Acuvim L Manual - K - Tech, Inc.

Chapter 1 IntroductionCharacteristics of Acuvim-LApplication fieldsAcuvim-L Series1

Acuvim-L1.1 Characteristics of Acuvim-LMultifunction, high accuracyAcuvim-L series multifunction power meter is designed using latestmicroprocessor and digital signal process technology. It can measurevoltage, current, active power, reactive power, power factor for threephases, and also the apparent power, harmonic content up to 15 th ,THD,real and reactive energy, demand current and power, max/min values forreal time readings. Expanded digital output and RS-485 communicationinterface perform the functions of energy pulse output, event alarm,remote data collection and control etc. You can read the measuring dataeven in dim environment easily with large and high clarity LCD screen.Except for strong function, Acuvim-L can also save you money.Small size, easy installationThe installation dimension is according to IEC DIN (96×96mm square)and ANSI C39.1 (4 inch round) standard, the installation thickness is only51mm, Acuvim-L power meter can be installed in a small cabin. And alsowith the self-fasten design, the Acuvim-L meter can be easily installedand removed without fasten bolt.Easy to useAcuvim-L has large screen, high clarity LCD and bright backlight,so you can read the data very easy even in dim environment. All thereadings and setting parameters can be accessed by using the panel keysor communication port. The setting parameters are stored in EEPROMwhich can maintain its content even if the power of Acuvim-L shut off.

Flexible wiring connectionWhether in high or low voltage system; whether in 3-phase 3-wire,3-phases 4-wire or single-phase system, Acuvim-L is easily to use.1.2 Application fieldsAcuvim-L series can work as Remote Terminal Unit (RTU) for collectingremote data and controlling in SCADA system, and also can work asmultifunction power meter for monitoring and measuring in powerdistribution automation system. Acuvim-L adopts real RMS measuremethod and digital signal process technology so that it’s especially fit forserious environment with nonlinear load. The main application fields are:Acuvim-LPower Distribution AutomationIndustry AutomatonEnergy Manage System1.3 Acuvim-L seriesIntelligent Electric Switch GearBuilding AutomationLarge UPS systemThe Acuvim-L series have three kinds of products. They are Acuvim-AL (basic model), Acuvim-BL (basic model+2do) and Acuvim-CL (basicmodel+RS485). All functions shows in table 1-1.Real timeMeasuringTable 1-1 Functions of Acuvim-L seriesFunction Parameters AL BL CLPhase voltage U1, U2, U3 ● ● ●Line voltage U12, U23, U31 ● ● ●Current I1, I2, I3, In ● ● ●Power P1,P2,P3,Psum ● ● ●

Acuvim-LReal timeMeasuringEnergy& demandPower QualityStatisticsReactive Power Q1,Q2,Q3,Qsum ● ● ●Apparent Power Ssum ● ● ●Power Factor PF1,PF2,PF3,PF ● ● ●Load Character L/C/R ● ● ●Real Energy Ep_imp, Ep_exp, ● ● ●Reactive Energy Eq_imp, Eq_exp, ● ● ●Current Demand Dmd_I1,Dmd_I2 Dmd_I3 ● ● ●Power Demand Dmd_Psum, Dmd_Qsum ● ● ●Voltageunbalance factorCurrentunbalance factorVoltage THDCurrent THDVoltageHarmonicsCurrentHarmonicsPeak powerdemandPeak currentdemandU_unbl ● ● ●I_unbl ● ● ●THD_V1, THD_V2,THD_V3,THD_I1, THD_I2,THD_I3,● ● ●● ● ●2nd to 15st ● ● ●2nd to 15st ● ● ●Dmd_I1_max,Dmd_I2_max,Dmd_I3_maxDmd_Psum_max,Dmd_Qsum_max● ● ●● ● ●Max/Min voltage ● ● ●Max/Min Current ● ● ●Time Running Time Hour ● ● ●I/OPulse outputAlarm output●●Communication RS-485 MODBUS TM Protocol ●Note: ● Possessed functions

Chapter 2 InstallationAppearance and DimesionsInstallation methodWiring of Acuvim-L65

Acuvim-LConsiderations When Installing Meters Installation of the Meter must be performed by only qualified personnelwho follow standard safety precautions during all procedures. Thosepersonnel should have appropriate training and experience with highvoltage devices. Appropriate safety gloves, safety glasses and protectiveclothing are recommended. During normal operation of the Meter, dangerous voltages flow throughmany parts of the meter, including: Terminals and any connected CTs(Current Transformers) and PTs (Potential Transformers), all I/O Modules(Inputs and Outputs) and their circuits. All Primary and Secondary circuitscan, at times, produce lethal voltages and currents. Avoid contact with anycurrent-carrying surfaces. Do not use the meter or any I/O Output Device for primary protection orin an energy-limiting capacity. The meter can only be used as secondaryprotection. Do not use the meter for applications where failure of the metermay cause harm or death. Do not use the meter for any application wherethere may be a risk of fire. All meter terminals should be inaccessible after installation. Do not apply more than the maximum voltage the meter or any attacheddevice can withstand. Refer to meter and/or device labels and to theSpecifications for all devices before applying voltages. Do not HIPOT/Dielectric test any Outputs, Inputs or Communications terminals. ACCUENERGY recommends the use of Shorting Blocks and Fuses forvoltage leads and power supply to prevent hazardous voltage conditionsor damage to CTs, if the meter needs to be removed from service. CTgrounding is optional. ACCUENERGY recommends use dry cloth to wipe the meter.

Acuvim-LNOTE: IF THE EQUIPMENT IS USED IN A MANNER NOTSPECIFIED BY THE MANUFACTURER, THE PROTECTIONPROVIDED BY THE EQUIPMENT MAY BE IMPAIRED.NOTE: THERE IS NO REQUIRED PREVENTIVE MAINTENANCE ORINSPECTION NECESSARY FOR SAFETY. HOWEVER, ANY REPAIR ORMAINTENANCE SHOULD BE PERFORMED BY THE FACTORY.DISCONNECT DEVICE: The following part is considered theequipment disconnect device.A SWITCH OR CIRCUIT-BREAKER SHALL BE INCLUDED IN THE END-USE EQUIPMENT OR BUILDING INSTALLATION. THE SWITCH SHALLBE IN CLOSE PROXIMITY TO THE EQUIPMENT AND WITHIN EASYREACH OF THE OPERATOR. THE SWITCH SHALL BE MARKED AS THEDISCONNECTING DEVICE FOR THE EQUIPMENT.

Acuvim-LThis chapter tells you how to install Acuvim-L power meter. Please read thischapter carefully before your installation.2.1 Appearance and Dimensions of Acuvim-LAppearance125387469Figure.2-1 Appearance of Acuvim-L

1 EnclosureParts2 Front casing3 LCD display4 key5 Voltage input terminals6 Current input terminals7 Power input terminals8 RS-485 or digital outputterminals9 Installation clipsDescriptionMade of high strength anti-combustion engineeringplasticRevealed out of PanelLarge bright LCD displaySelect what to be displayed and set ParameterVoltage inputsCurrent inputsPower supply inputsRS-485 port is used to communication; digital outputport is used for pulse output or alarm output.Used to fix the power meterAcuvim-LDimensions (mm)Table 2-1 Parts of Acuvim-LFront viewFig.2-2 Dimensions of Acuvim-LSide view

Acuvim-L2.2 Installation of Acuvim-LNoteTe m p e r a t u r ea n d h u m i d i t y o ft h e e n v i r o n m e n tmust accord withthe requirement ofacuvim-L, Otherwiseit may cause themeter damaged.EnvironmentPlease check the environmental temperaturea n d h u m i d i t y a c c o r d i n g t o A c u v i m - L’srequirement to ensure the power meter canwork well.1.TemperatureOperation: -20℃ to 70℃ Storage: -40℃ to85℃2.Humidity5% to 95% No condensation3、LocationAcuvim-L power meter should be installed in dry environment with nodust and kept away from heat, radiation and high electrical noise source.Installation stepsNormally, Acuvim-L is installed on the panel of the switch gear.1、firstly, cut a square or round hole which according to the standardof DIN or ANSI on the panel of the switch gear. The cutting size shows asFig.2-3.unit (mm)Cutting +0.5-0.0101.6+0.5-0.0Panel +0.5-0.0Panel10Fig.2-3 Panel cutting

2、secondly, remove the clips from the meter and put Acuvim-L intothe square hole from the front side.Acuvim-LPanelPanelFig.2-4 Put the meter into the square3、Finally, put the clips to the meter from backside and push the cliptightly so that the meter is fixed on the panel.PanelFig.2-5 Use clips to fix the meter11

