Single-Phase Static Meter GEM - Elgama
Contents
1. Tariff number for energy 1 2 3 4 Daylight saving changes MM DD hh mm Digits after decimal point 0 1 2 3 Summer time 03 00 00 oven WD_MM DD Winter time 10 00 00 YY MM DD Relay output function TO T1 T2 T3 T4 Cumulative TO intervalai paroje hh mm hh mm Data displ le after TI TA K ata displaying in cycle after Tx TOI 00 00 00 00 102 00 00 00 00 LCD cycle Time Date LCD test Serial Nr T1 T2 Cumulative Power Holidays 8 th day in tariff table Month Day Month Day Month Day Month Day January April July October February May August November March June September December Tariff seasons and numbers of assigned week profiles Nr Date meee Nr Date vek Nr Date MER Nr Date Wek profile profile profile profile 1 01 01 1 4 00 00 0 7 00 00 0 10 00 00 0 2 00 00 0 5 00 00 0 8 00 00 0 11 00 00 0 3 00 00 0 6 00 00 0 9 00 00 0 12 00 00 0 Week profiles Nr Monday Tuesday Wednesday Thursday Friday Saturday Sunday Holiday 110 0 0 0 0 1 1 1 Day profiles No Tariff switch over 1 2 3 4 5 6 7 8 07 00 23 00 T2 00 00 TO 00 00 TO 00 00 TO 00 00 TO 00 00 TO 00 00 TO 1 00 00 T2 00 00 TO 00 00 TO 00 00 TO 00 00 TO2. H 25 CONNECTION DIAGRAM OF METER GEM CONNECTION TO NETWORK 25 PRIN dete died eae e 26 METER DIMENSIONS AND POSITIONING FIXING 5 2 26 ANNEX C cvsscoscticcsescscccascescccsaassecsessocnc sasssccssdsosscesossesssessosscesososesseasoascescaseccsessosccdsoassscsessosscascabaccsess 27 THE EXAMPLE OF PARAMETERIZATION DATA TABLE 27 SINGLE PHASE METER GEM USER MANUAL This User Handbook presents a description and exploitation instruction for single phase static meter GEM Please read this instruction prior to the use of the meter The manufacturer does not give any guaranty in case meters are damaged during the exploitation that contravenes with the instructions and requirements of work security stated in the handbook or meter pass The manufacturer is not responsible for the loss in case the meter is parameterized without accordance with the instructions and recommendations presented in the software description as well as with tariff order defined by the State It does not carry the responsibility for the unprofessional acts of responsible persons in case of full or partial loss of account data User Handbook presents the description of all possible characteristics functions and auxiliary outputs of electricity meter A concrete meter may not comply with all characteristics introduced in this Hand
3. 21 7 1 MEANS OF PHYSICAL PREVENTION cccccccccscsssssscecccccecessssssescccccessusussesesccssssseeusesseesceseeeeenenenss 21 7 2 MEANS OF SOFTWARE PREVENTION 6 nenne seeker ii eres esse ke sei eese sese nenas nana 21 7 72 IPasSwOFu teens ELA 21 252 2 sasha dde taa dei Lagu bau sedet 21 7 2 3 Block of communication via optical interface eee essen 21 22 d Other means Of D eVERIDHS o eee tactu Rede ocean eases 21 PREPARATION FOR WORK 22 BTN Se QU 22 8 2 PARAMETERIZATION ene 22 TECHNICAL SERVICE OF 23 23 9 2 PREVENTION AND ELIMINATION OF MALFUNCTIONS ccccccccccccsssssssscccccccessessssscsccesscessneasesees 23 9 2 I EX FIOFIBSPDOCIOR iid suas ee a ince eee as rv dass aces ed veu eel nt 23 9 2 2 Inspection of connection and parameterization 22 9 3 TRANSPORTATION AND STORAGE 8 4 40 000000000 0000 9 24 9 4 THE PROCEDURE RETURNING TO 0 00404000000100000 24 ANNEX C
4. 00 00 TO 00 00 TO 00 00 TO 27
5. in charge of their exploitation and short description of meter s malfunctioning Manufacturer ELGAMA ELEKTRONIKA Ltd Visoriy str 2 LT 08300 Vilnius Lithuania Tel 370 5 2375 000 Fax 370 5 2375020 E mail info elgamaz lit 24 SINGLE PHASE METER GEM USER MANUAL Annex Connection diagram of Meter GEM connection to network Figure A 1 presents the general scheme of GEM meter connection when the meter has all auxiliary outputs However a concrete variant may contain differences in regard with this figure Therefore the user must read about the meter connection in meter pass the scheme may also be presented on the meter cover and must follow these instructions Figure A 1 General GEM wiring diagram Table A 1 describes the designation of auxiliary contacts NOTE The scheme of concrete meter may contain differences in regard with the scheme introduced in Fig A 1 Precise meter connection scheme is presented in meter pass on the meter cover or on the cover of clamp block Designation of auxiliary outputs Pin No Contact designation 23 Current loop 24 Current loop 35 36 Relay output 40 SO output 41 SO output 25 Annex Meter dimensions and positioning of fixing holes 132 59 26 230 SINGLE PHASE METER GEM USER MANUAL The example of parameterization data table Meter parameters
