier 5 85...

Страница 45: ...ison Electric Institute 701 Pennsylvania Avenue N W Washington D C 20004 2696 4 1 Testing Tools Q The Nexus 1262 and 1272 meters are equipped with a light emitting diode LED for calibration and a liquid crystal display with test screens These two standard features provide user interface and equipment interface points for meter testing 4 1 1 Test Pulse LED Q The Test Pulse LED is located in the upp...

Страница 46: ...cludes three phase voltage annunciators These annunciators are labeled A B and C to indicate the presence of voltage on the indicated phase If voltage is not present on one phase its indicator will not be displayed These indicators also show whether current is flowing on the indicated phase If no current is flowing on a phase the annunciator will blink When current is flowing it will show a contin...

Страница 47: ...Both CTPT and Transformer Loss No Compensation CTPT Only Exit Do Not Enter Test Mode Stop on the desired screen Then push the Test Button for 2 3 seconds The Test Mode screens appear unless you selected Exit Test will now appear in the upper right corner of the display Q Upon entering Test Mode 1 All energy demand and TOU values are stored in the meter s nonvolatile memory 2 Meter log recording is...

Страница 48: ... The following table shows the display screens available in Test Mode the data displayed on each screen and the pulse source for each screen Q Adjacent to the Test Button T is the Reset Button R A Test Reset is initiated by pressing and releasing the Reset Button while in Test Mode A Test Mode Reset causes all test quantities to be reset to zero and a new block interval to be started The item disp...

Страница 49: ... Communications Port 1 are available for communication with the meter Q In Test Mode you can preset the values of the energy readings that will be restored to the meter when Test Mode is exited using Communicator EXT see following section 4 2 4 or Chapter 4 of the Communicator EXT User Manual for instructions 4 2 3 Test Mode Preset Accumulators There are two reasons to use the Preset Accumulators ...

Страница 50: ...e Q Exit Test Mode in one of the following three ways 1 Pressing and holding the Test Button for more than 3 seconds 2 By the Test Mode Time Out Timer if no load is present 3 By the Extended Test Mode Time Out Timer if load is present These options are explained further in the following sections Q Pressing the Test Mode Button for more than three seconds ends Test Mode and returns the meter to Nor...

Страница 51: ...rrent subinterval are zeroed Upon returning to Normal operating mode a TOU meter or demand meter with load profiling will complete the time remaining in the current partial subinterval so that subsequent subintervals will be synchronized with the hourly boundary Q Maximum demand values for each demand integration type are not modified while in Test Mode The previously recorded maximums are restore...

Страница 52: ...e Electro Industries GaugeTech Doc E151701 4 8 ...

Страница 53: ...ce at a local or remote site The Output modules and external displays use RS485 to communicate with the meter All RS485 links are viable for up to 4000 feet 1220 m The Nexus Socket Meter s Ports 1 and 4 are two wire RS485 connections up to 115 200 baud Optional Communication Connections for INP2 Internal Modem with Dial In Dial Out INP200 10 100BaseT connection or INP202 Combination Modem and Ethe...

Страница 54: ...e A7Z Communication Interface and similar ANSI Type II Magnetic Communication Interfaces See Figure 5 3 One end of the magnetic interface simply snaps onto the optical port the magnet keeps it in place The other end is an RS232 connection Insert that end into a 9 pin serial port on a computer or other device The A7Z requires no power supply All power is received from the host computer serial port ...

Страница 55: ...th ground connection You must also connect the shield to earth ground at one point Do not connect the shield to ground at multiple points it will inter fere with communication A B Two wire RS485 communication terminals Connect the A terminal of the Meter Port to the terminal of the device Connect the B terminal of the Meter Port to the terminal of the device RS232 Connection Magnetic Coupler ...

Страница 56: ...ces converters or terminal strips Include all segments when calculating the total cable length of a network If you are not using an RS485 repeater the maximum length for cable connecting all devices is 4000 feet 1219 meters For an RS485 Daisy Chain connection in which you link multiple devices in a series connect shield to RS485 Master and individual devices as shown in Figure 5 5 You may also con...

Страница 57: ...are using pigtails or if you have any question about which connector is which NOTE RT EXPLANATION Termination Resistors RT 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 Termination Resistors are only needed with runs typically more than 500 feet as the meter has some level of termin...

Страница 58: ...ologies Incorrect Connection Star Star Connection Incorrect The three wires connected in a Star shape on both the and terminals will cause interference problems RS485 Ports RS485 Port Tee Connection Incorrect The three wires connected in a T shape on both the and terminals will cause interfer ence problems ...

Страница 59: ...strates the Unicom 2500 connections for RS485 Figure 5 8 Detail of Jumpers Figure 5 7 Unicom 2500 with Connections The Unicom 2500 can be configured for either 4 wire or 2 wire RS485 connections Since the Nexus meter uses 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 8 you connect the RX and TX terminals with a jumper w...