Acuvim-L2.3 Wiring connection of Acuvim-LThere are four or three terminal strips on the back of Acuvim-Laccording to different model. They are voltage input terminal strips,current input terminal strips, DO output terminal strips or communicationterminal strips and power supply terminal strips. The 1, 2 and 3 are usedto represent each phase of three phase system. They have the samemeaning as A, B and C or T, S and T in three phase system.Current input terminal strips!I11 I1 I1 I I1 I1 5 6Voltage input terminal strips V1 V V10VNPower supply terminal strips11 1 1L / + N /–Power Supply12

Communication terminal stripsAcuvim-LDigital output terminal stripsComm PortA B S1 15 16Fig.2-6 Terminal diagram of Acuvim-LNote:Model Acuvim-AL has no digital output and communication terminalstrips, Model Acuvim-BL has digital output terminal strips only andAcuvim-CL has communication terminal strips only.DangerOnly the qualifiedpersonnel could do thewire connection work.Make sure that thepower supply is cut offand all the wires arepowerless. Failure toobserve it may result insevere injury or death.Digital OutputDO 1 DO DOC1 15 16Safety Earth ConnectionB e f o r e d o i n g t h e m e t e r w i r i n gconnection, please make sure that theswitch gear has a safety Earth system.Connect the meter safety earth terminal tothe switch gear safety earth system. Thefollowing safety earth symbol is used in thisuser’s manual.Fig.2-7 Earth ground symbol13

Acuvim-LNoteMake sure thevoltage of powersupply is the sameas what the metern e e d e d f o r i t sauxiliary power.Auxiliary powerThe auxiliary power supply of the Acuvim-Lis 100~415Vac (50/60Hz) or 100V~300Vdc.Typical power consumption of the meter is lessthan 2W. A regulator or a UPS should be usedwhen the power supply undulates too much.The terminals for the auxiliary power supplyare 11, 12 , 13 (L, N, ).The typical wiring connection is shown as Fig.2-8.Power Supply1A FUSE11 L1 NAcuvim-LGround1Fig.2-8 wiring connection of power supplyThe wire of power supply could be AWG22-16 or 0.6-1.3mm 2 . A fuse(typical 1A/250Vac) should be used in auxiliary power supply loop. No.13terminal must be connected to the safety earth system of switchgear. Anisolated transformer or EMC filter should be used in the auxiliary powersupply loop if there is power quality problem in the power supply.14

Power Supply1A FUSELNLN111LNAcuvim-LAcuvim-LGroundGG1EMC FilterFig.2-9 wiring connection of auxiliary power supply w ith EMC filtersVoltage inputInput Voltage of Acuvim-L should be 40~400Vac L-N, 70~690Vac L-L.The meter is suitable for low voltage or high or medium voltage systemthree phase system which voltage or secondary of PT lower than thisrange.NoteThe secondaryof PT can not beshorted; otherwiseit may cause thesevere damage ofthe instrument.A fuse (typical 1A) should be used in voltageinput loop. PT should be used to transformthe high voltage into measurement range ofAcuvim-L if it is used in high voltage system.The wire number of voltage input could beAWG16-12 or 1.3-2.0mm 2 .Note: In no circumstance could thesecondary of PT be shorted. The secondary ofPT, should be well grounded at one end.15

Acuvim-LCurrent inputIn a practical engineering application, CTs should be installed in theloop of measuring. Normally the secondary of CT is 5A. 1A is possiblein the ordering option. A CT of accuracy over 0.5% (rating over 3VA) isrecommended and it will influence the measuring accuracy. The wirebetween CT and Acuvim-L should be as shorter as possible. The lengthof the wire may increase the error of the measurement. CTs must berequired if the rated current over 5A.The wire number of current input could be AWG15-10 or 1.5-2.5mm 2 .Note: The CT loop should not be open circuit in any circumstancewhen the power is on. There should not be any fuse or switch in the CTloop and one end of the CT loop should be well connected to the ground.Vn connectionVn is the reference point of Acuvim-L voltage input. The lower is thewire resistance the less is the error.Three phase wiring diagramAcuvim-L can satisfy almost all kinds of three phase wiring diagram.Please read this part carefully before you begin to do the wiring so thatyou may chose a wiring diagram suitable for your power system.The voltage and current input wiring mode can be set separately in themeter parameter setting process. The voltage wiring mode could be3-phase 4-line Wye (3LN), 3-phase 4-line 2PT Wye mode (2LN), 3-phase3-line open delta (2LL) and 3-phase 3-line direct connection mode (3LL).The current input wiring mode could be 3CT, 2CT and 1CT. Any voltagemode could be group with one of the current mode.Voltage Input Wiring16

3-Phase 4-Line Wye mode (3LN)The 3-Phase 4-Line Wye mode is popularly used in low voltageelectric distribution power system. The power line can be connected tothe meter voltage input directly as in fig.2-10a. In the high voltage inputsystem, 3PT Wye mode is often used as in fig.2-10b. The voltage inputmode of the Acuvim-L should be set 3LN for both voltage input wiringmode.Acuvim-LLINEA B C N1A FUSEV1 V VAcuvim-L10VNLOADFig.2-10a 3Ln direct connectionLINEA B C N1A FUSEV1VAcuvim-LV10 V NLOADFig.2-10b 3Ln connection with 3PTs17

Acuvim-L3-Phase 4-Line 2PT mode (2LN)In some 3-Phase 4-Line Wye system, 2PT Wye mode is often usedas in Fig.2-11. It is supposed that the 3 phases of power system arebalanceable. The voltage of V2 is calculated according to the V1 andV3. The voltage input mode of the Acuvim-L should be set 2LN for 2PTvoltage input wiring mode.LINEA B C N1A FUSEV1VAcuvim-LV10V NLOADFig.2-11 2Ln connection with 2PTs3-Phase 3-Line direct connection mode (3LL)In a 3-Phase 3-Line system, power line A, B and C are connected toV1, V2 and V3 directly. Vn is floated. The voltage input mode of theAcuvim-L should be set 3LL.LINEA B C1A FUSEV1 V VAcuvim-L10VN18LOADFig.2-12 3LL 3-phase 3-line direct connection

3-Phase 3-Line open Delta Mode (2LL)Open delta wiring mode is often used in high voltage system. V2and Vn connected together in this mode. The voltage input mode of theAcuvim-L should be set 2LL for voltage input wiring mode.LINEA B CAcuvim-L1A FUSEV1VAcuvim-LV10 VnCurrent Input Wiring3CTLOADFig.2-13 2LL with 2PTsAll the current input of three phase system can be looked as 3CT one,whether there are 2 CTs or 3 CTs in the input side. The current input modeof the Acuvim-L should be set 3CT for this current input wiring mode.LINEA B CTerminal block51I116I1 I1 IAcuvim-L5I16ILOADFig.2-14 3CT-a19

Acuvim-LLINEA B CTerminal block51I116I1 I1 IAcuvim-L5I16ILOAD2CTFig.2-15 3CT-bThe difference of the fig.2-16 and the fig.2-15 is that there is nocurrent input in the I21 and I22 terminals. The I2 value is calculatedfrom formula i1+i2+i3=0. The current input mode of the Acuvim-L shouldbe set 2CT for this current input wiring mode.LINEA B CTerminal block51I116I1 I1 IAcuvim-L5I16ILOADFig.2-16 2CT201CTIf it is a three phase balance system, 1 CT connection method can be

used. All the other two current are calculated according to the balancesupposing.LINEA B CAcuvim-LTerminal block51I116I1 I1 IAcuvim-L5I16ILOADFrequently used wiring methodFig.2-17 1CTThe voltage and current wiring method are put together in onedrawing. The Acuvim-L meter will display normally only that the settingof the meter is assorted with the wiring of the voltage and current input.1. 3LN, 3CT with 3 CTs (Wiring mode: 3Ln, 3CT)LINEA B CN1A FUSETerminal block51I11106I1VN VVV1 I1 IAcuvim-L5I1LOADIFig.2-18 3Ln, 3CT with 3CTs621

Acuvim-L6. 2LL, 2CT (Wiring mode: 2LL, 2CT)LINEA B C1A FUSETerminal block51I11106I1VNVVV1 I1 IAcuvim-L5I16ILOADFig.2-23 2LL, 2CT7. 2LL, 1CT (Wiring mode: 2LL, 1CT)LINEA B C1A FUSETerminal block51I11106I1VNVVV1 I1 IAcuvim-L5I16ILOAD24Fig.2-24 2LL, 1CT

