PROGRAMMABLE DIGITAL PANEL METER N12P
Contents
1. 08s 5 r ese painseaw jo BuuiolluoW 13 The pressure of the jJ key causes the display of minimal value of the currently displayed value whereas the pressure of the causes the display of the maximal value of the currently displayed value The exit from the menu is proceeded by means of the key The appearance of the following symbols on the digital displays means N Bl Incorrect introducing of the security code AN Exceeding of the upper measuring range Exceeding of the lower measuring range or lack of signal 6 PROGRAMMING The key pressure and its holding down during ca seconds causes the display of the security code symbol SEC alternately with the 0 value set up by the manufacturer The writing of the correct code causes the entry into the programming matrix The transition matrix into the programming mode is shown on the fig 5 We choose the level by means of the key whereas the entry and moving through parameters of the chosen level is carried out by means of the J and keys Parameter symbols are displayed alternately with their actual values In order to change the value one must use the key resign of the parameter change one must press the 9 key To exit from the chosen level one must select the symbol and press the key 14 In order to exit from2. ZA ZH LA Jamod iu 10 1uou s nedo suoinoexe juo sisixe Z UO pul pepnjoul si 2 PnpiAIpu eu uo Sisixe Jejunoo ejunoo jejunoo KBjeuo SJojouleJed jo jo Bumes 153 pjepuejs Bum s Yun ejdsig piowsseq jo buyum aaas 6 Su35 bu35 du39 39 238 185 138 usuen pneq jndino jndjno yndjno 104 T9 jO puly uoisiusuei Jedd j Jamo7 jo pury 1ndui jo yndjno v pnyq HUY d MO z Es poddns _ ed Ayquenb jeubis Jedd jo z t ZAP Zid ZV d env yoddns Kejap ed plous Ju Ayquenb UT Jeubis jo puly z LPT LAIP bdA wans ones ones eBuej Ayquenb eaw jo j uuojsuen padejdsip Jeaur Jaquny quauing eDejoA juaung
3. 0 5 u l Measurement of the a c power factor cosa The power factor is calculated according the formula 5 Where P active power S apparent power Basic error in reference conditions 0 1 i v 1 u l 49 Measurement of the ratio of the reactive power to the active power tgo The ratio of the reactive power to the active power is calculated according the formula Q tgo gp 5 Where Q reactive power P active power Basic error in reference conditions 0 1 i v 1 u l Measurement of the a c voltage frequency The frequency of the voltage is calculated according the formula 1 Where T period of a c voltage f frequency current value of one period Basic error in reference conditions 0 1 i v 0 1 u l Calculation of the 10 seconds frequency Er Where n averaging time in seconds fi frequency value in the period of the measured signal fsr mean value changing in the time of the frequency value Basic error 0 1 i v 0 196 u l 50 Preheating time Weight Repetition time of the measurement 15 minutes 200 g programmable min 500 ms 9 BEFORE A FAILURE WILL BE DECLARED A SYMPTOMS PROCEDURE 1 The meter does not operate Check the connection of the feeder cable 2 Only the diodes are lighting Number of measurements 0 has been introduced The meter operates in the SLEEP mode the display
4. authorized service workshop 12 MAINTENANCE AND GUARANTEE The N12P meter does not require any periodical maintenance In case of some incorrect unit operations 1 In the period of 12 months from the date of purchase One should take the meter down from the installation and return to the Manufacturer s Quality Control Dept If the unit has been used in compliance with the instructions the manufacturer guarantees to repair it free of charge 2 After the guarantee period One should turn over the meter to repair in a certified service workshop The disassembling of the housing causes the cancellation of the granted guarantee Spare parts are available for the period of ten years from the date of purchase We reserves the right to make changes in design and specifi cations of any products as engineering advances or necessity requires 57 SALES PROGRAMME MEASUREMENT DIGITAL PANEL METERS CONTROL BARGRAPH INDICATORS RECORDING MEASURING TRANSDUCERS ANALOGUE PANEL METERS DIN INSTRUMENTS DIGITAL CLAMP ON METERS PROCESS and HOUSEHOLD CONTROLLERS CHART and SCREEN RECORDERS POWER CONTROL UNITS and FREQUENCY INVERTERS AUTOMOTIVE DASHBOARD INDICATORS STATIONARY and PORTABLE CALIBRATORS MEASUREMENT ACCESSORIES SHUNTS SENSORS TRANSFOR MERS MEASURING SYSTEMS ENERGY HEAT CONTROL MEASURE MENT CUSTOM MADE PRODUCTS WE ALSO OFFER OUR SERVICES IN THE PRODUCTION OF ALUMINIUM