Страница 60: ... RJ 45 connector is supplied with the meter Cable 6 Using this LAN connection allows multiple PC s to access the meter concurrently The RJ 45 line is inserted into the RJ 45 connector on Cable 6 coming from the back of the meter with the Ethernet Option The connection using RJ 45 into the meter connects the meter to a network using Modbus TCP protocol over Ethernet For more information on a meter ...

Страница 61: ...rce such as the EIG PB1 12VO See Figure 5 7 for wiring details RS485 communication is viable for up to 4000 feet 1219 meters Be sure to do the following Connect the shield to the shield S terminal on the Display port The S terminal on the meter is used to reference the meter s port to the same potential as the source It is not an earth ground connection You may also connect the shield to earth gro...

Страница 62: ...ons for the P40N in section 5 3 7 and follow the wiring diagram in Figure 5 7 The only difference between the two displays is that the port on the P60N is in the lower right hand corner of the back of the display not in the center of the back as shown below Touch Screen Display Port Figure 5 10 P60N Touch Screen Display Port P60N Touch Screen Connection Key LCD Meter 5 DCIN 12 30Vdc 4 GND V V 3 48...

Страница 63: ... section 5 3 6 or to connect to another module s female RS485 side port Output 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 3 10 and to Chapter 10 of this manual Figure 5 11 Communication Ports on the Output Modules Output Port Size and pin configuration vary Female RS485 Side Port Male ...

Страница 64: ...0 2 1 for PSIO details Follow the wiring diagram below and be sure to Connect the A and B terminals on the meter to the A and B terminals of the female RS485 port Connect the shield to the shield S terminal The S terminal on the meter is used to reference the meter s port to the same potential as the source It is not an earth ground connection You may also connect the shield to earth ground at one...

Страница 65: ...s Factory Settings and VA Ratings All Output modules are shipped pre programmed with a baud rate of 57600 and individual address es The table below details the factory set address for each module and the VA Ratings for Output modules and displays Refer to the previous section Section 5 3 11 for the steps to determine the power required For programming details refer to the accompanying Communicator...

Страница 66: ...te Modem RS232 to RS485 Converter Modem Manager Recommended Nexus 1262 1272 Meter PC at office Figure 5 13 Remote Connections RS485 5 3 13 Remote Communication Over Telephone Lines Using the RS485 Port Use modems dedicated or dial up when devices are at great distances We recommend using RS485 wiring with a Modem Manager Remote Connection RS485 ...

Страница 67: ...ator EXT User Manual for instructions You must use an RS485 to RS232 converter and a Null Modem EIG recommends using its Modem Manager This converter has a built in null modem and also provides line data buffering making the telephone line communication reliable most commercial modems do not For this reason EIG recommends the Modem Manager to alleviate any communication line errors that might occu...

Страница 68: ...This 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 Meter 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 meter the Remote Modem Res...

Страница 69: ...aud DIP switch setting Up Up Down Down Up Up Up Down USRobotics Sportster 56K Faxmodem AT F0 W0Y0 DIP switch setting Up Up Down Down Up Up Up Down 5 3 16 High Speed Inputs Connection The High Speed Inputs can be used in multiple ways 1 Attach the KYZ pulse outputs from other meters for pulse counting and totalizing 2 Attach status contacts from relays breakers or other devices for status or wavefo...

Страница 70: ... tips that will help you Figure 5 15 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 Time Click Update Device Profile to save the new settings See Communicator EXT User s Manual 2 Before connection make sure that the meter is set to the right year IRIG B does not supply ...

Страница 71: ...nabled or Disabled for use instead of IRIG B If Line Synchronization is Enabled and power is lost the Internal Clock takes over at the precise moment power is lost Internal Clock All Nexus meters are equipped with Internal Clocks which can be used if IRIG B is not connected and or Line Sync is not Enabled If either of the above Time Sync Tools fails the Internal Clock will take over at the precise...

Страница 72: ...e connection for your phone A standard telephone RJ 11 plug can connect the meter to a standard PSTN Public Switched Telephone Network The phone jack is the override of the modem function when the phone is in use With the device configured with the INP2 Option the meter has dial in capability and provides remote access to other Modbus based serial devices via the meter s RS485 Gateway over your ph...

Страница 73: ...modem will play the string to the host computer upon connection to identify the meter to the host software Refer to the Communicator EXT User Manual for programming details Q The modem includes a connection for an external 3V Lithium Battery with custom leads and velcro mounting to power the modem if the meter loses control power Using the battery the modem will be able to complete a reporting cal...

Страница 74: ...rdware Connection Q Use Standard RJ 45 10 100BaseT cable to connect with the Nexus meter The RJ 45 line is inserted into the RJ 45 Port coming from the back of the meter with the INP200 Ethernet Option Q To configure the Network settings use the following steps 1 Using Port 1 Port 4 RS485 connection or the optical port connect a PC to the meter An RS232 RS485 Converter may be required Example Elec...