8. Single Phase 2 Line (wiring mode: 3LN, 3CT)LINEA N1A FUSEAcuvim-LTerminal block51I11106I1VNVVV1 I1 IAcuvim-L5I16ILOADFig.2-25 Single Phase 2 Lines9. Single Phase 3 Line (Wiring mode: 3LN, 3CT)LINEA N B1A FUSETerminal block51I11106I1VNVVV1 I1 IAcuvim-L5I16ILOADFig.2-26 Single Phase 3 Lines25

Acuvim-LDigital output (DO)There are two digital outputs for Acuvim-BL. The terminals of thedigital output are DO1, DO2 (14, 15) and DOC (16). These two digitaloutputs can be used as energy pulse output or over limit alarming output.Digital output circuit form is Photo-MOS. The simplified circuit is asbelow:VCCJPhoto-MOSAcuvim-LDO1OUTDOCExternalPower SupplyAC /DCFig.2-27 Digital output circuitThe Max output voltage and current are 250Vac/300Vdc and 50mA.When the digital output is used as over limit alarm output, the up andlow limit of the parameter, time interval and output port can be set.CommunicationThe communication port and protocol of Acuvim-L are RS485 andModbus-RTU. The terminals of communication are A, B, and S (14, 15 and16). A is differential signal +, B is differential signal - and S is connectedto shield of twisted pair cable. Up to 32 devices can be connected ona RS485 bus. Use good quality shielded twisted pair cable, AWG22(0.5mm 2 ) or larger. The overall length of the RS485 cable connectingall devices can not exceed 1200m (4000ft). Acuvim-L is used as a slavedevice of master like PC, PLC, data collector or RTU.26

If the master does not have RS485 communication port, a converterhas to be used. Normally a RS232/RS485 or USB/RS485 is adopted. Thetopology of RS485 net can be line, circle and star.The recommendations for the high quality communication, Goodquality shielded twisted pair of cable AWG22 (0.6mm 2 ) or larger is veryimportant.The shield of each segment of the RS485 cable must be connected tothe ground at one end only.Keep communication cables away as much as possible from sources ofelectrical noise.Use RS232/RS485 or USB/RS485 converter with optical isolated outputand surge protection.Acuvim-L27

Acuvim-L28

Chapter 3 Meter Operationand Parameter SettingDisplay panel and keysMetering data readingStatistics displayMeter Parameter SettingIntroduction of measurement and functions29

Acuvim-LDetail human-machine of the meter will be described in this chapter.This includes how to get the metering data and set the parameter of themeter.3.1 Display panel and keysThere are one display panel and four keys in front of Acuvim-L. Alldisplay segments are shown as Fig.3-1 below:Fig.3-1 All display segments30

SN display Description12Three lines of " "letterin the metering areaStatus display areaOne line "" letter atthe top of display panel3 Item label4 3-phase unbalance Unbalance label5 Load natureDisplay metering dataVoltage, current, power, power factor, THD,frequency, demand, unbalance factor, max, min etc.Display currant statusMeter: metering status; Max: maximum value; Min:minimum value; THD: display THD: Har: display datais harmonic.Item labelU: voltage,I: Current, P: active power; q: reactivepower; PF: power factor; when display harmonicrate, the little 8 letter displays harmonic number.Capacitor label: capacitive load;Inductor label: inductive load.6 Energy label Imp: consumption energy; exp: generating energyAcuvim-L7Communication indicator No label: no communicationWith label: communication8Energy pulseoutput indicator.No label: no pulse outputWith label: pulse output9 Time label With label: display running time10 UnitIndicate data unitVoltage: V, kV, Current: kA, A, Power: kW and MW,Reactive Power: kvar and Mvar, Apparent Power:kVA and MVA, Frequency: Hz, Energy: kWh, ReactivePower: kvarh, Percentage: %There are four delicate keys in the front panel, labeled as H, P, E andV/A from left to right. Use these four keys to read metering data and setthe parameters.31

Acuvim-L3.2 Metering data readingNormally, Acuvim-L displays the metering data, such as voltage,current, power etc. There are several key patterns: press key “H”, presskey “P”, press key “E”, and press key “V/A”, press key “H” and key Esimultaneously.Press “V/A” to read voltage and current in the metering area. Thescreen will roll to the next display as you press “V/A” each time. It willgo back to the first screen if you press “V/A” at the last screen.Fig.3-2 Three phase voltageThe 1 st screen: display U1, U2 and U3 asFig.3-2: U1=380.2V, U2=380.0V, U3=379.8V.L o a d n a t u r e i s i n d u c t i v e , a n dcommunication is normal.Note: load nature and communicationstatus is system information, they willdisplay in every screen.Press V/A, go to next screen.The 2 nd screen: display voltage of line toline as shown in Fig.3-3:U12=658.5V, U23=658.0, U31=657.8.Press “V/A, go to the next screen.Fig.3-3 Three phase voltage32

The 3 rd screen: display current of eachphase I1, I2 and I3 shown as Fig.3-4:I1=2.501A I2=2.500A, I3=2.499A.Acuvim-LPress “V/A”, go to the next screen.Fig.3-4 Three phase currentThe 4 th screen: display neutral current.As in Fig.3-5, In=0.000A.Press “V/A”, go to the next screen.Fig.3-5 Neutral currentFig.3-6 Demand currentThe 5 th screen: display current demandof each phase.As in Fig.3-6, Dmd_I1=2.503A,Dmd_I2=2.501A, Dmd_I3=2.500A.Press “V/A”, go back to the 1st screen.Note: when the voltage wiring of the meter is set to 2LL, there is nophase voltage and natural current screen, namely no 1st and 4th screen,only 2nd, 3rd and 5th screen.33

Acuvim-LPress “P” key, display metering readings related power.The 1 st screen: display the power of eachphase.As in Fig.3-7, P1=0.475kW, P2=0.475kW,P3=0.474kW.Inductive load, communication status isnormal.Fig.3-7 Three phase powerPress “P”, go to the next screen.The 2 nd screen: display the reactivepower of each phase.A s i n F i g . 3 - 8 , Q 1 = 0 . 8 2 3 k v a r,Q2=0.823kvarQ3=0.822kvar.Fig.3-8 Three phase reactivePress “P”, go to the next screen.The 3 rd screen: display system totalpower, reactive power and apparent power.As in Fig.3-9, Psum=1.426kW,Qsum=2.471kvar, Ssum=2.853kVA.34Fig.3-9 Power reactive andapparent powerPress “P”, go to the next screen.

The 4 th screen: display power factor ofeach phase PF1, PF2, PF3.As in Fig.3-10, PF1=0.500, PF2=0.499,PF3=0.500.Acuvim-LPress “P”, go to the next screen.Fig.3-10 Three phase powerfactorThe 5 th screen: display system averagepower factor PF and system frequency F.As in Fig.3-11, PF=0.500, F=50.01Hz.Press “P”, go to the next screen.Fig.3-11 Power factor andfrequencyThe 6 th screen: display system powerdemand Dmd_P and reactive power demandDmd_Q.As in Fig.3-12, Dmd_P=1.425kW,Dmd_Q=2.472kvar.Fig.3-12 System power demandPress “P”; go back to the 1st screen.Note: when the voltage wiring of the meter is set to 2LL or 3LL, thereis no phase power, phase reactive power and phase power factor screen.Only the 3rd, 5th and 6th screen displayed.35

Acuvim-LPress “E” key: display energy and run time.The 1 st screen: display the consumptionenergyEp_imp=50.9kwh as in Fig.3-13.Press “E”, go to the next screen.Fig.3-13 import energyThe 2 nd screen: display the generationenergy.Ep_exp=1.8kwh as in Fig.3-14.Press “E”, go to the next screen.Fig.3-14 Export reactive energyThe 3 rd screen: display the inductivereactive energy.Eq_imp=3.9kvarh as in Fig.3-15.Fig.3-15 import reactive energyPress “E”, go to the next screen.36

The 4 th screen: display the capacitivereactive energy.Eq_exp=1.5kvarh as in Fig.3-16.Acuvim-LPress “E”, go to the next screen.Fig.3-16 Export reactive energyThe 5 th screen: display the run time.As in Fig.3-17, Run_Hour=12.3 hours.Press “E”, go back to the 1 st screen.Fig.3-17 Run timePress “H” key, display data of power quality.Fig.3-18 Voltage THD of phaseThe 1 st screen: display THD of voltage.The display will be THD of line to linevoltage THD_U12, THD_U23, THD_U31 whenthe wiring of voltage input is 2LL or 3LL. Thedisplay will be THD of phase voltage THD_U1,THD_U2, THD_U3 when the wring of thevoltage input is 2LN or 3LN.A s i n F i g . 3 - 18 , T H D _ U 1= 2 . 3 2 % ,THD_U2=2.35%, THD_U3=2.28%.37

Acuvim-LWhen the wiring of the voltage is set tobe “2LL or 3LL, the display will be THD ofline to line voltage.As in Fig.3-19, THD_U12=2.30%,THD_U23=2.28%, THD_U31=2.25%.Fig.3-19 Voltage THD of line tolineFig.3-20 Current THDPress “H” key, go to the next screen.The 2 nd screen: display THD of phasecurrent THD_I1, THD_I2, THD_I3.As in fig 3.20, THD of three phasecurrent, THD_I1=1.89%, THD_I2=1.83%,THD_I3=1.85%.Press “H” key; go back to the 1stscreen.3.3 Statistics DisplayPress the “E” and “H” Keys simultaneously, the Max and Min valueof metering data, three phase voltage and current unbalance factor andharmonic rate will display on the screen.38Press the “E” and “H” Keys simultaneously, go to the statistics screen.3.3.1 Display Max and Min of the voltage and current and peak valueof current demand.

