EZ Meter A4231/3 User Manual

Dual 3-wire, single phase meter

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METER

Watthour Meters

Product Selection Guide

User Manual

Installation Manual

Dual 3-Wire, Single Phase Meter (Model A4231/3)

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Page 1 METER Watthour Meters Product Selection Guide User Manual Installation Manual Dual 3-Wire, Single Phase Meter (Model A4231/3)
Page 2: Legends
CAUTIONS Legends Serious injury can result from electric shock. These symbols appear on meter labels. Be sure to turn off the power before installing or servicing any meter. Caution, risk of Danger Fire can result from loose electrical Equipment protected throughout by double connections.
Page 3: Table Of Contents
Contents CAUTIONS..............Legends.
Page 4 Trouble Shooting............Page 26 Installing a Grid Connect NET485 (Ethernet-RS422/485 Adapter).
Page 5: Safety Certification
A Note for California Users Safety Certification All meters used in California for which a charge is made for power must have been Underwriter’s Laboratories (UL) inspected by a Weights & Measures Most EZMeters have been tested by UL inspector and placed in service by a to UL916 and carry the UL Recognized Licensed Service Agent or a Weights &...
Page 6: Limited Warranty
Limited Warranty EZMeter Technologies warrants its products, if used in accordance with all applicable instructions, to be free from original defects in material and workmanship for a period of five years from the date of manufacture. If the product should prove defective in material or workmanship within that period, EZMeter Technologies will repair or replace the product, in its sole discretion.
Page 7: Product Selection Guide
Product Selection Guide This chapter provides information to help you choose the best meter for your requirements. Automatic Meter Reading (AMR). Every EZMeter is available with one of four Automatic Meter Reading (AMR) capabilities: None, Pulse, EZ Plus, or ModBus. No AMR requires someone to visit each meter periodically and manually write down the reading from the display.
Page 8: Bi-Directional Meters
Modbus is an old protocol and the de facto standard for building and industrial automation. The register map is available on page 39. Several third party software vendors offer software already configured to the EZMeter register map. Meters can be ordered for either big (default) or little endian and either signed (default) or unsigned integers.
Page 9: Maximum Current And Current Transformers
E. Three element only: 240-300 volts to neutral on two legs, 430-500 volts to neutral on the third leg, 430-500 volts line to line, four wire, three phase delta. F. Dual Element only: 200-260 volts line to line, three wire, three phase delta G.
Page 10: Enclosures
Enclosures. A variety of enclosures that hold different numbers of meters are available. Most are NEMA4X rated plastic enclosures with the meters mounted on a plastic panel inside. Use of plastic enclosures allows AMR radios to be mounted inside. Interior rated enclosures have a clear cover while exterior rated ones have a solid cover.
Page 11 Fourth Character - Maximum rated current (Meter Class) 0 = 60 amps 1 = 100 amps 2 = 150 amps 3 = 200 amps 4 = 250 amps 5 = 400 amps 6 = 800 amps 7 = 1200 amps 8 = 1600 amps 9 = 2000 amps Fifth Character - Automatic Meter Reading (AMR)
Page 12 Eighth Character - Resolution 0 = Display: 1.0 kwh Isolated: 1.0 kwh 1 = Display: 0.1 kwh Isolated: 0.1 kwh 2 = Display: 0.01 kwh Isolated: 0.01 kwh 3 = Display: 0.01 kwh Isolated: 1.0 kwh Ninth Character - Parity and Bidirectional 0 = No parity, standard meter 1 = No parity, bidirectional meter 2 = Even parity, standard meter...
Page 13: Part Number Suffixes For Ordering
Part Number Suffixes for Ordering. The part numbers above are printed on the meter cases and enclosures. For ordering and invoicing, a part number suffix consisting of a hyphen (-) and two digits may be appended to the part number. The first digit is the number of CTs that go with the meter.
Page 14: Ezmeter Current Transformers
EZMeter Current Transformers. Each meter is manufactured to work with one model of current transformer (CT). While it is true that a CT with the same turns ratio can be substituted for another without causing a significant error, for best accuracy, use the CT specified on the meter label. The meter has been calibrated to account for variations in how the CT responds to different phase angles, a function of the core material rather than the turns ratio.
Page 15: Operating Instructions
Operating Instructions After installation, the EZ Meter is simple to operate. You read the meter the same way you read the odometer in a car. The label on the front of the meter indicates the resolution of the display, either full kilowatt hours (kwh), tenths of kwh or hundredths of kwh The label on the outside of the enclosure also states the resolution.
Page 16: Understanding The Meter Electronics Module Label
If the meter appears to operate erratically, it is probably because it measures each phase separately and flashes the red LED when each phase accumulates 1/100 kwh (or other resolution). The resolution may be different for the red LED, the display and the isolated output. Check the meter label where the resolution of each will be noted.
Page 17 CT Ratio: The turns ratio of the current transformer that is intended for use with this meter. Vertically printed next to the labeling of the CT terminals is the model number of the current transformer the meter was calibrated against. Each model of CT has a slightly different phase angle adjustment which is programmed into the meter during calibration.
Page 18: Installation Instructions