Страница 75: ...nicator EXT always communicates Modbus TCP which is the default protocol for Nexus meters NOTE Nexus meters do not support web pages email FTP or DHCP communication 5 6 INP202 Ethernet Modem Combination Q The INP202 Option is an extension of INP200 It has all the features of INP200 plus a built in modem The communication protocol supported by the modem is Modbus ASCII The communication protocol su...

Страница 76: ... menu click General Settings Communications one of the ports You will see the Device Profile Communications Settings screen 2 In the Network Settings section enter data provided by your systems manager IP Address 10 0 01 Example Subnet Mask 255 255 255 0 Example Default Gateway 0 0 0 0 Example Computer Name NETWORK Example Q After the Network parameters are set Communicator EXT will connect to the...

Страница 77: ... are installing is in fact the correct form factor and service type Make sure that the socket and meter current class ratings are compatible Make sure that all communication and auxiliary power wiring is accessible in case disconnection is required for any reason Before applying power to the meter install batteries if not installed at the factory and check the connections if they are installed POW...

Страница 78: ... supplied All Nexus Socket meters are wired like the meter pictured below Make sure the meter is functioning properly by running it through a test circuit The Nexus Socket meter has its own display built into the face of the meter However you may want to install additional displays in remote locations Following are installation proce dures for the Nexus P40N P41N P43N and P60N displays Installatio...

Страница 79: ...tries GaugeTech Doc E151701 6 3 Figure 6 3 Nexus 1262 1272 Meter Mounted in A Base Bottom Figure 6 4 Nexus 1262 1272 Meter A Base Side View 4 57 116 1 mm 6 84 173 7mm 10 4 264 2mm 0 87 22 1 mm 2 02 51 3mm 6 60 167 6mm ...

Страница 80: ...able 3 NORMALLY OPEN 3 NORMALLY CLOSED 4 COMMON NORMALLY OPEN 4 COMMON NORMALLY CLOSED 3 NORMALLY OPEN 2 COMMON NORMALLY CLOSED 2 NORMALLY OPEN 1 COMMON NORMALLY CLOSED 1 Optional KYZ Output COMMON INPUT 1 INPUT 2 INPUT 3 INPUT 4 INPUT 5 INPUT 6 INPUT 7 INPUT 8 HIGH SPEED INPUTS IRIG B Tx Rx Tx Rx SIGNAL NAME PORT 1 Wiring RS485 SHIELD Tx Rx COLOR CABLE SIGNAL Cable 4 RS485 SHIELD Tx Rx Blue Tx Rx...

Страница 81: ...ould provide more than one year of service during outage conditions time on battery backup A LOW BATTERY indicator on the display screen will tell you when replacement is needed Installation steps 1 If you are replacing a battery download all memory files to your computer Data may be lost 2 Remove power from the meter 3 Remove the external meter cover and the internal shroud 4 Remove the old batte...

Страница 82: ...ttery against the INSIDE RIGHT WALL of the battery holder Arrow A STEP B Gently push the LEFT SIDE of the battery in until it snaps into place Arrow B 6 2 2 Battery Safety and Disposal Do not expose battery to temperatures above 100 degrees C Do not incinerate puncture crush recharge short circuit or over discharge battery Do not expose contents of battery to water or to high humidity for extended...

Страница 83: ... feet of RS485 communication power cable harness is supplied Allow for at least a 1 25 inch 3 17cm diameter hole in the mounting panel for the cable harness Q The display is powered by an external power source such as the PSIO which supplies 12 VDC Each display requires 3 VA typical The P40N can draw up to 500 mA in display test mode See Figure 5 9 for wiring detail wiring is the same as for the P...

Страница 84: ...he PSIO See Figure 5 10 for wiring NOTE The P60N WILL NOT display TOU Data Q For optimum performance maintain the following conditions where the Touch Screen Display is mounted Operating Temperature 0 to 50 C 32 to 122 F Storage Temperature 20 to 70 C 36 to 158 F Relative Humidity 25 to 65 non condensing NOTE One of the display mounting studs MUST be grounded automatic if mounted in a metal ground...

Страница 85: ...P60N Display using the steps below 1 Connect up to 8 meters to one P60N as shown in Figure 6 11 below 2 Using the P60N face touch the SETTINGS Button NEXT LINK SETTINGS 3 Touch UP on the LINK SETTINGS screen to add an Address Each slave device in the chain MUST be assigned a UNIQUE ADDRESS A SAVE Button will appear 4 Touch the SAVE Button to Save the New Address 5 Select the Address for the meter ...

Страница 86: ...the screws supplied 440 pan head screws Next secure the brackets to a flat surface using a 8 screw with a lock washer Q The Nexus 1262 1272 meter will NOT supply power for the Output modules You must use an external power supply such as the EIG PSIO 12V Output Figure 6 12 shows the modules mounted without a PSIO Power Supply Figure 6 15 shows mounting with the PSIO Figure 6 12 Nexus Output Modules...