The 1 st screen: Display the Max value ofvoltage. The Max label display on the topof screen.Acuvim-LAs in Fig. 3-21, U1_max=380.3V,U2_max=380.2V, U3_max=380.5V.Fig.3-21 Max value of phasevoltagePress “V/A” key under the statistics display mode, to display the Minand Max value of voltage, current and current demand.The 2 nd screen: display the Min value ofvoltage. The Min label display on the top ofscreen.As in Fig.3-22 ,U1_Min=379.6V,U2_Min=379.8V,U3_Min=379.7V.Fig.3-22 Min value of phasevoltagePress “V/A”, go to the next screen.The 3 rd screen: display the Max value ofline to line voltage.As in fig 3.23 U12_Max=658.6V,U23_Max=658.3V,U31_Max=658.3V.Press “V/A”, go to the next screen.Fig.3-23 Max value of line toline voltage39

Acuvim-LThe 4 th screen: display the Min value ofline to line voltage.As in Fig.3-24 U12_Min=657.8V,U23_Min=657.7V,U31_Max=657.6V.Press “V/A”, go to the next screen.Fig.3-24 Min value of line toline voltageThe 5 th screen: display the Max value ofcurrent.As in Fig.3-25 I1_Max=2.502A,I2_Max=2.503A,I3_Max=2.502A.Fig.3-25 Max value of currentPress “V/A”, go to the next screen.The 6 th screen: display the Min value ofcurrent.As in fig.3-26 I1_Min=2.498A,I2_Min=2.496A,I3_Min=2.497A.Press “V/A”, go to the next screen.Fig.3-26 Min value of current40

The 7 th screen: display the Max value ofcurrent demand.As in fig 3.27 I1_Demand_Max=2.505A,I2_Demand_Max=2.504A,I3_Demand_Max=2.504A.Press “V/A” key; go back to the 1st screen.Acuvim-LFig.3-27 Max value of demandcurrent3.3.2 Display the Max value of power and reactive power demand.Press “P” key under the statistics displaymode, to display the Max value of powerand reactive power demand.A s i n F i g . 3 - 2 8 P _ D e m a n d _ M a x =1.435kW,Q_Demand_Max=2.478kvar.Fig.3-28 Max value of demandpower and reactive powerNote: when the wiring of voltage inputis set to 2LL or 3LL, there is no the 1st and2nd screen.3.3.3 Display power quality parameterPress “H” key under the statistics displaymode, to display the unbalance factor ofvoltage and current and harmonic rate ofvoltage and current.Fig.3-29 Unbalance factor ofvoltage and currentThe 1 st screen: display three phasevoltage unbalance factor and three phasecurrent unbalance factor.41

Acuvim-LAs in fig.3-29 voltage unbalance factor=0.3%,current unbalancefactor=0.5%.Press “H” key, go to the next screen.Press “H” key to display harmonic rate of voltage and current. Thescreen will roll from 2 nd harmonic rate of voltage to 15 th harmonic rateof current as you press “H” each time. The HARMO label displays onthe top of screen. The following screens show the 2 nd and 16 th screen asexample.The 2 nd screen: display 2 nd harmonic rateof voltage.As in fig.3-30, U1_Hr2=0.12%, U2_Hr2=0.12% , U3_Hr2=0.12%.Fig.3-30 2nd harmonic rate ofphase voltageNote: when the wiring of voltage input isset to 2LL or 3LL, there is no harmonic rateof phase voltage; the harmonic rate of lineto line voltage will be shown as in Fig.3-30.The 2 nd screen: display 2 nd harmonic rateof line to line voltage.As in Fig.3-31, U12_Hr2=0.12%, U23_Hr2=0.14% , U31_Hr2=0.12%.Fig.3-31 2nd harmonic rate ofline to line voltagePress “H” key in turn, display 3 rd to 15 thvoltage harmonic rate, the correspondingscreen is 3 rd to 15 th.42

The 16 th screen: display 2nd harmonicrate of current.Acuvim-LAs in Fig.3-32, I1_Hr2=3.08%, I2_Hr2=3.05% , I3_Hr2=3.01%.Fig.3-32 2nd harmonic rate ofcurrentPress “H” key in turn, display 3 rd to 15 thcurrent harmonic rate, the correspondingscreen is 17 th to 29 th .3.4 System parameter setting of Acuvim-LNoteThe setting shouldb e d o n e b y t h eprofessional personnelwho have read theuser’s manual andu n d e r s t o o d t h eapplication situation.NoteW h e n w e p r e s sH a n d V / A k e y ssimultaneously toe x i t t h e s e t t i n gmode, the setting ofcurrent page will notbe stored.Under the metering data display mode, pressthe “H” and “V/A” key simultaneously, get intosystem parameter setting mode of the meter. Allof the settings can be done through the keys onthe panel.Under the meter parameter setting mode,press “H” key to move cursor. Right move onedigit each time. Press “P” for increasing andpress “E” for decreasing. Press “V/A” foracknowledgment and going to the next settingi t e m p a g e . Pr e s s “ H ” a n d “ V / A ” k e y ssimultaneously to exit from any setting itempage.Access code is needed for going into thesystem parameter setting mode. Only the personwho knows the access code can do the parametersetting. The access code is 4 digits decimalnumber. It is from 0000 to 9999. The factory43

Acuvim-Ldefault is 0000. After key in the right access code, press “V/A” to go tothe first parameter setting page, otherwise go back to the metering datadisplay page.Fig.3-32 is the access code page.Fig.3-32 Access code pageFig.3-33 Address setting pageFig.3-34 Baud rate setting pageThe 1 st screen: setting Acuvim-L addresspage for commutation purpose. It is anydigit number from 1-247. it’s shown asFig.3-33: the address of Acuvim-L is 1.Press “H” to move the cursor to thedigit that needed to be changed, press “P”for increasing and press “E” for decreasing,press for the acknowle- dgment.Note: every meter should have differentaddress according to the Modbus-RTUprotocol in the same RS-485 net.The 2 nd screen: baud rate setting page.The asynchronous communication settingof Acuvim-L is 8 bit, no parity, 1 start bit and1 stop bit. Baud rate can be set as follows:1200, 2400, 4800, 9600, 19200, 38400. PressP or E to change the baud rate.Press “V/A”, go to the next screen.44

Acuvim-LFig.3-35 Voltage input wiringThe 3 rd screen: voltage input wiringsetting page. Voltage input could be one offour modes, 3Ln, 2Ln, 2LL and 3LL.As in Fig.3-35: the voltage input mode is setto 3Ln.Press “V/A”, go to the next screen.The 4 th screen: current input wiringsetting page. Current input could be one ofthree modes, 3Ct, 1Ct and 2Ct.As in Fig.3-36: the current input mode is setto 3Ct.Press “V/A”, go to the next screen.Fig.3-36 Current input wiringFig.3-37 PT primaryThe 5 th screen: PT primary rating voltagePT1 setting page.The value range of PT1 is from 50.0-1000,000.0. Unit is volt.As in Fig.3-37, PT1=380.0V, press “H”,“E” and “P” to change the value. Press “V/A” key for acknowledgement and go to nextpage.45