These instructions are for meters whose model number begins with a letter, not a number. The EZ Meter consists of an electronics module, one or more current transformers (CTs), a display of one or two electro-mechanical or LCD display counters, and an enclosure that holds from one to 12 meters.
Page 19 CTs Are Directional (or Not) If the meter is otherwise installed correctly, it will accurately record all the power that flows through the CTs. If you are working with three phase power, even if only one or two legs of it, you should be sure the arrows or labels are facing in the right direction.
Page 20: Electrical Connections
WARNING Hazardous voltages exist in CT wires when they are not connected to a meter and current is flowing through wire passing through the CT. Wire nut the CT wires together if you must remove the meter and leave the CTs in place. Failure to do so may damage the CT or shock someone.
Page 21: Isolated Outputs
diagrams. If you have a three element, dual output meter, DISP1 is matched with CT #1 and L1 while DISP2 is matched to L2, L3 and the remaining CT(s). If you have a four element, dual output meter, the power flowing through the CTs marked ‘A’ is displayed on DISPA while the CTs marked ‘B’...
Page 22: I2C Port Connection
For the RS-485 model, connect the orange and brown wires to the A (RX-) terminal, the yellow and green wires to the B (TX+) terminal, the black wire to the IGND terminal and the red wire to IPWR (Be sure to check that there is at least 4.8 VDC between IGND and IPWR if there are multiple meters installed).
Page 23: Wiring Diagrams
Notes on Wiring Diagrams on following pages: The voltages shown on most of the diagrams are for the allowable voltage range for meters made for 110-120 volt electric systems found in the USA. The voltage shown is for line-to-neutral or line-to- line for meters that do not use a neutral.
Page 24 Page 22...
Page 25 Page 23...
Page 26 10. RS-485 Network Layout Page 24...
Page 27: Testing The Installed Meter
WATTS is the wattage shown on the Testing the Installed Meter nameplate of the appliance providing the load. After the meter has been installed, it is For example, a 1500 watt heat gun on 120 a good idea to turn power on the system and volts will use 0.01 kwh in 4,320,000 / 120 / check to see that the meter was connected to 1500 or 24 seconds.
Page 28: Trouble Shooting
the meter, at the panel, or where it connects to Trouble Shooting ground. Check your neutral. If a CT wire is shorted to neutral or ground, it will also cause Try the following steps if the meter does not a very high reading. work.
Page 29: Installing A Grid Connect Net485 (Ethernet-Rs422/485 Adapter)
EZMeter Technologies Application Note Installing a Grid Connect NET485 (Ethernet-RS422/485 Adapter) Several companies make Ethernet to RS485 adapters that are suitable for connecting EZ Meters to the internet or a local area network (LAN). Most come with a fixed IP address and setting one up is both time consuming and difficult.
Page 30 Step 5. Set up the connection data. Click ‘Connection’ on the menu on the left side of the screen. Under Connect Mode: Protocol = ‘Yes’, Accept Incoming = ‘Yes’, Password Required = ‘No’, Active Connect = ‘No’ Under Endpoint Configuration. Local Port is one of the values you will enter into the EZMeterReader software package to connect to this device.
Page 31: Connecting Digi Radio Modems To Ezmeters
EZMeter Technologies Application Note Connecting Digi Radio Modems to EZMeters The MaxStream division of Digi Corporation makes several radio modems that work as wireless RS-485 network extenders. The three series, XCite, XStream and XTend all have the same function with XCite having the shortest, and Xtend being the most powerful. Maximum range for the different models (from the Digi specifications) are: Model Indoor/Urban Range...
Page 32 Connecting a Radio to the Meters. Before connecting a radio to the meter network, it is a good idea to connect a portable computer to the network to determine that everything is working properly. It is easier to troubleshoot if you know the problem is in the wiring rather than with the radios.
Page 33: Connecting Snap Link Radios To Ezmeters
EZMeter Technologies Application Note Connecting Snap Link Radios to EZMeters Snap Link radios produced by Synapse are another cable replacement option for creating an RS485 network. Product information is available on their website at: http://www.synapse-wireless.com/iot-development/hardware-products/snaplink One downside to using Snap Link is that a separate USB to RS485 adapter is required. The USB port built into each radio is only for providing power, not communications.
Page 34 EZMeter Technologies Application Note RS-485 Trouble Shooting Ideally, you will hook up your system and it will work the first time. If that doesn’t happen, you have a few options. 1. Use the EZMeter Access program to communicate with the meters through the EZServer meter reading and logging utility that is part of the EZMeter Power Suite.
Page 35 b. Be sure you have added the meter you are trying to communicate with to the system and that the serial number (EZ Plus) or Modbus address (Modbus) is entered in the appropriate space without any hyphens or commas. c. If you have set up more than one connection for your system, make sure that the meter under test is part of the meters served by the active connection.
Page 36 address may have been for another meter or the message received may have been corrupted. Corrupted messages are usually caused by improper termination. Problem: Both lights in Dongle flash, but there is no reply. 1. Watch the white, bicolor LED. If it flashes red it is not replying. If the meter replies, the LED will flash red then green so fast that it looks sort of orange.