6. 1mm diameter wire should be used in twofold manner Sealing wire is to be stretched tightly 14 SINGLE PHASE METER GEM USER MANUAL 5 Tariff module Tariff module of meter may be active in one tariff and multi tariff mode Up to four tariffs can be used when multi tariff mode is activated Programmed tariff module performes data distribution among the registers whereas tariff control is performed by internal microcontroller clock 5 1 Tariff profile GEM meter has a tariff module controlled by tariff profile which defines the order control and time of day week and year tariffs Flexible structure of the tariff module allows adapting almost every tariff program without additional modifications Tariff module consists of three separate programs 1 Day profile Day profile is a profile which activates selected tariff in selected time interval Up to eight time intervals can be set for each day profile and only one tariff must be assigned to each interval Each time interval is described by time of interval beginning Tariff module of GEM meter allows creating up to 15 day profiles 2 Week profile Week profile is a profile which activates profiles of a day according to sequence indicated during meter parameterization The same day profile is assigned for all off days Each week profile is described by eight numbers Each of these numbers show which day profile must be activated in a certain day Eighth number shows number of day prof
7. 8 ASCII symbols A system of prevention from password guess is implemented too If the meter registers more than four cases of trying to parameterize the meter by using the wrong password optical communication interface is blocked for 24 hours During this time the meter does not accept even the right password 7 2 2 Event register Event register is a memory part of a meter which stores data about events GEM meter registers the following events Power outages The total number as well as dates and time of 10 last outages Date and time of last parameterization Internal errors of meter Codes of damage is registered Influence by magnetic field The total number of influences total influence duration and date and time of last influence is registered Openings of meter cover The total number of openings total openings duration and date and time of last cover close up is registered this possibility is ordered additionally 7 2 3 Parameterization lock Meter provides lock feature for optical communication interface This feature prevents meter from unauthorized meter parameterization Feature is disabled by pressing control button in position B seal must be eliminated prior When feature is disabling a communication indicator is signaling on LCD for a while Parameterization unlock lasts for 1 hour 7 2 4 Other means of prevention Meters calculate only progressive energy independently from the direction of current circuit connect
8. ETER GEM USER MANUAL Table 6 3 Data read via communication port and its OBIS codes pao F F Fatal error if XX 80 Meter s status string Total energy in register T2 Request parameter Additional service information Number of case openings total duration of openings date and time of last case close up Internal errors 10 last network disconnections connections date and time Duration and number of strong magnetic field influences YXXXXXXXXX Relay status 1 0 turned on turned out XYXXXXXXXX Summer time 0 1 2 absent summertime wintertime XXYXXXXXXX active tariff 0 1 4 XXXYXXXXXX active tariff season Y 1 Bh XXXXYXXXXX active week profile Y 1 Ah XXXXXYXXXX active day profile Y 0 Eh XXXXXXYXXX battery status 0 1 good change XXXXXXXY XX internal errors 0 1 absent present XXXXXXXXYX current direction 0 1 normal reverse XXXXXXXXXY load indication 0 1 absent present 6 4 Indication of instantaneous power Indication of instantaneous power may be included into sequence of data scrolled or chosen by affecting optic sensor with light pulses This window shows the average power integrated during the last 8 seconds Power is calculated and indicated by step of 0 009 kW 19 6 5 Indication of failures If a fatal error occurs which leads to the corruption of account data an inscription Er appears on the right side of LCD When lithium battery voltage falls down t