Acuvim-LFig.3-38 PT secondaryThe 6 th screen: PT secondary ratingvoltage PT2 setting page.T h e v a l u e r a n g e o f P T 2 i s f r o m50.0-400.0. Unit is Volt.As in Fig.3-38, PT2=380.0V, press “H”, “E”and “P” to change the value. Press “V/A” keyfor acknowledgement and go to next page.Note: If there is no PT on the voltage input side of Acuvim-L, the PT1and PT2 should be the same and equal to the input rated voltage.Fig.3-39 CT primaryThe 7 th screen: CT primary rating currentCT1 setting page.CT1 is an integer from 5-50000. Unit isAmp.As in Fig.3-39, CT1=5A, press “H”, “E”and “P” to change the value. Press “V/A”key for acknowledgement and go to nextpage.Fig.3-40 CT secondaryThe 8 th screen: CT secondary ratingcurrent CT2 setting page.CT2 is a constant equal 5. unit is Amp.If 1A specification needed, it should beordered.As in Fig.3-40, CT1=5A, Press “V/A” key,go to next page.46

Fig.3-41 Definition of reactivepowerFig.3-42 Back light “on” timeThe 9 th screen: definition setting ofreactive power.0: sinusoidal reactive power;1: Budeanu’s reactive power.Please refer to >for details.The 10 th screen: back light “on” timesetting page.The “on” time can be set from 0 to 120Minute. The back light will always be “on”if the setting value is 0. If it is other value,it means after the setting time it will goesoff if no key has been pressed. It will be “on”whenever you press any key if it is “off”.As in Fig.3-42, the setting time of backlight is 2 minute, namely the back light willgo “off” automatically if there is no touchon the keys.Acuvim-LFig.3-43 Sliding windows timeThe 11 th screen: sliding windows time ofdemand setting page.Sliding windows time of demand is from1-30 minute. The window slides once perminute.As in Fig.3-43, the sliding windows timeis 8 minute.47

Acuvim-LFig.3-44 Clear Max and Min pageThe 12 th screen: the setting page ofclearing Max and Min.The Max and Min value of Acuvim-L canbe cleared via panel, and then the new datais registered.Press “P” or “E” to select “yes” or “No”:No: do not clear Max and Min;Yes: clear Max and Min.Press “V/A” key, go to next page.Fig.3-45 Clear energy enableThe 13 th screen: clear energy enablesetting page.The energy of Acuvim-L can be cleared viapanel, and then the new data is registered.1: enable; 0: disable.Fig.3-46 Acknowledgement toclear energyThe 14 th screen: the setting page ofacknowledgement to clear energy.Press “E” or “P” to select “yes” or “No”:“Yes”: clear energy;“No”: do not clear energy.Press “V/A” key, go to next page.48

Fig.3-47 Alear running timeThe 15 th screen: the setting page ofclearing running time.The running time of Acuvim-L can becleared via panel, and then the new time isregistered.Press “P” or “E” to select “yes” or “No”:“No”: do not clear running time;“Yes”: clear running time.Acuvim-LPress “V/A”key, go to next page.Fig.3-48 Access code settingThe 16 th screen: access code settingpage.It is the last screen of system parametersetting page. The access code can bechanged in the page. It’s important toremember the new access code.As in Fig.3-48, the access code is 0001.Press “V/A” key, the access code will bestored in Acuvim-L. Press “H” key and “V/A”key to exit the system setting mode whenall the setting has been finished.3.5 DO parameter setting of Acuvim-LAcuvim-BL meter has two digital outputs. Each can operate as energypulse output or alarm output. All parameters about DO can be set viapanel. To distinguish with system parameter setting mode, we call thesetting mode about DO as DO parameter setting mode.49

Acuvim-LPress “H” key and “E” key simultaneity under the system parametersetting mode will enter the DO parameter setting mode. The operationof keys is the same as in pre-setting pages. You need to press “P” and“E” simultaneously to exit and back to system parameter setting mode;press “H” and “V/A” simultaneously to exit the system pentametersetting mode and enter the metering data display page.The following figures show how to set the DO items:Fig.3-49 DO1 output modesettingThe 1 st screen: DO1 output mode settingpage.0: pulse output;1: alarm output.As Fig.3-49, DO1 is set as pulse outputmode.Press “V/A” key for acknowledgementand going to next page.Fig.3-50 DO2 output modesettingThe 2 nd screen: DO2 output mode settingpage.0: pulse output;1: alarm output.As Fig.3-50, DO2 is set as alarm outputmode.Press “V/A” key for acknowledgementand going to next page.50

The 3 rd screen: Pulse rate setting page.Pulse rate means the energy value perpulse. It can be the integer of 1 to 6000.One digit is 0.1kWh or 0.1kVarh.As Fig.3-51, the pulse rate is 10.Acuvim-LFig.3-51 DO pulse rateFig.3-52 DO pulse widthThe 4 th screen: the DO pulse widthsetting.The DO pulse width is integer from 1 to50. One digit is 20ms.As in Fig.3-52, the pulse width is set to5, that is 5×20=100ms.Press “V/A” key for acknowledgementand going to next page.The 5 th screen: DO1 output item setting.The DO1 output can be one of thefollowing energy items shown in tablebelow:As in Fig.3-53, DO1 has no pulse output.Fig.3-53 DO1 output itemsItem value 0 1 2 3 4Energy select No output Ep_imp Ep_exp Eq_imp Eq_exp51

Acuvim-LThe 6 th screen: DO2 output item setting.The same as DO1 for setting, and theydon’t effect each other at all.Press V/A key for acknowledgement andgoing to next page.Fig.3-54 DO2 output itemsFig.3-55 DO delay time of alarmsettingThe 7 th screen: DO delay time of alarmsetting page.When the metering data is over presettinglimit, how long the alarm output isgenerated.The delay time can be an integer from0-255. One digit is 300ms.The 8 th screen: DO1 alarm output itemssetting.The DO1 alarm output can be one ofthe following energy items shown in tablebelow:Fig.3-56 DO1 alarm outputitems52

Var 0 1 2 3 4 5 6 7item Hz V1 V2 V3 V12 V23 V31 I1Var 8 9 10 11 12 13 14 15item I2 I3 In P1 P2 P3 Psum Q1Var 16 17 18 19 20 21 22 23item Q2 Q3 Qsum Ssum PF1 PF2 PF3 PFsumVar 24 25 26 27 28 29 30item U_unbl I_unbl Dmd_P Dmd_Q Dmd_I1 Dmd_I2 Dmd_I3Acuvim-LFig.3-57 DO1 inequality signThe 9 th screen: DO1 inequality signsetting page.0: .As in Fig.3-57, the inequality sign is setto 1, that is when the metering data is overthe pre-setting limit, an alarm output isgenerated.The 10 th screen: the setting page of DO1alarm limit.Setting steps refer to content of digitaloutput.As in Fig.3-58, the DO1 limit is set to1800.Fig.3-58 DO1 alarm limit53

Acuvim-LThe 11 th screen: DO2 alarm output itemssetting.The same is as DO1 for setting.Fig.3-59 DO2 alarm outputitemsThe 12 th screen: DO2 inequality signsetting page.0: .Fig.3-60 DO2 inequality signFig.3-61 DO2 alarm limitThe 10 th screen: the setting page of DO2alarm limit.Setting steps refer to content of digitaloutput.As in Fig.3-61, the DO2 limit is set to4500.This is the last screen of DO parametersetting. Press “V/A” key for acknowledgementand go to the first screen.54

Press “P” key and “E” key simultaneity to exit the setting mode of DOParameter and enter the setting mode of system parameter.Press “H” key and “V/A” key simultaneity to exit the setting mode ofsystem Parameter and enter the metering data display page.Acuvim-L3.6 Introduction of measurement and functions of Acuvim-LAlmost all the electric parameters in power systems can be measuredby Acuvim-L. Some parameters that the users are not familiar will beintroduced in the part.Voltage (U): True RMS value of three phase voltages, three line toline voltages are measured and displayed in Acuvim-L.Current (I): True RMS value of three phase current, neutral currentare measured and displayed in Acuvim-L.Power (P): Three phase power and system total power are measuredand displayed in Acuvim-L.Reactive power (Q): Acuvim-L adopts two definitions of reactivepower.1. Sinusoidal reactive power. The formula is as following:2 2 2 2Q + D = S − P2. Nonsinusoidal reactive power. The formula is as following:' 2Q = Q +D2Where Q D: Budeanu’s distortion power.Q: Budeanu’s reactive power.Apparent power (S): System total apparent power is measured anddisplayed in Acuvim-L.Power factor (PF): Three phase power factor and system total powerfactor are measured and displayed in Acuvim-L.55