5. eBejoA Joed pul any na uve nuvH dA SOd 16 Table 1 Parameter inti symbol Description Range of changes tYP Selection of the measured value U rms voltage l rms current FrEq frequency P active power q reactive power S apparent power PF powerfactor tF ratio of reactive power to active power FI angle phase EnP active energy reactive energy EnS apparentenergy P Au 15 minutes mean active power Au 10 minutes mean voltage F_ Au 10 seconds mean frequency Hour current RanU Selection of voltage range 100U 100 V range 400U 400 V range Ranl Selection of current range 1 range 5A 5 A range trU Selection of voltage ratio In 4 digit execution 0 9999 In 5 digit execution 0 99999 trl Selection of current ratio In 4 digit execution 0 9999 In 5 digit execution 0 99999 Aur Selection of the averaging mode Cnt Arythmetic mean Cnt Stepping window 17 table 1 continuation UAL Number ot averaged measurements In 4 digit execution 0 9999 The time of a single measurement is i equal 500 ms In 5 digit execution 0 99999 The result on the display is refreshed The writing of the 0 causes the every UAL x 500 ms measurement switching off and the blanking of displays Ind Switching off or on of the user s
6. mean active power 13 10 minutes mean voltage 14 10 seconds mean frequency 15 current time 7204 7602 RanU w t 0 1 Voltage input range Value 0 100 V range 1 400 V range 7206 7603 w t 0 1 Current input range Value 0 1 range 1 5 range 7208 7604 trU w r 0 99999 Voltage ratio Value 0 9999 4 digit meters 0 99999 5 digit meters 7210 7605 trl w t 0 99999 Current ratio Value 0 9999 4 digit meters 0 99999 5 digit meters Table 5 continuation 7212 7606 Aur 0 1 Kind of averaging Value 0 Arithmetical mean 1 Stepping window 7214 7607 UAL w t 0 99999 Number of measurements Value 0 9999 4 digit meters 0 99999 5 digit meters 7216 7608 Con No occurs 7218 7609 SCAL occurs 7220 7610 ConS No occurs 7222 7611 E In No occurs 7224 7612 Auto No occurs 7226 7613 dP wir 0 4 Decimal point Value 0 3 4 digit meters 0 4 5 digit meters 7228 7614 Cnt No occurs 7230 7615 Ind wir 0 1 Indivigual characteristic Value 0 Characteristic switched off 1 Characteristic switched on 7232 7616 H1 1999 19999 Parameter of the individual characteristic Value 1999 9999 4 digit meters 19999 99999 5 digit meters Number of Kind of input decimal places automatically Rms voltage set up automatically Rms curren
7. 100 V Supply lub 400 V S4 s 8 SV VV L1 AJ z P N 4 Fig 2 Connection way of the N12P meter 5 OPERATION After switching the meter on its type and next the program version are displayed After ca 10 sec the meter transits automatically into the measuring mode and the input signal value is displayed The meter blanks automatically insignificant zeros Values of the binary point and the multiplier in the measurement of voltage current and power are automatically set up taking into consideration assigned ratios The exceeding of the alarm threshold is signalled by means of alarm diodes 1 and 2 The basic unit of the measured value is automatically highlighted by the meter Unit a 1 1 EEEEE wn Cancel key C C2 diodes Key to Key to Acceptance decrease increase key the value the value 8888 8 Cx Key to Key to Acceptance decrease increase key the value the value Fig 3 Description of the meter faceplate a 5 digit execution b 4 digit execution 1 No exists in the 4 digit 20 mm execution 10 Key functions acceptance key entry into the programming mode hold down during ca 3 seconds moving through the menu choice of the level moving through the monitoring menu of measured values selection of the next value entry into the change mode of the parameter value acceptance of the changed parameter
8. ALLOY PRESSURE CASTINGS PRESSURE CASTING DIES AND INJECTION MOULDS PRECISION ENGINEERING AND THERMOPLASTICS PARTS QUALITY PROCEDURES According ISO 9001 international requirements LUMEL Lubuskie Zaktady Aparat w Elektrycznych LUMEL S A ul Sulechowska 1 65 022 Zielona G ra Poland Tel 48 68 3295 100 exchange Fax 48 68 3295 101 http www lumel com pl Export Department Tel 48 68 3295 302 or 304 Fax 48 68 3254 091 gpail export lumel com pl March 2002