9. Single Phase Static Meter GEM User Handbook Version 3 1 ELGAMA ELGAMA ELEKTRONIKA Lietuva 2004 Erona ELGAMA ELEKTRONIKA Ltd Single Phase Static Meter GEM User Handbook ELGAMA ELEKTRONIKA Ltd Visoriu str 2 08300 Vilnius Lithuania Tel 370 2 375000 Fax 4370 2 375020 E mail info elgama lt SINGLE PHASE METER GEM USER MANUAL CONTENTS 5 8 s MODIFICATIONS T E 8 TECHNICAL essasi eisso 9 CONSTRUCTION 10 41 CASE 10 4 2 ELECTRONIC AND OPERATION PRINCIPLE cccsccccccccccesssssesccccceccseesssescecccsssesessesesscesseseenenenss 11 4 2 1 Measurement 11 4 2 2 Microcontroller eub ie 11 d 2 3 9 EEPROM memory e DERE DELE DUE eT ace aA eS PEL UNA 11 2 224 Inermu lclockwsc ted Re om 11 4 2 3 Liguid crystal display ECD wo a ovest ee dative vie TIE RON E 12 4 3 COMMUNICATION INTERFACES ccccccccccccccssssscecccccecssseessescccccssessuuseeesccssseauussescsccesseseanensess 13 43 1 Optical IBIerfce
10. agnostics of internal malfunctioning Duration of data storage without power supply 1 0 or 2 0 IEC 62053 21 100V 120V 127V 220V 230V 10 60 A 10 100 A 50 or 60 0 4 From 25 C to 55 C 1 0 75W 0 05 2000 Programmable 1 4 For local data and meter parameterization For direct data reading IEC 62056 21 300 2400 baud Telemetric pulses Programmable or synchronized with expire time of tariff chosen reading Up to 9999 outages Total duration date time of last release Total duration date time of last close up Up to 9999 cases 20 years when T lt 25 ver 2 years when T 60 C Dimensions mm 230x132x59 Weight kg 0 95 Service period 30 years 4 Construction 4 1 Meter Case Meters case fixing holes and terminal block meet the requirements of standards IEC 62053 21 and DIN 43857 High mechanical resistance limpid window mould of ultraviolet stabilized polycarbonate protects meter s interior and its nameplate Meter s window is fixed to the background by two sealed screws Fig 4 1 presents meter s exterior and composition of control elements whereas Annex B introduces housing dimensions and composition of fixing holes SOLO I Optical test output Photo sensor Optical interface Sealable screws Fig 4 1 Meter s exterior LCD optical interface photo sensor and two functional pushbutton for data scrolling are located in the front of the meter Chapter 6 de
11. arking of modifications Table 2 1 Marking of meter GEM modifications GEM X X X X X X Measurement elements One element two wire connection 1 Reference voltage V 110 120 127 Special request 220 230 3 Reference maximal current A Direct connection base maximum current 10 100 4 Direct connection base maximum current 10 60 5 Reference frequency Hz 50 HZ 60 Hz 1 Internal clock Meter has not internal clock for tariff switching Meter has internal clock for tariff switching 1 Auxiliary outputs Electronic pulse output Electronic pulse output current loop interface gt Electronic pulse output current loop interface relay 3 Technical characteristics SINGLE PHASE METER GEM USER MANUAL Table 3 1 The main technical characteristics of meter Accuracy class Rated voltage Inom Basic maximum current Rated frequency Hz Sensitivity threshold Ino Range of operational temperatures Power consumption V In voltage circuit In current circuit Meter s constant imp kWh Number of tariffs Communication interfaces optical interface electrical interface data transmission protocol speed of data transmission 50 pulse output 62053 31 Relay output Additional functions registration of power outages Influences by strong magnetic field Uncloses of meter cover Di
12. book however meter pass defines a precise meter configuration possibilities and auxiliary outputs as well as a concrete connection scheme The manufacturer has a right to change the information presented in this Handbook without the forehand warning In addition any copying transmission and publication of full or partial meter documentation is forbidden without a written ELGAMA ELEKTRONIKA permission 1 Designation The electronic multi tariff meter of direct connection is designated for accounting of active energy consumption in single phase alternate current networks It may also be used in automated meter reading systems for transmission of measured and calculated data into dispatching units 2 Modifications Modifications of the meter GEM differ in accuracy class rated voltage maximum current possibility to operate in one or multi tariff mode number of additional outputs GEM meters have the same case are equipped with optical interface and electronic pulse output All GEM type meters measure active energy consumption display instantaneous power independently from current flow direction and indicate reverse current circuit connection Four tariff GEM meters register cumulative energy Cumulative energy is total energy of all prior account periods months in other words energy registered at the end of a month Multi tariff meters have an internal clock for tariff module control Table 2 1 presents table of m