Страница 87: ...m Y 1 31 31 37mm 1 25 31 75mm Y Per Module 3 44 87 38mm 2 20 55 87mm Nexus Output Modules Mounting Diagram Front View Nexus Output Modules with PSIO Mounting Diagram Front View Y 1 31 31 37mm X 1 73 43 94mm 0 6 15 24mm 3 44 87 38mm 2x1 10 27 93mm 2 20 55 87mm Mounting Bracket MBIO Mounting Bracket MBIO 1 25 31 75mm Y Per Module X Per PSIO ...

Страница 88: ... wiring is the same for all the units The only difference between the Output modules and the displays is that the port is on the side of the Output module see Figure 6 13 while the displays have the port on the back See Chapter 5 for communication details See Figure 5 11 for wiring details Nexus Output Modules Wiring Diagram Auxiliary Power PSIO is supplied through pins 4 5 Connection through SHIE...

Страница 89: ...day Weekend Holiday 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 meter stores accumulations on a seasonal basis up to four season...

Страница 90: ...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 cannot be reset See the Communicator EXT User Manual for instructions on resetting current TOU accumulations Q At the end of...

Страница 91: ...rmer This condition is shown pictorially in Figure 8 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 The need for loss compensated metering may also exist when the ownership ...

Страница 92: ...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 meter us...

Страница 93: ...ors derived by clicking the TLC Calculator button on the Transformer Loss screen of the Device Profile or by manually figuring values in section 8 2 1 Calculating Transformer Loss Compensation Percentages Work Sheet Enter the derived values in the Device Profile screen of the Communicator EXT software values will automatically be entered from the TLC Calculator button Q The Communicator EXT softwa...

Страница 94: ...ges 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 Current...

Страница 95: ...elf 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 Serial...

Страница 96: ...ransformer 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 _______________ kVA...

Страница 97: ... 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 Base k...

Страница 98: ... 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 the Nexus meter using Communicator EXT 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 ...

Страница 99: ...te at 9600 baud To use the Displays on another port configure that port to operate at 9600 baud using the Communicator EXT Software see the Communicator EXT User Manual 9 2 Nexus P40N LED External Display Q The Nexus P40N LED External Display has three modes Dynamic Readings Mode sections 9 3 and 9 4 Nexus Information Mode sections 9 5 and 9 6 Display Features Mode sections 9 7 and 9 8 Q Each Mode...

Страница 100: ...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 Measured...

Страница 101: ...rimary 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 ...

Страница 102: ... IC Minimum IA IB IC THD IA IB 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...

Страница 103: ...T Ratios 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 Communicator EXT User Manual When Primary is selected the Display shows all readings in Primary units based on the user programmed PT and CT Rat...

Страница 104: ...Readings Return To First Reading Return To First Reading 9 6 Navigational Map of Information Mode Q Use UP DOWN arrows to scroll between groups Q Use LEFT RIGHT arrows to scroll between readings Electro Industries GaugeTech Doc E151701 9 6 Return To First Reading Comm Settings Port 4 Comm Settings Port 3 Comm Settings Port 2 Comm Settings Port 1 ...

Страница 105: ...f 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...

Страница 106: ...tion Protocol Baud Rate Address EIG Use Only EIG Use Only Display Scroll On Off G r o u p s 9 8 Navigational Map of Display Features Mode Q Use UP DOWN arrows to scroll between groups Electro Industries GaugeTech Doc E151701 9 8 Lamp Test ...

Страница 107: ...tton The P60N has a VA Rating of 5 and is powered by an external power source such as the PSIO See Figures 6 9 and 6 11 for wiring detail Q 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 sect...

Страница 108: ...ltage 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 Current Detail Electro Industries G...

Страница 109: ...ils Thermal Window Average 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 Wa...

Страница 110: ... Fixed Window kWatth kVARh kWatth kVARh Coin kVARh Coin kVARh Touch ACCUM to view TOU Accumulations Touch Next Reg to scrol 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 Touch SHORT TERM or LONG TERM to view other Flicker scr...

Страница 111: ...ttings 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 right of screen Phase Phase Angle Van bn cn Phase Angle Ia b c Phase Angle Vab bc ca Q WAVEFORM Real Time Waveform Graph Channel Va b c Cha...

Страница 112: ...of Logs 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 increse the Interval t...

Страница 113: ... Counters All Logs TOU for Current Season 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 A setting of 0 keeps the Back Light ON Touch Up Down buttons to increase decrease settings Q NEXUS LINK SETTINGS Nexus Address 000 255 Touch Up Down but...

Страница 114: ... 1262 meter 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 1262 meter Boot Run time DSP Boot DSP Run time LCD Display This screen displays the current firmware version for the Nexus meter and the display Electro Industries GaugeTech Doc E151701 9 1...

Страница 115: ...9 10 Navigational Map for P60N Touch Screen External Display Electro Industries GaugeTech Doc E151701 9 17 ...