Page 37 Using an Ethernet to RS485 Adapter (such as the NET485) Problem: No response from meter 1. Verify IP address is correct. Suggest setting a fixed IP rather than relying on DHCP. Log into the web server in the adapter. This will verify the IP address. While there: 2.
Page 38: Phantom Neutral Installation Guide
EZMeter Technologies Application Note Phantom Neutral Installation Guide Usage: The EZMeter Technologies Phantom Neutral devices may be used in conjunction with a standard three phase wye EZMeter to allow connection to a three-wire, three-phase delta electrical service. It should be used whenever a neutral is not available. Models: For a 440 to 480 volt, line to line, three wire delta, use a model PN277 in conjunction with an EZMeters with a model number that begins with the letter D (or E if you already have one).
Page 39: Obvius Acquisuite Connections
EZMeter Technologies Application Note Obvius AcquiSuite Connections The Obvius AcquiSuite can be used with the EZMeter Modbus meters. While not listed on the Obvius website as a supported meter, it can be used in conjunction with the EMZMeter.mbt format file (www.ezmeter.us/downloads/EZMeter.mbt). To connect an EZMeter to an AcquiSuite, you need to provide isolated DC power to IPWR and IGND;...
Page 40: Next Century Radio Module
EZMeter Technologies Application Note Next Century Radio Module Next Century offers a special version of their pulse counting radios that get power from an EZMeter rather than using a battery that must be replaced on regular intervals. The fifth character of the EZMeter model number should be a 7 which indicates a special module has been installed in the meter to provide the regulated 3.3 volts needed to power the radio.
Page 41: Modbus Interface Description
EZMeter Technologies Application Note Modbus Interface Description The data space for the meter consists of two blocks of registers that may be selectively accessed using the standard Modbus Functions listed below. Paragraph references are to the document “MODBUS APPLICATION PROTOCOL SPECIFICATION V1.1b”. 6.3 03 (0x03) Read Holding Registers 6.4 04 (0x04) Read Input Registers 6.6 06 (0x06) Write Single Register...
Page 42 Write Single Register Function 06 This command may be used to write single register values only. It may not be used to write individual registers in a defined array of registers except that individual pairs of bytes of the Customer Identification Array may be written with this command as long as the correct priority level has been established by the previous entry of the appropriate password.
Page 43: Modbus Registers & Summed Accumulator Registers
Offset Reg Address Size Default Value Regs Description Units Used Used Metered Values Acc. Pwr. Ph. 1 10Wh (Imp - Pos) 10 watt hr. Acc. Pwr. Ph. 2 10Wh (Imp - Pos) 10 watt hr. Acc. Pwr. Ph. 3 10Wh (Imp - Pos) 10 watt hr.
Page 44 The configuration of the Modbus registers is listed in Table 1, above. Details of individual registers are as follows: The first 12 pairs of registers register the power flowing through the monitored circuits. Each set of registers contains 4 bytes, counting power in units of 10 watt hours. The counters are arranged so that they reset to zero when the maximum count of the binary equivalent of 99,999,999 decimal (corresponding to 999,999.99 KWHrs) is exceeded.
Page 45 The next four blocks of six registers contain blocks of data that represent the average readings of voltage, current, power, frequency and power factor for the preceding block of 64 ac line cycles on each input. The registers are thus updated every 1.07 seconds. The first 6 registers report Channel 1.
Page 46 The next three blocks of registers follow the same pattern. Phase 2 Voltage Phase 2 Current Phase 2 Power Phase 2 Frequency Phase 2 Power Factor Phase 3 Voltage Phase 3 Current Phase 3 Power Phase 3 Frequency Phase 3 Power Factor Phase 4 Voltage Phase 4 Current Phase 4 Power...
Page 47 EZMeter Password. The EZmeter password is used during meter configuration only. The password is tied to the assigned serial number for the meter and so is different from meter to meter, and is generated within the factory calibration system. It is one register (16 bits) long. Protection Level A read of this register gives a single numeric digit in the range 0 to 4 and indicates the current security level.
Page 48 The value of 0FF corresponds to 19,200 baud using EZPlus Protocol. The default value for Modbus is 0DF (19,200 baud using 8 data bits and a 9th even parity bit). Response Delay The lower byte of this register controls the incremental delay (over and above the minimum inter- data delay specified in the document “MODBUS Over Serial Line Specification and Implementation Guide V1.02"), between the end of the data block received from the host and the time the meter starts to transmit its reply.
Page 49: Ezmeter Power Suite Quick Start Guide
EZMeter Power Suite Quick Start Guide Plan and Test. Reading the installation instructions before installing the meters can save a lot of time later. Similarly, setting up the software and connecting one or two meters in the shop can save a lot of time and anxiety later if you have trouble communicating with the meters after they have been installed.
Page 50 restart the server as it only reads the schedule when it starts up. Click Comm Server in the menu bar and the program will tell you whether the server is running or not. EZServer Meter Communication Server Setup. This section controls the service that reads the meters. While the program can be run as a regular Windows program, that option is advisable only for users who want occasional readings, perhaps once a month for billing purposes.