13. e identification indexes made of two or three numerals separated by dots Information presented in windows is identified with the help of column of indexes given in Table 6 2 Windows of the second column marked by Indexes 7 and 8 in Fig 6 1 indicate the dates of daylight saving changes 6 2 Data scrolling LCD indicator turns into data scrolling mode if photo sensor is not affected by light impulses for a minute The first column of Fig 3 presents sequence of maximal length parameters in scrolling mode Only parameters chosen during meter parameterization are shown Every parameter in the cycle is shown for 8 seconds When network voltage is disconnected only the influence of long light signal pointed to photo sensor may display the data In this case total energies of each tariff are being displayed for three times repeatedly and then the indicator becomes inactive Table 6 2 Index meanings stated in LCD indicator Tariff season description Format MM DD WP MM DD date of season beginning WP profile of week activated during tariff season validity 4 0 4 A Description of week profile Each day profile is described by two screens first 4 X YYYY which corresponds to the days of Mon Thu second 4 YYYY which refer to the days of Fri Sun and holiday Description of day profile 5 X 0 5 X 7 beginnings of new intervals 5 X 8 and 5 X 9 shows tariffs which are active during certain time interval One tariff is assigned t
14. ery switches to energy saving mode In this case only internal meter s clock uses the energy When network voltage is turned on power of lithium battery is not used A lithium battery in normal environmental conditions can support microcontroller s energy saving mode for not less than 10 years with network voltage off and temperature range from 25 to 55 C 4 6 Control button Meter has bifunctional control button see Fig 4 3 mounted on the front meter part In position A command button is used to display specific information in LCD indicator The button provides the following commands e short signal push and hold button for lt 0 5s e long signal push and hold button for gt 25 Control button and photo sensor provide identical signals For detailed information about data display in LCD and readout sequences see Chapter 6 The position B of the control button is used for communication unblock Not sealable Sealable position position Fig 4 3 Mechanical control button Change of button function In order to change button function it is recommended to use a screwdriver In order to unlock the communication via optical interface turn the button 90 according to the clock hand the seal is to be eliminated prior to unlock Read more about communication lock function in Chapter 7 2 3 Button sealing Button sealing may be performed only in position A see Fig 4 3A In addition diameter of sealing wire is to be 2 mm
15. eters remaining unchanged as long as meter is in action Customer parameterization supposes entering the constants adopting meter to the requirements of energy supplier Those constants refer to number of tariff time zones the first tariff time zone validity limits number of digits after point relay output parameters current date and time parameters displayed in scrolling mode These parameters are transmitted using ELGAMA ELEKTRONIKA Ltd software Gempard from PC via optical head OKK Annex C presents example of manufactory parameterization In the process of parameterization internal meter s clock is set automatically the date and time of personal computer are entered into a meter and therefore it is important to set exact time in computer before this operation Users Guide and the Help of windows of the software present the instructions on meter s parameterization and work with the software 22 SINGLE PHASE METER GEM USER MANUAL 9 Technical service of meter 9 1 Safety rules 1 The safety rules of electric equipment maintenance should be followed while installing and using a meter 2 Installing uninstalling parameterization and verification can be performed only by authorized organizations which have technicians with necessary qualifications Meter assembling works can be fulfilled only by persons who have not lower than medium electric safety group 3 Meter s connection or disconnection f