Страница 116: ...mum Input Voltage 30V DC Minimum Input Voltage 7V DC VA Rating 3 0 VA typical Nominal Power Consumption Approximately 3 Watts Operating Temperature Range 20o C to 60o C 4o F to 140o F Overall Dimensions HxWxL 2 2 x 4 4 x 4 4 in 5 9 x 11 1 x 11 1 cm P60N Touch Screen Display Specification Maximum Input Voltage Minimum Input Voltage VA Rating Nominal Power Consumption Operating Temperature Range Ove...

Страница 117: ...wiring detail Output 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 surface Output...

Страница 118: ...Industries Output Modules have ports through which they interface with other devices The port configurations are variations of the three types shown below Four Analog Outputs Eight Analog Outputs Four Relay Outputs 0 1 1mA and 4 2 20mA 0 1 1mA and 4 2 20mA or Four KYZ Pulse Outputs ...

Страница 119: ...munication pins of the module s Male RS485 Side Port Follow steps below and see Figure 10 2 below See Section 10 3 for details on using multiple Output modules Figure 10 2 Nexus Meter Connected to Output Module RT RT For runs typically longer than 500 feet Male Side Port on Nexus Output Module Nexus 1262 1272 Meter s Port 4 LED s Q NOTE Termination Resistors are only needed with runs typically mor...

Страница 120: ...e RS485 port Connect the shield to the shield S terminal The S terminal on the meter is used to reference the meter s port to the same potential as the source It is not an earth ground connection You may 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 3 Connect a power source to the front of the module Refer...

Страница 121: ...le in a group must be assigned a unique address See the Communicator EXT User Manual for details on configuring and programming the Output Modules 2 Determine how many power sources such as PSIO are needed for the number of modules in use See Section 5 3 11 for details Figure 10 6 Multiple Output Modules Output Modules must use the Nexus 1262 1272 Meter s Port 4 Set the port to 57600 Baud Output M...

Страница 122: ... group together as a unit 6 Attach the right Mounting Bracket to the right side of the group using the small phillips head screws provided 7 Then mount the group of modules on a secure flat surface This procedure will ensure that all modules stay securely connected 10 4 Factory Settings and Reset Button Q Factory Settings All Nexus Output modules are shipped with a preset address and a baud rate o...

Страница 123: ...les Specifications Accuracy Communication Power Requirement Operating Temperature Maximum Load Impedance RS485 Modbus RTU 15 20Vdc at 50 200mA Nexus 1262 1272 Unit s Power Supply DOES NOT Support Output 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 Channel Analog Output 4 20mA 20mAON8 8 Chann...

Страница 124: ... 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 T...

Страница 125: ... Baud Rate 57600 10 6 1 Overview Q The Relay Output 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 The Nexus 1262 1272 unit does not supply power for the Relay Output modu...

Страница 126: ...perate 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 10 4 1 for details of Default Mode 10 6 3 Normal Mode Q Normal Mode consists of one process 1 The device accepts new commands to control the relays ...

Страница 127: ...YZ Pulse Output Modules have 4 KYZ Pulse Outputs 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 Output Modules User Manual for details on programming the module Q The Nexus 1262 1272 unit does not supply power for the KYZ Pulse ...

Страница 128: ...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 the...

Страница 129: ...he meter 1mAON4 4 Analog Outputs scalable bidirectional 1mAON8 8 Analog Outputs scalable bidirectional 20mAON4 4 Analog Outputs scalable 20mAON8 8 Analog Outputs scalable Q Digital Dry Contact Relay Outputs Multiple modules can be used 4RO1 4 Relay Outputs 10 Amps 125Vac 30Vdc Form C Q Digital Solid State Pulse Outputs Multiple modules can be used 4PO1 4 Solid State Pulse Outputs Form A KYZ pulses...

Страница 130: ...Electro Industries GaugeTech Doc E151701 10 14 ...

Страница 131: ...Ts 2 CTs 9S Wye no PTs 3 CTs Nexus MeterFormsandAssociatedApplicationDiagrams 3 Wire Delta 2 PTs 2 CTs 2 5 EL Wye no PTs 3 CTs Chapter 11 Electrical Installation for Nexus 1262 1272 Meter Table 11 1 Nexus 1262 1272 Meter Forms 36S Wye no PTs 3 CTs 2 5 EL Wye 2 PTs 3 CTs 4 Wire Delta 3 PTs 3 CTs 4 Wire Delta no PTs 3 CTs 4 Wire Delta no PTs 2 CTs 4 Wire Delta 2 PTs 2 CTs Wye 2 PTs 3 CTs 45S 3 Wire ...

Страница 132: ...ter per NEC 1999 Section 250 24 5 and 250 26 AUXILIARY POWER Meters may be externally powered using a 120 to 230 V AC or 125 to 400 V DC power supply NOTE For forms not on the above list contact the factory and let us know your requirements Electro Industries GaugeTech Doc E151701 11 2 ...