Acuvim-LFrequency (F): The frequency of V1 phase voltage input is measuredas system frequency.Energy (kWh): Energy is time integral of power. The unit is kWh.As power has direction, positive means consumption and negativemeans generating. So the energy also has the nature of consumption orgenerating.Import energy (imp): consumption energy.Export energy (exp): generating energy.Reactive energy (kVarh): reactive energy is time integral of reactivepower. The unit is kVarh. As reactive power has direction, positive meansinductive and negative means capacitive. So the energy also has thenature of inductive or capacitive.Import energy (imp): inductive energy.Export energy (exp): capacitive energy.Harmonic parameter:Total harmonic distortion: this factor is often used to express thepower quality of the power system. The formula is as following:50⎛UTHD = ∑⎜h= 2 ⎝ Uh12⎞⎟ × 100%⎠In the formula, U1 is Rms value of the voltage fundamental and Uh isRms value of the voltage harmonic with order n.Each harmonic rate: the percentage of each harmonic divided byfundamental.HRUh= UUh1× 100%HRIh= IIh1× 100%Demand: demand of total power and reactive power of system,demand of three phase current. The demand statistics method in56

Acuvim-L is sliding windows. The sliding window time can be chose from1 to 30 minute. The window slides one minute each time. For example,the sliding window time is supposed to be three minutes. If averagepower of the 1 st minute is 12, that of the 2 nd minute is 14 and that of the3 rd minute is 10, then the total power demand the last three minute is(12+14+10)/3=12 at the end of the 3 rd minute. If another minute passed,the average power of the minute is 9, then the total power demand ofthe last three minute is (14+10+9)/3=11 at the end of the 4 th minute.Unbalance factor: Acuvim-L can measure the unbalance factor ofthree –phase voltage and current using method of sequence vector.Max/Min: Acuvim-L can measure the max value of system total power,reactive power and apparent power and the max/min of the three phasevoltage and current. The value of metering data is stored in NV-RAM andcan be accessed or cleared via control panel or communication.Over limit alarming: In Acuvim-BL, when the metering data is overthe pre-setting limit and over presetting time interval, the over limitalarming will be picked up. The digital output (DO) can be used as triggerto light or sound alarming. An example is given following to describeshow the over limit alarming work.For example:When current Ib goes over 180A and duration is over 15 seconds, anover limit alarming will be generated (Suppose that the Ct ratio is 200),and output via DO1, the setting steps is as following:1) firstly, set the mode of DO1 as alarming output, namely the valueof DO1 mode is set to 1;2) secondly, delay time is 15 seconds, for the basic unit of delay timeis 300ms, the setting value of delay time is 15÷0.3=50.3) Thirdly, alarm parameter is Ib, the value of alarm parameter is setto 8.Acuvim-L57

Acuvim-L4) Ib is greater than 180A, so the alarm inequality sign is set to 1.5) The setting value of alarm limit is calculated as the followingequation:Real value = (setting value×Ct1÷Ct2) ÷1000So the setting value of alarm limit is 4500.Then we have completed the setting of over limit alarming.Energy pulse output: The two digital outputs of Acuvim-BL can beused as energy pulse output. The output energy can be selected amongall kinds of energy and reactive energy. Pulse constant and pulse widthcan be set to meet your requirements. Pulse constant is the kWh apulse stands for; pulse width is the time that a pulse lasts. When theaccumulated energy reaches the pulse constant, there will be a pulse onDO.Related parameters: pulse energy output ranges from 0 to 4corresponding to none, Ep_imp, Ep_exp, Eq_imp, Eq_exp.Pulse constant ranges from 1 to 6000 (integer) with a unit of 0.1kWh(kvarh), apparently that is the resolving power of energy output.Pulse width ranges from 1 to 50 (integer) with a unit of 20ms. Thenarrowest interval between two pulses is 20ms.In practice the pulse width and the pulse ratio are selected accordingto system power. The relation of the two parameters should satisfiedfollowing expression:pulse ratio >[(pulse width +1)×Pmax]÷18000In the expression, the Pmax is the maximum power or reactive power.The unit is kW or kvar. Recommend pulse ratio is 3 to 5 times the rightside value of the above expression.58

Chapter 4 CommunicationIntroducing Modbus ProtocolFormat of CommunicationData Address Table59

Acuvim-LThis chapter will mainly discuss how to operate the meter viacommunication port using software. To master this chapter, you shouldbe familiar with Modbus and read other chapters of this manual to makesure that you have generously mastered the function and application ofthis product.This chapter includes: Modbus protocol, format of communicationand data address table and Acuvim-L application details.4.1 Introducing Modbus protocol60The Modbus RTU protocol is used for communication in Acuvim-L. Thedata format and error check methods are defined in Modbus protocol.The half duplex query and respond mode is adopted in Modbus protocol.There is only one master device in the communication net. The othersare slave devices, waiting for the query of the master.Transmission modeThe mode of transmission defines the data structure within a frameand the rules used to transmit data. The mode is defined in the followingwhich is compatible with Modbus RTU Mode*.* Modbus is trademark of Modicon, Inc.Coding system8-bit binaryStart bit 1Data bits 8ParityNo parityStop bit 1Error checkingCRC check

4.2 Modbus ProtocolAcuvim-LFramingAddress Function Data Check8-bit 8-bit N×8-bit 16-bitTable 4-1 data frame formatAddress fieldThe address field of a message frame contains eight bits. Validslave device addresses are in the range of 0~247 decimal. A masteraddresses a slave by placing the slave address in the address field of themessage. When the slave sends its response, it places its own address inthis address field of the response to let the master know which slave isresponding.Function fieldThe function code field of a message frame contains eight bits. Validcodes are in the range of 1~255 decimal. When a message is sent from amaster to a slave device the function code field tells the slave what kindof action to perform.Code Meaning Action03 Read dataObtain current binary value in one ormore registers16 Preset multiple-registersPlace specific value into a series ofconsecutive multiple-registersTable 4-2 Function code61

Acuvim-LData fieldThe data field is constructed using sets of two hexadecimal digits,in the range of 00 to FF hexadecimal. The data field of messages sentfrom a master to slave devices contains additional information whichthe slave must use to take the action defined by the function code. Thiscan include items like discrete and register addresses, the quantity ofitems to be handled, and the count of actual data bytes in the field.For example, if the master requests a slave to read a group of holdingregisters (function code 03), the data field specifies the starting registerand how many registers are to be read. If the master writes to a groupof registers in the slave (function code 10 hexadecimal), the data fieldspecifies the starting register, how many registers to write, the count ofdata bytes to follow in the data field, and the data to be written into theregisters.If no error occurs, the data field of a response from a slave to amaster contains the data requested. If an error occurs, the field containsan exception code that the master application can use to determinethe next action to be taken. The data field can be nonexistent (of zerolength) in certain kinds of messages.6.Error Check FieldMessages include an error-checking field that is based on a CyclicalRedundancy Check (CRC) method. The CRC field checks the contents ofthe entire message. It is applied regardless of any parity check methodused for the individual characters of the message. The CRC field is twobytes, containing a 16 bit binary value. The CRC value is calculated bythe transmitting device, which appends the CRC to the message.The receiving device recalculates a CRC during receipt of themessage, and compares the calculated value to the actual value it62

eceived in the CRC field. An error results if the two values are notequal. The CRC is started by first preloading a 16-bit register to all 1’s.Then a process begins of applying successive 8-bit bytes of the messageto the current contents of the register. Only the eight bits of data in eachcharacter are used for generating the CRC. Start and stop bits, and theparity bit, do not apply to the CRC.During generation of the CRC, each 8-bit character is exclusive ORedwith the register contents. Then the result is shifted in the direction ofthe least significant bit (LSB), with a zero filled into the most significantbit (MSB) position. The LSB is extracted and examined. If the LSB was a1,the register is then exclusive ORed with a preset, fixed value. If the LSBwas a 0, no exclusive OR takes place. This process is repeated until eightshifts have been performed. After the last (eighth) shift, the next 8-bitbyte is exclusive ORed with the register current value, and the processrepeats for eight more shifts as described above. The final contents ofthe register, after all the bytes of the message have been applied, is theCRC value. When the CRC is appended to the message, the low-orderbyte is appended first, followed by the high-order byte.Acuvim-L4.3 Format of communicationExplanation of frameAddr Fun Data startreg hiData startreg loData #ofregs hiData #ofregs loTable 4-3 Explanation of a frameCRC16HiAs shown in table 4-3 the meaning of each abbreviated word is:Addr: address of slave deviceCRC16Lo06H 03H 00H 00H 00H 21H 84H 65H63