16. ii asco tie 13 tle OCC ie os 13 A AUXILIAR Y OUTPUITS tette Pere oce 13 4 4 1 Optical test output red EBD 13 44 2 Electrical Test Output SQ a u enit n ere te 13 13 Acs POWERISUPPEY 14 4 6 CONTROL BU LION cei sete eb teh S M i ELE 14 MODULE 15 5 DARIEE PROEILPE i eA HERREN RARE ASA SUN 15 5 2 HOLIDAY CALENDAR Eee ebore iie eode t 15 DATA SCROLL POSSIBILITIES eee ceca esee eese esee 16 6 1 MANUAL DATA SCROLLING 16 6 2 DATA SCROELINGA Pete ee eat 17 6 3 TOTAL AND CUMULATIVE ENERGY INDICATION 00000 erstes eee nnns 17 6 4 INDICATION OF INSTANTANEOUS POWER 19 6 5 INDICATION OF 5 20 6 6 DATA READING VIA CONNECTION 58 20 PREVENTION OF METER
17. ile which is activated during holidays Up to 10 week profiles can be set in GEM meter 3 Season profile When a new season of tariffs begins a specified week profile is activated The profile describes up to 12 tariff seasons Tariff meter module is able to control one season profile Season profile indicates season activation date month and day and week profile assigned to the season 5 2 Holiday calendar Tariff module has register for fixed holidays Each holiday entered in this register is described by day profile which is in position 8 in active week profile Days are entered into the register and deleted from it during the parameterization of meter I5 6 Data scroll possibilities Meter GEM has the following possibilities to display data on the LCD To scroll data and parameterization constants manually To scroll data automatically 6 1 Manual data scrolling There are two ways to control data output on LCD manually With control button position A e By affecting photo sensor with light signals There are two commands user can generate with both control button or photo sensor Short 0 5s signal indicator can display new data by light signals or by short mechanical button push Long gt 2s signal indicator can display detailed review of meter parameter by light signals or by mechanical button push Manual data scroll mode is activated by long signal LCD windows block diagram and thei
18. ion However in the case of reverse connection LCD shows a warning signal load indicator starts to blink 21 8 Preparation work 8 1 Adjusting Meter adjusting is made during its manufacture process and if necessary after its repair In the process of adjusting current phase and null signal shifts are compensated current and voltage transmission coefficients are assigned In this way a required meter precision is achieved Adjusting coefficients are entered and recorded via optical interface from personal computer into EEPROM This function can be completed only by opening the sealed meter s window Adjusting requires special software standards of alternating current and alternating voltage and therefore only manufacturer or its authorized representative can perform adjusting 8 2 Parameterization During parameterization parameters are set in the meter memory via optical communication interface Prior to meter parameterization communication block is to be disconnected Configuration constants are entered into EEPROM via optical interface during meter s parameterization There can be two groups of parameters entered e Manufacturer parameterization e Customer parameterization Manufacturer parameterization is possible only after opening meter s window by special software This parameterization enables to enter such data as serial number code of modifications constant duration of output pulses etc i e param