Страница 133: ...Electro Industries GaugeTech Doc E151701 11 3 Fig 11 1 Form 9S Wye no PTs 3 CTs ...

Страница 134: ...Fig 11 2 Form 9S Wye 3 PTs 3 CTs Electro Industries GaugeTech Doc E151701 11 4 ...

Страница 135: ...Electro Industries GaugeTech Doc E151701 11 5 Fig 11 3 Form 9S 4 Wire Delta no PTs 3 CTs ...

Страница 136: ...Fig 11 4 Form 9S 4 Wire Delta 3 PTs 3 CTs Electro Industries GaugeTech Doc E151701 11 6 ...

Страница 137: ...Fig 11 5 Form 9S 4 Wire Delta no PTs 2 CTs Neutral is not shown for simplicity Electro Industries GaugeTech Doc E1151701 11 7 ...

Страница 138: ...Fig 11 6 Form 9S 4 Wire Delta 2 PTs 2 CTs Neutral is not shown for simplicity Electro Industries GaugeTech Doc E151701 11 8 ...

Страница 139: ...Fig 11 7 Form 9S 3 Wire Delta no PTs 2 CTs Electro Industries GaugeTech Doc E151701 11 9 ...

Страница 140: ...Fig 11 8 Form 9S 3 Wire Delta 2 PTs 2 CTs Electro Industries GaugeTech Doc E151701 11 10 ...

Страница 141: ...Fig 11 9 Form 36S 2 5 Element Wye no PTs 3 CTs Electro Industries GaugeTech Doc E151701 11 11 ...

Страница 142: ...Fig 11 10 Form 36S 2 5 Element Wye 2 PTs 3 CTs Electro Industries GaugeTech Doc E151701 11 12 ...

Страница 143: ...Fig 11 11 Form 45S Wye no PTs 3 CTs Electro Industries GaugeTech Doc E151701 11 13 ...

Страница 144: ...Fig 11 12 Form 45S Wye 2 PTs 3 CTs Electro Industries GaugeTech Doc E151701 11 14 ...

Страница 145: ...Fig 11 13 Form 45S 3 Wire Delta no PTs 2 CTs Electro Industries GaugeTech Doc E151701 11 15 ...

Страница 146: ...Fig 11 14 Form 45S 3 Wire Delta 2 PTs 2 CTs Electro Industries GaugeTech Doc E151701 11 16 ...

Страница 147: ...Fig 11 15 Form 45S 4 Wire Delta no PTs 2 CTs Neutral is not shown for simplicity Electro Industries GaugeTech Doc E151701 11 17 ...

Страница 148: ...Fig 11 16 Form 45S 4 Wire Delta 2 PTs 2 CTs Neutral is not shown for simplicity Electro Industries GaugeTech Doc E151701 11 18 ...

Страница 149: ...elow The socket meter is pushed into the S A Adapter until the meter snaps into place The blades on the back of the socket meter make the proper connection See section 11 1 for the 9S Form wiring diagrams Fig 11 17 Form 9S Mounted in an S A Adapter Front Terminal Cover Removed Electro Industries GaugeTech Doc E151701 11 19 ...

Страница 150: ...Electro Industries GaugeTech Doc E151701 11 20 ...

Страница 151: ...s Switchboard Meter works just like the Nexus 1262 1272 Socket Meter For a complete summary of all the features see Chapter 2 of this manual For details on any of the many features see the Table of Contents for the desired feature Q The differences are few The labels on the face and the shroud of the meter will be slightly different depending on options selected see Section 12 2 for label detail t...

Страница 152: ...262 1272 Socket Meter Forms are 9Z and 36Z and there may be some additional items depending on options selected See Chapter 3 of this manual for a description of the components on the front and shroud labels Fig 12 2 Front view of the 1272 Switchboard Meter Fig 12 3 Example Options Label for the 1262 or 1272 Switchboard Meter ...

Страница 153: ...s are detailed below The specifications are detailed in Chapter 2 of this manual Q The Nexus Switchboard Meter is essentially the socket meter in an optional oblong case The dimensions are detailed in Figures 12 1 Front View 12 4 Back View and 12 5 Side View Caution Power In on new units is configured differently Please check wiring carefully Fig 12 4 Switchboard Meter Back View Electro Industries...

Страница 154: ...Electro Industries GaugeTech Doc E151701 12 4 Fig 12 5 Switchboard Meter Side View ...

Страница 155: ... Diagram Fig 12 6 The dimensions shown are the exact measurements of boxes we have on hand that have been measured We added 1 16 1 5875mm for the cutout Please check DRILL HOLES for the mounting screw you are using Check to see that the mounting screw fits the box tightly enough to hold the box in place You can use a washer for a slightly smaller mounting screw Fig 12 6 Switchboard Meter Cutout wi...

Страница 156: ...e and secure by sliding the chassis levers until they snap into place Connectors for the following are located on the back of the meter The connectors will automatically plug into the available connectors on the mounting board see figure below Pulse Outputs Four Channels Status Inputs Phone Line Network Power In COM4 COM1 IRIG B Modem Gateway RS485 Position the case front against the four screw ho...