9. N12H 0x62 N12T 0x63 N120 0x64 N12P 0x65 N12B Device state OxFF Field depending on the device type XXXXXX 28 Device name Number of displays Nr of the program ming version Control total Example transmitted as ASCII characters and defines the meter type S 0x53 53 XX XXX H 0x48 48 X X X XX T 0x54 54 X X X XX O 0x4F 4F X X X X X P 0x50 50 X X X X X B 0x42 42 X X X X X Field depending on the number of meter displays 0x04 4 digit meters X 04 X X X X 0x05 5 digit meters X 05 X X X X programming version implemented in the meter X X _ 4 byte variable of float type 2 bytes in the case of work in the RTU mode 1 byte in the case of work in the ASCII code 1 byte in case of work in the ASCII code Work in the RTU mode e g trYb r8n2 value 0x02 in the case of reading writing through the interface N12P meter Execution with a 4 digit display Nr of the programming version 1 00 Device address set on Adr 0x01 For this type of meter the frame will have the following shape Device Function Number Device Device Field depending Control address of bytes identifier state on the device type total CRC r s r 29 7 4 Register map of N12 meter Register map of the N12 series meter Table 4 Address range Value type Description 7000 7200 float 32 bits The value is placed in two succesive 16 bit registers
10. ON Characteristic switched on individual linear characteristic OFF Characteristic switched off H1 Y1 Parameters of the individual H2 Y2 characteristic the base of co In 4 digit execution ordinates of two points given by the 1999 9999 user the meter assigns coefficients of In 5 digit execution the individual characteristic a and b 19999 99999 Y aH b H1 and H2 measured value Y1 and Y2 expected value on the display DP Setting of the decimal point Setting possibilities in the 4 digit This setting acts when the individual execution characteristic is switched on 0000 When the characteristic is switched off 000 0 the decimal point is set automatically 00 00 0 000 In the 5 digit execution 00000 0000 0 000 00 0 0000 P A1 Kind of input quantity type at which the U rms voltage P A2 alarmi to react 1 rms current FrEq frequency P active power q reactive power 5 apparent power PF power factor cos 18 table 1 continuation tF ratio of reactive power to active power tgp FI angle phase EnP active energy Enq reactive energy EnS apparentenergy P Au 15 minutes mean active power U Au 10 minutes mean voltage F_ Au 10 seconds mean Frequency PrL1 PrL2 Alarm lower threshold In 4 digit execution 1999 9999 In 5 digit execution 19999 99999 tYP1 tYP2 Alarm type The fig 6 shows the graphical illustration of alarm typ
11. Registers include the same data as 32 bit registers from the 7500 area Registers are only for read out 7200 7400 float 32 bits The value is placed in two succesive 16 bit registers Registers include the same data as 32 bit registers from the 7600 area Registers can be read out and written in 7500 7600 float 32 bits The value is placed in a 32 bit register Registers are only for read out 7600 7700 float 32 bits The value is placed in a 32 bit register Registers can be read out and written in 7 5 REGISTERS FOR WRITING AND READ OUT N12P meters Table 5 writing w Symbol read out r Range Description The value is placed in 32 bit clude the same data as 32 bit regi registers The value is placed in two succes sive 16 bit registers Registers in ster from the 7600 area e e A e e e Identifier r E Device identifier Value 60 xx Identifier 04 4 digits execution Xx 05 5 digits execution 30 Table 5 continuation 7202 7601 tYP w t 0 15 Input type Value 0 Rms voltage 1 Rms current 2 Frequency 3 Active power 4 Reactive power 5 Apparent power 6 Power factor 7 Ratio of reactive power to active power 8 Phase angle 9 Active energy 10 Reactive energy 11 Apparent energy 12 15 minutes
12. Y2 d P parameter symbols are not displayed in the programming mode In case of switched individual characteristic off mentioned symbols are omitted 10 Despite of the alarm threshold exceeding neither the alarm relay nor the signalling diode is Switched on Check the introduced delay of the alarm operations into the meter If need be correct the dLY parameter 11 Despite of the relay switching off the alarm diode does not go out Check if the alarm signalling support is not switched on LEd parameter off In case of need Switch it off 12 When the parameter of the alarm signalling support is switched on lack of possibility to erase the signalling diode by means of the key combination Fig 4 The alarm still lasts The erased diode is immediately re lighted 13 Despite the fact that the alarm still remains the signalling diod does not light up Check if a delay of the alarm operation has not been introduced dLY parameter 14 Instead to display the measurement result the meter displays the parameter symbol alternately with its value despite we were not entered into the programming mode The meter works in the monitoring mode 52 15 A delay of the alarm operation The lasting alarm state was shorter has been introduced e g 30 than the programmed e g during measurements however after the lasting time of the alarm the state this time the alarm has