19. o critical limit a flashing symbol appears the right side of LCD Information on network disturbances influences by strong magnetic field and case openings are not shown on LCD though communication interfaces may determine them 6 6 Data reading via connection interfaces Meter consumer may use ELGAMA ELEKTRONIKA software Gempard or Gemdat for data reading via optical interface its processing and graphical image Two wire electric interface is used for remote data reading Electric communication interfaces enable data transmission via physical two wire lines in local network In order to transmit data in large distances GSM inter modem or AD interface User s manual of each software describes data reading procedure Table 4 presents the data viewed via interfaces and its OBIS codes 20 SINGLE PHASE METER GEM USER MANUAL 7 Prevention of meter data Meter and its software possess a prevention function against illegal data elimination constant date and time of clock change 7 1 Means of physical prevention Meter covers are sealed with screws in order to prevent covers from opening Both a seal of manufacturer and a seal of Metrology center are used In addition organization seal which implements a meter is put on the clamp block screw 7 2 Means of software prevention 7 2 Password Password can protect meter parameters from illegal actions Password cannot be longer than the sequence of
20. o one interval X number of day profile Description of holidays Format 6 X YY where X number of a month YY quantity of holidays in a certain month Description of holidays Format 6 ZZ where X number of a month Y running number of holiday a month ZZ day in a month which is described as a holiday 6 3 Total and cumulative energy indication Four tariff GEM meter registers total energy in each tariff zone total energy in all tariff zones and cumulative energy in each tariff zone by the end of each month These data can be displayed on LCD LCD displays the value which is chosen during the parameterization of the meter LCD shows the value after total energies of each tariff When LCD displays total energy of all tariffs indicator of data tariff shows 0 whereas blinking sign of displaying data tariff zone is showed when LCD displays cumulative energies 17 LCD test anna BHHHHHHB YY vy Y Y Serial number 5 E 5591 Y LN cr Total energy or cumulative ener Wh Fr E ym 6 6 En D LILILILILILI Summer time Vv y MMDD hh 6 1 1 6 1 1 7 nnnnnn P ZLILELILLLILI 8 Winter time MMDD hh UU 6 1 End 6 C End H nnnnnrm P Li ZLILLLI LELILI Y Y Fig 6 1 Scheme of data review 18 SINGLE PHASE M
21. r search scheme is given in Fig 6 1 In this scheme continuous pointer indicates short signal and dotted pointer indicates long light signal The first column of Fig 6 1 shows windows of the main LCD menu scrolling sequence can be formed of them during meter parameterization The picture explains designation of windows The second column of Fig 6 1 depicts the main widows of meter s programmed constants The windows of this column differ from other columns in having identification indexes 1 8 separated by mark P on the left side of parameters value field Meter s configuration set during the session of parameterization is encoded in the window marked by Index 1 Table 6 1 illustrates the designation of every sign whereas Table 6 2 gives possible meanings of the signs Table 6 1 Explanation of meter configuration code Code Sign designation Configuration Format of date 0 Year month day MM DD Weekday month day WD MM DD Number of tariffs Number defined Digits after point 0 Only whole numbers Po 3 Defined number of numerals time intervals programmed for 24 hours Function of relay contacts ERE cle 1 4 Synchronized with tariff defined Windows marked by Indexes 1 3 6 give accesses to the windows of lower level menu and their reading scheme is shown in the 3 column of Fig 3 the windows of the 34 column on the left 16 SINGLE PHASE METER GEM USER MANUAL side of the field hav
22. rom network should be done when voltage in the network is turned off A protection from accidental network voltage connection must be established 4 No accessories can be hung on a meter it is forbidden to hit or strike meter s case 9 2 Prevention and elimination of malfunctions If suspected that meter works improperly the following actions should be performed 9 2 1 Exterior inspection Before starting voltage supply to the meter make sure its case has no mechanical damages there are no signs of overheating all wires are properly connected NOTES Do not plug a meter into network if it is mechanically damaged This can cause staff injuries and destroy meter as well as other equipment Before switching on network voltage it is necessary to check if jumper closes both little bolts in terminal block above lead in clamps 9 2 2 Inspection of connection and parameterization constants After plugging a meter into electric network check whether date and time are correct whether meter shows right energy direction valid tariff time zone calendar and tariff seasons 1 If meter shows wrong date and time contact a representative from the organization in charge of the meter installation 2 If LCD indicator shows a warning note Er the meter should be uninstalled and passed for repair works 3 If energy direction is wrong check if inputs are connected properly to terminal block 4 If meter calendar season season time name or