Страница 157: ...ce department All wiring should be done by a licensed professional Actual installation procedures materials equipment and connections must conform to applicable codes and standards Fig 12 8 Back Angle View of Switchboard Meter Form Description 9Z Wye no PTs 3 CTs Wye 3 PTs 3 CTs Table 12 1 Switchboard Meter Configurations 4 Wire Delta no PTs 3 CTs 1262 1272 Switchboard Meter Forms and Associated A...

Страница 158: ...Electro Industries GaugeTech Doc E151701 12 8 Fig 12 9 9Z Transformer Rated Wye no PTs 3 CTs Caution Power Supply Input on new units is configured differently Please check wiring carefully ...

Страница 159: ...Electro Industries GaugeTech Doc E151701 12 9 Fig 12 10 9Z Transformer Rated Wye 3 PTs 3 CTs Caution Power Supply Input on new units is configured differently Please check wiring carefully ...

Страница 160: ...Electro Industries GaugeTech Doc E151701 12 10 Fig 12 11 9Z Transformer Rated 4 Wire Delta no PTs 3 CTs Caution Power Supply Input on new units is configured differently Please check wiring carefully ...

Страница 161: ...Electro Industries GaugeTech Doc E151701 12 11 Fig 12 12 9Z Transformer Rated 4 Wire Delta 3 PTs 3 CTs Caution Power Supply Input on new units is configured differently Please check wiring carefully ...

Страница 162: ...Electro Industries GaugeTech Doc E151701 12 12 Fig 12 13 9Z Transformer Rated 4 Wire Delta no PTs 2 CTs Caution Power Supply Input on new units is configured differently Please check wiring carefully ...

Страница 163: ...Electro Industries GaugeTech Doc E151701 12 13 Fig 12 14 9Z Transformer Rated 4 Wire Delta 2 PTs 2 CTs Caution Power Supply Input on new units is configured differently Please check wiring carefully ...

Страница 164: ...Electro Industries GaugeTech Doc E151701 12 14 Fig 12 15 9Z Transformer Rated 3 Wire Delta no PTs 2 CTs Caution Power Supply Input on new units is configured differently Please check wiring carefully ...

Страница 165: ...Electro Industries GaugeTech Doc E151701 12 15 Fig 12 16 9Z Transformer Rated 3 Wire Delta 2 PTs 2 CTs Caution Power Supply Input on new units is configured differently Please check wiring carefully ...

Страница 166: ...Electro Industries GaugeTech Doc E151701 12 16 Fig 12 17 36Z 2 5 Element Wye no PTs 3 CTs Caution Power Supply Input on new units is configured differently Please check wiring carefully ...

Страница 167: ...Electro Industries GaugeTech Doc E151701 12 17 Fig 12 18 36Z 2 5 Element Wye 2 PTs 3 CTs Caution Power Supply Input on new units is configured differently Please check wiring carefully ...

Страница 168: ...Electro Industries GaugeTech Doc E151701 12 18 ...

Страница 169: ...r Wye and Delta services Samples for 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 2 1 X n ...

Страница 170: ...tts per phase 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 Q per phase For Wye X A B C For Delta unused X XN RMS X RMS VA V I 1 n xn t x t t x v i n W 2 1 XY n xy t t RMS v n V 2 2 X X X VAR VA W 3 2 X X X VAR W Q ...

Страница 171: ...ctive Power VAR Total For Wye For Delta Q Apparent Power VA Total For Wye For Delta T A B C W W W W 1 n ab t a t bc t c t t T v i v i n W T A B C VAR VAR VAR VAR 2 2 1 A AB n ab t a t t RMS T RMS v i n VAR V I 2 2 1 C BC n bc t c t t RMS RMS v n i V I 2 2 T T T VA W VAR T A B C VA VA VA VA ...

Страница 172: ...ye For Delta Q Total Energy X WT VART VAT QT Q Power Factor PF For Wye X A B C T For Delta X T Q Total Average Power Factor X Quadrants 1 4 positive Wh Quadrants 2 3 negative Wh X X X W PF VA _ X X Total Ave X Wh PF VAh 3600 X Xh T A B C Q Q Q Q 2 3 T T T W VAR Q ...

Страница 173: ... X VAN VBN VCN IA IB IC For Delta X IA IB IC VAB VBC VCA Q K Factor X IA IB IC Q Voltage Imbalance Q Current Imbalance 127 2 1 127 2 1 h h X h X X h h RMS KFactor RMS i 1 127 2 2 h X h X X RMS THD RMS 2 V Imb AN BN CN an bn cn V V V n n v v v RMS RMS RMS I Imb CalcN A B C I I I I RMS RMS RMS RMS 1 cos X X PF ...

Страница 174: ...verage arithmetic mean of power readings over a programmed interval Example A typical setting of 15 minutes produces an average value every 15 minutes at 12 00 12 15 12 30 etc for power readings 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 overlapping Block Window Demands The programm...