Acuvim-LFun: function codeData start reg hi: start register address high byteData start reg lo: start register address low byteData #of reg hi: number of register high byteData #of reg lo: number of register low byteCRC16 Hi: CRC high byteCRC16 Lo: CRC low byte1. Read Data (Function Code 03)QueryThis function allows the master to obtain the measurement resultsof Acuvim-L. Table 4-4 is an example to read the 3 measured data (F, V1and V2) from slave device number 17, the data address of F is 0130H, V1is 0131H and V2 is 0132H.AddrFunResponseData startaddr hiData startAddr LoData #ofRegs hiData #ofRegs loTable 4-4 Read F, V1 and V2 Query MessageThe Acuvim-L response includes the address code, function code,quantity of data byte, data, and error checking. An example responseto read F, V1 and V2 (F=1388H (50.00Hz), V1=03E7H (99.9V), V2=03E9H(100.1V) is shown as Table4.9.Table 4-5 Read F, V1 and V2 Message of responseCRC16 hi CRC16 lo11H 03H 01H 30H 00H 03H 06H A8HAddrFunBytecountData1hiData1LoData 2hiData2loData3hiData3LoCRC16hiCRC16lo11H 03H 06H 13H 88H 03H E7H 03H E9H 7FH 04H64

2. Preset / Reset Multi-Register (Function Code 16)QueryFunction 16 allows the user to modify the contents of a Multi-Register. Any Register that exists within the Acuvim-L can have itscontents changed by this message. The example below is a request to anAcuvim-L number 17 to Preset Ep_imp = (17807783.3KWH), while its HexValue 0A9D4089H. Ep_imp data address is 0156H and 0157H.AddrFunData startreg hiData startreg loData #of reghiData #of regloByte Count11H 10H 01H 56H 00H 02H 04HAcuvim-LValue Hi Value Lo Value Hi Value lo CRC hi CRC Lo0AH 9DH 40H 89H 4DH B9HResponseTable 4-6 Preset KWH Query MessageThe normal response to a preset Multi-Register request includes theAcuvim-L address, function code, data start register, the number ofregisters, and error checking.AddrFunData startreg hiTable 4-7 Preset Multi-Registers Message of Response4.4 Data address table of Acuvim-LBasis measurementsData startreg loData #ofreg hiData #ofReg loCRC16hiCRC16lo11H 10H 01H 0CH 00H 02H A2H B4HThe data address of basis measurements includes primary dataaddress and secondary data address. Function code: 03 read.65

Acuvim-LAddress Parameter Range Data type Type of access0130H Frequency F 0~65535 word R0131H phase voltage V1 0~65535 word R0132H phase voltage V2 0~65535 word R0133H phase voltage V3 0~65535 word R0134H Line voltage V12 0~65535 word R0135H Line voltage V23 0~65535 word R0136H Line voltage V31 0~65535 word R0137H Phase(line)current I1 0~65535 word R0138H Phase(line)current I2 0~65535 word R0139H Phase(line)current I3 0~65535 word R013AH Neutral line current In 0~65535 word R013BH Phase power Pa -32768~32767 Integer R013CH Phase power Pb -32768~32767 Integer R013DH Phase power Pc -32768~32767 Integer R013EH System power Pcon -32768~32767 Integer R013FH Phase reactive power Qa -32768~32767 Integer R0140H Phase reactive power Qa -32768~32767 Integer R0141H Phase reactive power Qb -32768~32767 Integer R0142H System reactive power Qcon -32768~32767 Integer R0143H System Apparent power Scon 0~65535 word R0144H Phase power factor PFa -1000~1000 Integer R0145H Phase power factor PFb -1000~1000 Integer R0146H Phase power factor PFc -1000~1000 Integer R0147H System power factor PFcon -1000~1000 Integer R0148H Voltage unbalance factor U_unbl 0~1000 word R0149H Current unbalance factor I_unbl 0~1000 word R014AH Load nature RT(L/C/R) 76/67/82 word R014BH reserved --- --- ---014CH reserved --- --- ---66

014DH reserved --- --- ---014EH reserved --- --- ---014FH reserved --- --- ---0150H power demand P_DEMA -32768~32767 Integer R0151H reactive power demand Q_DEMA -32768~32767 Integer R0152HPhase A current demandIa_DEMA0~65535 word R0153HPhase B current demandIb_DEMA0~65535 word R0154HPhase C current demandIc_DEMA0~65535 word R0155H reserved --- --- ---Acuvim-LTable 4-8 data address of basic measurementsThe relationship between numerical value in register of Acuvim-L andthe real physical value is as following table. (Rx is numerical value inregister of Acuvim-L)Parameter Relationship UnitVoltage V1,V2,V3,V12,V23,V31 U=Rx × (PT1 / PT2) /10 Volt(V)Current I1,I2,I3, In I=Rx ×(CT1/CT2) /1000 Amp(A)Power Pa, Pb, Pc, Psum P=Rx × (PT1 / PT2) × (CT1/ CT2) Watt(W)Reactive power Qa, Qb, Qc, Qsum Q=Rx × (PT1 / PT2) × (CT1/ CT2) VarApparent power Ssum S=Rx × (PT1 / PT2) × (CT1/ CT2) VAPower factor PFa, PFb, PFc, PFsum PF=Rx / 1000NAFrequency F=Rx / 100 HzLoad nature(R/L/C) 76/67/82 NAVoltage or current unbalancefactor U_unbl, I_unblUnbl=(Rx/1000)×100%NATable 4-9 Conversion relationship of basic measurements67

Acuvim-LAddress Parameter Data type D a t a o faccess0600H~0601H Frequency F Float R0602H~0603H Phase voltage V1 Float R0604H~0605H Phase voltage V2 Float R0606H~0607H Phase voltage V3 Float R0608H~0609H Line voltage V12 Float R060AH~060BH Line voltage V23 Float R060CH~060DH Line voltage V31 Float R060EH~060FH Phase (line) current I1 Float R0610H~0611H Phase (line) current I2 Float R0612H~0613H Phase (line) current I3 Float R0614H~0615H Neutral line current In Float R0616H~0617H Phase power Pa Float R0618H~0619H Phase power Pb Float R061AH~061BH Phase power Pc Float R061CH~061DH System power Pcon Float R061EH~061FH Phase reactive power Qa Float R0620H~0621H Phase reactive power Qb Float R0622H~0623H Phase reactive power Qc Float R0624H~0625H System reactive power Qcon Float R0626H~0627H System apparent Scon Float R0628H~0629H Phase power factor PFa Float R062AH~062BH Phase power factor PFb Float R062CH~062DH Phase power factor PFc Float R062EH~062FH System power PFcon Float R0630H~0631H Voltage unbalance factor U_unbl Float R0632H~0633H Current unbalance factor I_unbl Float R0634H~0635H Reserved68

0636H~0637H Reserved0638H~0639H Reserved063AH~063BH Reserved063CH~063DH Reserved063EH~063FH Reserved0640H~0641H power demand P_DEMA Float R0642H~0643H reactive power demand Q_DEMA Float R0644H~0645H Phase A current demand Ia_DEMA Float R0646H~0647H Phase B current demand Ib_DEMA Float R0648H~0649H Phase C current demand Ic_DEMA Float R064AH~064BH ReservedTable 4-10 primary data address of basic measurementsAcuvim-LEnergy measurementsFunction code: 03 read; 16 Pre-setAddress Parameter Range Data typeType ofaccess0156H(High 16 bit) Import Energy Ep_imp0157H(Low 16 bit)0-99999999.9 DWord R/W0158H(High 16 bit)0159H(Low 16 bit) Export Energy Ep_exp 0-99999999.9 DWord R/W015AH(High 16 bit) Import reactive energy0-99999999.9015BH(Low 16 bit) Eq_impDWord R/W015CH(High 16 bit) Export reactive energy0-99999999.9015DH(Low 16 bit) Eq_impDWord R/WTable 4-11 Data address of energy measurements69

Acuvim-LThe relationship between numerical value in register of Acuvim-L andthe real physical value is as following table. (Rx is numerical value inregister of Acuvim-L).Parameter Relationship UnitEnergy Ep_imp, Ep_exp Ep=Rx/10 kWhReactive energy Eq_imp, Eq_exp Eq=Rx/10 kvarhTable 4-12 Conversion relationship of Energy dadaPower quality measurementsFunction code: 03 readAddress Parameter RangeTable 4-13 Data table of Power quality measurementsDatatypeType ofaccess0400HTotal harmonic distortion of V1 or V12THD_V10~10000 word R0401HTotal harmonic distortion of V2 or V23THD_V20~10000 word R0402HTotal harmonic distortion of V3 or V31THD_V30~10000 word R0403H Total harmonic distortion of I1 THD_ I1 0~10000 word R0404H Total harmonic distortion of I2 THD_ I2 0~10000 word R0405H Total harmonic distortion of I3 THD_ I3 0~10000 word RHarmonic content of V1 or V120406H~0413H(2nd ~15th )0~10000 word RHarmonic content of V2 or V230414H~0421H(2nd ~15th )0~10000 word RHarmonic content of V3 or V310422H~042FH(2nd ~15th )0~10000 word R0430H~043DH Harmonic content of I1(2nd ~15th ) 0~10000 word R043EH~044BH Harmonic content of I2(2nd ~15th ) 0~10000 word R044CH~0459H Harmonic content of I3(2nd ~15th ) 0~10000 word R70