23. s of active Load indicator tariff 8 symbols are used for the display of measurement units Fig 4 2 Designation of LCD indicator s segments After turning network voltage off microcontroller operates in energy saving mode and LCD is switched off However if photo sensor is affected by light pulses or button is pushed microcontroller turns on the LCD scrolls cycle data 3 times and turns off LCD SINGLE PHASE METER GEM USER MANUAL 4 3 Communication interfaces GEM meters have optical communication interface GEM XXX XX 1 and 2 meters have as well electric communication interface 20mA current loop 4 3 1 Optical interface Optical interface is used for data downloading into mobile PC and for meter parameterization via OKK optical head Data transmitting protocol via this interface complies with the requirements of IEC 62056 21 Standard This interface is also used for meter s calibration in the factory GEM meters maintain the interface block function which is active via optical communication interface This function protects unauthorized meter parameterization Read more about this function in Chapter 7 2 3 4 3 2 Electrical interface Electrical interface is designated for automatic data transmission to outside equipment GEM type meters have two wired 20 mA current loop type electrical interface fed by outside device The maximum supply voltage of open circuit is lt 30V maximum loop curren
24. scribes data scrolling commands Nameplate of the meter contains information anticipated by IEC 62053 21 standard and list of cyclically scrolling data displayed in LED 10 SINGLE PHASE METER GEM USER MANUAL 4 2 Electronic and operation principle Elements of meter s electronic scheme are under the nameplate and most of them are assembled on a single printed circuit board using surface mounted technology The main meter components and principle of meter operation are described below 4 2 1 Measurement module Current and voltage are measured by current transformer and resistive voltage divider correspondingly Microcontroller conducts conversion of analogue signals into digital data processing display and transmission to external information collection systems 4 2 2 Microcontroller Analogue signals of current and voltage are converted into code signals by microcontroller s analog code converter Microcontroller multiplies instantaneous current and voltage values and every second calculates average power Consumed energy kWh is calculated by integration of power values sequence P t The values calculated in accordance with the valid tariff program are registered in corresponding energy registers of energetically independent meter memory ROM type memory of the controller saves the software of the meter Microcontroller of the meter controls LCD indicator communication interfaces optical and electronic test outputs and relay o
25. stment for daylight saving changes MM00 00 Clock is adjusted for summer time on the last Sunday of a month MM at 2 a m by winding the clock 1 hour forward Clock is adjusted for standard time on the last Sunday of a certain month MM at 3 a m by winding the clock 1 hour backward MM00 hh Clock is adjusted for summer time on the last Sunday of a specified month on the time specified by winding the clock 1 hour forward Clock is adjusted for standard time on the last Sunday of a specified month on the time specified by winding the clock 1 hour backward MMDD hh Clock is adjusted for summer time on the time and date specified by winding the clock 1 hour forward Clock is adjusted for standard time on the time and date specified by winding the clock 1 hour backward 4 2 5 Liquid crystal display LCD GEM meter is equipped with digital Liquid crystal indicator which has 84 controllable segments Liquid crystal indicator displays all data and parameterization constants accumulated in a meter Fig 4 2 presents the composition of controlled segments in the indicator and their designation and Section 6 describes detailed schemes for information presentation on LCD indicator Indicator feeding scheme guarantees its operation in temperature range from 20 C to 65 Value Communication indicator Meter error B Measurement units E W Tariff of H H A Indication yy vy Y Indicator