13. enables the indication of the current time A5 or 4 digit display field digits of 14 or 20mm high in red or green colour ensures a good legibility at a long distance They realise other additional functions as signalling of the set alarm value overrunning e signalling of the measuring range overrunning e automatic set up of the decimal point e programming of the measurement repetition rate e programming of the averaging kind arithmetic mean stepping window programming of the voltage and current ratio e programming of the alarm and analogue output with the reaction to an optional measured quantity independently of currently displayed values storage of maximal and minimal values of all input quantities resetting of counters active reactive and apparent energy synchronisation of 15 minutes power 10 minutes voltage monitoring of set parameter values monitoring of all measuring quantities blocking of the parameter introduction by means of a password re calculation of the measuring quantity into an optional quantity on the base of an individual linear characteristic servicing of the interface with a MODBUS protocol both ASCII and RTU e conversion of the measured quantity into a standard programmable current or voltage signal highlighting of any optional measuring unit as per the order e storage of counter states in memory The N12P meter enables the measurement of 1 lt e Tru
14. not of alarm withdrawal occurs operate In that case the meter begins counting the measurements from the beginning 16 The meter does not establish Check whether leads of interface a communication with the A B GND were correctly computer connected Then check the setting of the interface trYb bAud Adr in the programming matrix These parameters must be the same as in the used software 10 PROGRAMMING EXAMPLES OF N12 METERS Example 1 Programming of an individual characteristic If we want to programme so that to the value 0 0 V will correspond the value 0 on the display whereas to the value 400 0 V will correspond the value 10000 one must e choose as the type of the input quantity the measurement of the voltage U e chose the Ind parameter and switch the individual characteristic on e chose the parameter H1 and introduce the value 0 0 e pass on the Y1 parameter and introduce the value 0 e pass on the H2 parameter and introduce the value 400 0 e pass on the Y2 parameter and introduce the value 10000 e pass on the d P parameter and set the point on 00000 53 Example 2 Programming of an inverse individual characteristic If we want to programme so that to the value 5 000 A will correspond the value 0 00 on the display whereas to the value 0 000 A will correspond the value 100 00 one must e choose as the type of the input quantity the measurement of the current e choose the I
15. sec one must e enter into the programming mode and choose the ALr1 level e pass on the P A1 parameter and set U e pass on the PrL1 parameter and introduce the value 100 0 e pass on the PrH1 parameter and introduce the value 300 0 e pass on the tYP1 parameter and choose the On function e pass on the dLY1 parameter and set 10 if UALZ2 in the contrary dLY 10 UAL x 0 55 e exit from the programming mode In case of the alarm state duration for a time longer than 10 sec the meter will switch the alarm relay on and the alarm diode will be lighted Example 5 Programming of the analogue output If we want to program so that to the 0 000 A value will correspond the 4 mA value on the current analogue output whereas to the 5 000 A value will correspond the 20 mA value one must e enter into the programming mode Pass on the P An parameter and choose the current I as the type of the input quantity e pass on the tYPA parameter responsible for the analogue output type Choose the PrAd current output e under the AnL parameter one must write down the value of the input signal for which we want 0 mA on the analogue output For this reason one must calculate the AnL parameter 5 000 0 000 20 00 4 00 20 3125 gt 0 000 4 00 x 0 3125 1 250 e choose the AnL parameter and introduce the value 1 250 e choose the AnH parameter and introduce the value 5 000 55 11 EXECUTION CODES revolutions frequenc