Страница 175: ...val 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 prediction for the remainder of t...

Страница 176: ...Electro Industries GaugeTech Doc E151701 13 8 ...

Страница 177: ...ce 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 demodulated output The configuration consists of a 05 Hz ...

Страница 178: ...ould 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 sev...

Страница 179: ...m the Device Profile select Power Quality and Alarm Settings EN50160 Flicker The following screen will appear Electro Industries GaugeTech Doc E151701 14 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 ...

Страница 180: ... implementation 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 14 4 Software User Interface Q Main screen From the Communicat...

Страница 181: ...age 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 ...

Страница 182: ... since 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 Curren...

Страница 183: ... through the Communications Port Refer to the Nexus meter Modbus and DNP Mappings for register assignments and data definitions 14 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 Us...

Страница 184: ...id 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 ...

Страница 185: ...needed for the Transformer Loss screen of the Device Profile 2 Enter the values into the Device Profile Use the worksheet found in Chapter 8 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 worksheet is progressive and notes under each section will guide you to th...

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Страница 191: ...62 1272 Socket Meters are listed below 9S Wye no PTs or 3 PTs 3CTs 3 Wire Delta no PTs or 2 PTs 2 CTs 2 5EL Wye no PTs or 2 PTs 3 CTs 4 Wire Delta no PTs or 2 PTs 2 CTs 4 Wire Delta no PTs or 3 PTs 3 CTs 36S 2 5EL Wye no PTs or 2 PTs 3 CTs 45S Wye no PTs or 2 PTs 3 CTs 3 Wire Delta no PTs or 2 PTs 2 CTs 4 Wire Delta no PTs or 2 PTs 2 CTs B 2 Blade Configuration Drawings Q Detail drawings of the Bl...

Страница 192: ...ro Industries GaugeTech Doc E151701 B 2 Fig B 1 Form 9S 36S Base with Knock Out Holes Fig B 2 Form 45S Base with Knock Out Holes Note The forms referred to on this page comply with ANSI forms 9S 36S and 45S ...

Страница 193: ...former 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 C 1 1 Wye Connection Q The wye connection is so called because ...

Страница 194: ...tions 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 ground...

Страница 195: ...round 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 delta service the phase to ground voltage would be 120 volts on two...

Страница 196: ...analog 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 t...

Страница 197: ... 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 C 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 of currents into Node n must equal ze...

Страница 198: ...tantaneous 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 1 4 of that total or one kWh Q Figure C 7 shows a grap...

Страница 199: ...ement 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...

Страница 200: ... 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 power and powe...

Страница 201: ...uirements 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 following formula Total PF r...

Страница 202: ...ar 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 C 10 shows a normal sinusoidal current waveform This example has no distortion Figure C 10 Nondistorted Current Waveform Q Fig...

Страница 203: ... 11 Figure C 12 Waveforms of the Harmonics The waveforms shown in Figure C 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 GaugeT...

Страница 204: ...ers 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 ...

Страница 205: ...ansported 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 E151701 C 13 Cause Dist...

Страница 206: ...Electro Industries GaugeTech Doc E151701 C 14 ...

Страница 207: ...ulse 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 minutes So...

Страница 208: ...e the value of the current from a secondary value up to the primary side of an instrument tranformer Cumulative Demand The sum of the previous billing period maximum demand readings at the time of billing period reset The maximum demand for the most recent billing period is added to the previously accumulated total of the maximum demands Demand The average value of power or a similar quantity over...

Страница 209: ...ulate until current reaches programmed level Infrared Test Pulse Energy indicator located on the upper left side of the face of the Nexus 1260 1262 1270 1272 meters pulses are generated per the programmed Ke value Integer Any of the natural numbers the negatives of those numbers or zero Internal Modem An optional modem within the meter s enclosure that connects to the RJ 11 telephone connector Inv...

Страница 210: ...VRAM Nonvolatile Random Access Memory is able to keep the stored values in memory even during the loss of circuit or control power High speed NVRAM is used in the Nexus meter to gather measured information and to insure that no information is lost Optical Port A port that facilitates infrared communication with a 1260 1262 or 1270 1272 meter Using an ANSI C12 13 Type II magnetic optical communicat...

Страница 211: ...specified time For example the average is calculated over a 15 minute interval by calculating the sum of the average of three consecutive 5 minute intervals This demand calculation methodology has been adopted by several utilities to prevent customer manipulation of kW demand by simply spreading peak demand across two intervals RS232 A type of serial network connection that connects two devices to...

Страница 212: ...hen voltage falls below programmed level Voltage Imbalance The ratio of the voltage on a phase to the average voltage on all phases Voltage Quality Event An instance of abnormal voltage on a phase The events the meter will track include sags swells interruptions and imbalances VT Ratio The Voltage Transformer Ratio is used to scale the value of the voltage to the primary side of an instrument tran...

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