The relationship between numerical value in register of Acuvim-L andthe real physical value is as following table. (Rx is numerical value inregister of Acuvim-L)Acuvim-LParameter Relationship UnitTHD THD=Rx/10000×100% NAHarmonic content THDn=Rx/10000×100% NATable 4-14 Conversion relationship of Power quality measurementsStatistics measurementsThe data address of Statistics measurements includes primary dataaddress and secondary data address. Function code: 03 readAddress Parameter Range Data typeType ofaccess0460H Max of V1 V1_max 0~65535 word R0461H Max of V2 V2_max 0~65535 word R0462H Max of V3 V3_max 0~65535 word R0463H Max of V12 V12_max 0~65535 word R0464H Max of V23 V23_max 0~65535 word R0465H Max of V31 V31_max 0~65535 word R0466H Max of I1 I1_max 0~65535 word R0467H Max of I2 I2_max 0~65535 word R0468H Max of I3 I3_max 0~65535 word R0469H Max of power demand PDmd_max -32768~32767 integer R046AH Max of reactive power demand -32768~32767 integer RQDmd_max046BH Max of current demand Ia 0~65535 word RIaDEMA_max046CH Max of current demand Ib 0~65535 word RIbDEMA_max046DH Max of current demand IcIcDEMA_max0~65535 word R71

Acuvim-L046EH reserved --- --- ---046FH reserved --- --- ---0470H Min of V1 V1_min 0~65535 word R0471H Min of V2 V2_min 0~65535 word R0472H Min of V3 V3_min 0~65535 word R0473H Min of V12 V12_min 0~65535 word R0474H Min of V23 V23_min 0~65535 word R0475H Min of V31 V31_min 0~65535 word R0476H Min of I1 I1_min 0~65535 word R0477H Min of I2 I2_min 0~65535 word R0478H Min of I3 I3_min 0~65535 word R0479H reserved --- --- ---047AH reserved --- --- ---047BH reserved --- --- ---047CH Run time (High 16 bit)047DH Run time (Low 16 bit)0~99999999.9 DWord RTable 4-15 Secondary data address of Statistics measurementsThe relationship between numerical value in register of Acuvim-L andthe real physical value is as following table. (Rx is numerical value inregister of Acuvim-L)The data formant of statistics measurements is the same as thatof Basis measurements except for run time of meter; the conversionrelationship refers to Table 4-8.The table below is the conversion relationship for run time.Parameter relationship UnitRun time of meter Run_Hour=Rx/10 HourTable 4-16 Conversion relationship of run time72

Address Parameter Data type Data ofaccess064CH~064DH Max of V1 V1_max Float R064EH~064FH Max of V2 V2_max Float R0650H~0651H Max of V3 V3_max Float0652H~0653H Max of V12 V12_max Float R0654H~0655H Max of V23 V23_max Float R0656H~0657H Max of V31 V31_max Float R0658H~0659H Max of I1 I1_max Float R065AH~065BH Max of I2 I2_max Float R065CH~065DH Max of I3 I3_max Float R065EH~065FH Max of power demand PDmd_max Float R0660H~0661H Max of reactive power demandFloatRQDmd_max0662H~0663H Max of current demand IaFloatRIaDEMA_max0664H~0665H Max of current demand IbFloatRIbDEMA_max0366H~0667H Max of current demand IcFloatRIcDEMA_max0368H~0669H Reserved036AH~066BH Reserved066CH~066DH Min of V1 V1_min Float R066EH~066FH Min of V2 V2_min Float R0670H~0671H Min of V3 V3_min Float R0672H~0673H Min of V12 V12_min Float R0674H~0675H Min of V23 V23_min Float R0676H~0677H Min of V31 V31_min Float R0678H~0679H Min of I1 I1_min Float R067AH~067BH Min of I2 I2_min Float R067CH~067DH Min of I3 I3_min Float R067EH~067FH ReservedAcuvim-L73

Acuvim-L0680H~0681H0682H~0683HReservedReservedParameter settingAddressTable 4-17 primary data address of Statistics measurementsFunction code: 03 read; 16 presetParameterDatatypeRangeTable 4-18 Data address of setting parameterType ofaccess0100H Access code word 0~9999 R/W0101H Communication address word 0~247 R/W0102H Baud rate word 1200-38400 R/W0103H Voltage input wiring type word 0:3Ln;1:2ln;2:2LL;3:3LL R/W0104H Current input wiring type word 0:3CT;1:1CT;2:2CT R/W0105H PT1(High 16 bit)0106H PT1(Low 16 bit)DWord 50.0~1000000.0 R/W0107H PT2 Word 50.0~400.0 R/W0108H CT1 Word 1~50000 R/W0109H CT2 Word 5 R/W010AH Definition of reactive power word0: Sinusoidal;1: NonsinusoidalR/W010BH “On” time of back light word 0~120 R/W010CH Time of Demand slid window word 1~30 R/W010DH Clear Max Word 0aH: clear R/W010EH Clear energy enable Word 0:disable;1:enable R/W010FH Clear energy Word0: do not clear;0aH: clearR/W0110H Clear run time Word 0aH: clear R/W74

Note:1. data type:Word: unsigned integer of 16 bit;Integer: signed integer of 16 bit;DWord: unsigned integer of 32 bit;Float: float data of 32 bit.2. type of accessR: read only, data read by using function code 03.R/W: read and write, data read by using function 03 and written byusing function code 16.It is forbidden to write data address which dose not possessesproperty to be written.3. Energy and run timeEnergy and run time data is represented in 32 bit. Both high 16bit and low 16 bit have successive address alone. The high 16 bitshould be multiplied by 65535 and plus low 16 bit data to get theenergy and run time data in master software. The unit is 0.1kWh,0.1kVarh and 0.1hour. The energy register can be cleared or preset viacommunication. The register of run time can be cleared and can notbe preset.Acuvim-L75

Acuvim-L76

AppendixAppendix A Technical data and specificationsAppendix B Ordering InformationAppendix C Revision History77

Acuvim-LAppendix A Technical data and SpecificationInput ratingsVoltage inputVoltage ratingFrequency rangeoverloadVoltage range through PTPT burdenMeasuring400 LN / 690 LL Vac RMS (3-phase),400 LN Vac RMS(single-phase)With 20% overage (3LN or 2LN wiring)Installation Category III, Pollution Degree 245~65Hz2 times(continuously);2500Vac per second (no recurrence)1000KV highest at primary side

AccuracyAcuvim-LParameterAccuracyVoltage 0.5%Current 0.5%Current demand 0.5%Power 1.0%Reactive power 1.0%Apparent power 1.0%Power demand 1.0%Reactive power demand 1.0%Power factor 1.0%Frequency 0.5%Energy 1.0%Reactive energy 1.0%Unbalance factor 1.0%Harmonic 2.0%Drift with temperature

Acuvim-LDigital outputDOOutput formMax voltageMax currentOptical isolationPhoto-MOS,Form A250Vac/300Vdc50mA2500 Vac RmsCommunication portTypeProtocolBaud rateRS485, 2 wire, half duplex, optical isolatedModbus-RTU1200~38400 bpsSuitable conditionDimensions(mm) 96×96×51 (cutting-out 92×92 or 4inch Round)Protection levelIP52 (front), IP30 (cover)Weight350gOperating Temp. range -25℃ ~ 70℃Storage temp. range -40℃ ~ 85℃Humidity0~95%, non condensationPower supply100~415Vac , 50/60Hz; 100~300VdcPower consumption 3W80

Appendix B Ordering InformationAcuvim-LAcuvim-□LA-----Acuvim-AL(Basic model)B-----Acuvim-BL(Basic model+2DO)C-----Acuvim-CL(Basic model +RS-485)Note: 1. 5A of the current input is the standard product. Please contactfactory if 1A current needed.2. The range of power supply:100~415Vac, 50/60Hz100~300VdcPlease contact factory if low DC voltage power supply needed.81

Acuvim-LAppendix C Revision HistoryRevision Date Description1.0 200709151.1 20070930Add primary data address table of basic measurementsdata and Statistics measurements data.82