16. 0 7625 LEd1 w t 0 1 Support of alarm1 signalling Value 0 support switched off 1 support switched on 7252 7626 P A2 w t 0 14 Kind of quantity type on which the alarm 1 is to react Value 0 Rms voltage 1 Rms current 2 Frequency 3 Active power 4 Reactive power 5 Apparent power 6 Power factor 7 Ratio of reactive power to active power 8 Phase angle 9 Active energy 10 Reactive energy 11 Apparent energy 12 15 minutes mean active power 13 10 minutes mean voltage 14 10 seconds mean frequency 7254 7627 PrL2 w t 19999 99999 Lover threshold of the alarm 2 Change range as for the PrL1 parameter 7256 7628 PrH2 w t 19999 99999 Lover threshold of the alarm 2 Change range as for the PrL1 parameter Table 5 continuation 7258 7629 tYP2 0 4 Type of alarm 2 Value 0 Normal 1 Switched on 2 Switched off 3 Switched on manually 4 Switched off manually 7260 7630 dLY2 wit 0 99999 Delay of alarm 2 Value 0 9999 4 digit meters 0 99999 5 digit meters 7262 7631 LEd2 w t 0 1 Support of alarm2 signalling Value 0 support switched off 1 support switched on 7264 7632 TYPO occurs 7266 7633 ConO No occurs 7268 7634 P an w t 0 14 Kind of quantity type on which the analogue output will be to react Value 0 Rms voltage 1 Rms curre
17. 0 1 100 0 0 1 i v 0 2 Ul Rms voltage 4 400 0 4 400 0 0 1 i v 0 2 u l Rms current 0 01 1 000 0 01 1 000 0 1 i v 0 2 u l Rms current 0 05 5 000 0 05 5 000 0 1 i v 0 2 u l Frequency 10 00 100 00 10 00 99 99 0 1 i v 0 1 u l Active power 19999 99999 1999 9999 0 1 i v 0 5 u l Reactive power 19999 99999 1999 9999 0 1 i v 0 5 u l Apparent power 19999 99999 1999 9999 0 1 i v 0 5 u l Power factor 1 000 1 000 1 000 1 000 0 196 i v 1 u l 3 Ratio of reactive power to the active power Angle phase Active energy Reactive energy Apparent energy 15 minutes active power 10 minutes voltage 10 minutes voltage 10 seconds frequency Current time 100 0 100 0 100 0 100 0 0 359 9 0 359 9 19999 99999 1999 9999 19999 99999 1999 9999 19999 99999 1999 9999 19999 99999 1999 9999 1 100 0 1 100 0 4 400 0 4 400 0 10 00 100 00 10 00 99 99 0 00 23 59 0 00 23 59 ok ok ok hok ok oko Second 24 hours 0 1 i v 1 u l 0 1 i v 1 u l 0 1 i v 0 5 u l 0 1 i v 0 5 u l 0 1 i v 0 5 u l 0 1 i v 0 5 u l 0 1 i v 0 2 u l 0 1 i v 0 2 u l 0 196 i v 0 1 u l iv indicated value u l upper limit of the measuring sub range 3 error in the range 10 20 of the or U range
18. 00 2400 bit s 01 4800 bit s 10 9600 bit s Bit 5 7 Position of the decimal point 000 lack 001 0 0 010 0 00 011 0 000 100 0 0000 only for 5 digit meter executions Bit 4 Signalling of the range upper overrunning 0 normal work 1 range overrunning Bit 3 Signalling of the range lower overrunning 0 normal work 1 range overrunning Bit 2 Relay state alarm 2 0 switched off 1 switched on Bit 1 Relay state alarm 1 0 switched off 1 switched on Bit 0 Individual charakteristic 0 Individual charakteristic switched off 1 Individual charakteristic switched on 42 8 TECHNICAL DATA Panel meter dimensions Protection index ensured by the housing Protection index ensured from the terminal side Rated operating conditions supply voltage depended on the execution code supply voltage frequency ambient temperature air relative humidity Power consumption Storage temperature Display field N12P4 N12P5 96 x 48 x 93 mm IP 65 IP 20 85 230 253 V a c d c 20 24 40 V a c d c 40 50 440 Hz 20 23 50 C lt 95 water vapour condensation inadmissible max 7 VA 20 85 C four 7 segment LED displays and two alarm diodes five 7 segment LED displays two alarm diodes and two diodes for the unit highlighting Indication range of the digital display N12P4 N12P5 Servicing 1999 9999 19999 99999 four keys C Cw C e 43 Relay o
19. 45 Measurement of the rms a c voltage The voltage value is calculated according the formula U trUe Yu Basic error in reference conditions 0 1 i v 0 296 u l Calculation of the mean value in the walking period of 1 lt U s iis Us nou Where n averaging time in seconds Usk real rms value in the voltage period Usrsk mean value changing in the time of the rms voltage value Basic error 0 1 i v 0 296 u l Calculation of the 10 minutes voltage 1 10 nj U sr U sk i Basic error 0 1 i v 0 2 u l Measurement of the real rms a c current The value of the current is calculated according the formula 1 n 1 5irl 7 46 Where trl ratio of the current transformer n number of samples in the period or in the multiple of the measured current period i actual value of the current Basic error in reference conditions 0 1 i v 0 2 u l Calculation of the mean value in the walking period of time gt Where n averaging time in seconds Isk real rms value in the voltage period Isrsk mean value changing in the time of the rms current value Basic error 0 1 i v 0 296 u l Measurement of the a c active power The active power of the distorted current is calculated according the formula i l Where trU ratio of the voltage transformer trl ratio of the current transform