26. t is lt 30 mA In case of reverse connection interface is not active it is save from damage IEC 62056 21 protocol is used for interface via current loop 4 4 Auxiliary Outputs 4 4 Optical test output red LED There is a red light diode in the meter s nameplate which produces light impulses with frequency proportional to measured consumed energy Only the producer is able to program meter s constant 2000 imp kWh and impulse duration 30 ms 4 4 2 Electrical Test Output SO Meter has electrical test output for transmission of electric pulses carrying information about energy consumption There is an n p n transistor with an open collector in test output which is galvanically separated from meter s circuit by optocopler Constant of impulses and their duration is the same as for optical test output Maximum voltage applied to test output is 24 V maximal current is 100 mA 4 4 3 Relay output Relay output can switch current of 120 mA and voltage up to 250 V Relay control can be programmed in two ways Normally open contacts are connected for indicated valid tariff time zone Normally open contacts are connected for two time intervals programmed discreteness of determination 15 min 13 4 5 Power supply GEM meters contain pulse power supply It guarantees the functioning of meter when the voltage is in the range of 100 280 V When voltage is disconnected meter s microcontroller supplied by lithium batt
27. utput provides tariff module handling registers signals of magnetic field sensor and counts events of cover opening 4 2 3 EEPROM memory Meter s constants power calibration coefficients starting threshold and other constants entered at meter s parameterization by manufacturer are saved in EEPROM type memory EEPROM electrically erasable programmable ROM EEPROM memory also saves accumulated data commercial data network events and internal failures and meter parameters 4 2 4 Internal clock Meter microcontroller has internal real time clock which counts years months week days hours minutes and seconds Clock data is used for tariff mode operation Internal clock stabilized by quartz resonator in multi tariff meters is in charge of time zones switching Clock is stabilized by quartz crystal resonator Software clock error compensation ensures clock error which does not exceed 60 s per year In case of power outages clock uses Lithium battery energy Clock can be automatically adjusted for daylight saving changes Variants of clock adjustment for daylight saving changes are indicated during the parameterization of meter Table 4 1 presents all possible adjustment variants Note data formats of daylight saving changes are to be the same for summertime and wintertime 11 Table 4 1 Variants of clock adjustment for daylight saving changes Date format 3 MMDD hh Date and time of clock adjustment 0000 00 No adju
28. valid tariff time zone does not correspond to real situation meter s parameterization data has to be checked and errors has to be corrected by repeated meter s parameterization 23 9 3 Transportation and storage rules Prior to the usage meter is to be kept in a closed room where the temperature ranges from 5 C to 40 C and average area humidity is up to 80 when temperature being 25 C in a transportation packing The room must be without harmful gas or steam Packed meters are put in the shelves not more than five rows on each other and not nearer than 0 5 m from heating devices Unpacked meters can be kept only in repair workshop Meter can be loaded not more than five rows on each other and separators must be used The temperature must range from 10 C to 35 C average area humidity must not exceed 80 when temperature being 25 C During wintertime meters must be kept in a heated room for 6 hours or more Meters are to be transported only in closed vehicles carriage container hold Shake acceleration is to be up to 30m s 80 120 strikes per minute The temperature must range from 50 C to 50 C average area humidity must not exceed 98 when temperature being 35 C 9 4 The procedure of returning to manufacturer In case malfunctions cannot be eliminated on the spot the meter should be returned to the manufacturer for repair or replacement Meters on their return to enterprise must have their Pass with notices of organization
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