20. Fig 1 Overall dimensions Prepare a 92 x 45 95 mm hole in the panel The thickness of the material from which the panel is made can not exceed 15 mm One should introduce the meter from the front of the panel when the supply circuit is turned off After introducing the meter fasten it by means of holders 4 CONNECTION At the rear side of the meter there is a terminal strip seat A connector with screw terminals or a self locking connector is added to the meter depending on the meter type chosed in the ordering code The fig 2 shows the connection way of external signals The description of the connector is also printed on the meter housing In case of a meter wor king in an environment of high perturbances one should use external filters It is recommended to use screened leads on the meter input As a feeder cable one must use a two wire cable and choose the lead cross section such that in case of a short circuit from the device side the protection of the cable was ensured by means of the electric installation fuse Requirements related to the feeder cable are regulated by the IEC 61010 1 p 6 10 standard Current Voltage RS 485 analogue analogue a output output z 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 e 2 3 4 5 6 9 10 11 12 13 14 15 sas e 8 lub lub N Alarm 1 Alarm 2 N L B
21. PROGRAMMABLE DIGITAL PANEL METER N12P SERVICE MANUAL C DIGITAL PANEL METER N12P TYPE SERVICE MANUAL CONTENTS 1 APPEIGATIQN iiri teret rrr E 2 BASIC REQUIREMENTS OPERATIONAL SAFETY FITTING uu aa na deat deep etl tec 4 5 6 PROGRAMMING sse 14 7 BS 485 INTEREAGE dro aude 7 1 Connection way of the serial interface 7 2 Description of the MODBUS protocol implementation 7 3 Description of used functions 7 4 Register map of the N12P meter ssssssss 7 5 Registers for writing and read out sss 7 6 Registers only for read out sss 8 TECHNICAL DATA 43 9 BEFORE A FAILURE WILL BE DECLARED 51 10 PROGRAMMING EXAMPLES OF N12P METERS 53 11 EXECUTION CODES eene 12 MAINTENANCE AND guarantee 1 APPLICATION N12P programmable digital panel meters are destined to measure a c voltages and a c currents active reactive and apparent power power factor cosq ratio of the reactive power to the active power tgo phase angle frequency active reactive and apparent energy 15 minutes active power 10 minutes voltage 10 seconds frequency Additionally the meter
22. correspond to the order Symbols located in this service manual mean especially important one must acquaint with this before A connecting the meter The non observance of notices marked by these symbols can occasion the damage of the meter 0 one must take note of this when the meter is working inconsistently to the expectations 2 BASIC REQUIREMENTS OPERATIONAL SAFETY A N12P meters are destined to be mounted into panels and cubicles In the range of operational safety they are in conformity with the IEC 61010 1 A1 1996 standard requirements The installation and meter connection should be operated by qualified personnel One must take into consideration all accessible protection requirements Before switching the instrument on one must check the correctness of the network lead connection IEC 61010 1 p 6 10 and p 6 11 2 Incase of the protection terminal connection with a separate lead one must remember to connect it before the connection of network leads Do not connect the meter to the network through an autotransformer Before taking the meter housing out one must turn the supply off The removal of the meter housing during the guarantee contract period may cause its cancellation 3 FITTING N 67 max 93
23. ct rms current FrEq frequency P active power q reactive power S apparent power PF powerfactor tF ratio of reactive power to active power FI angle phase EnP active energy Enq reactive energy EnS apparent energy P_Au 15 minutes mean active power U Au 10 minutes mean voltage F Au 10 seconds mean frequency tyPA Type of analogue output PrAd current nAP voltage AnL Lower threshold ofthe analogue In 4 digit execution output 1999 9999 Itis the parameter defining the In 5 digit execution value on the display for which we 19999 99999 want obtain 0 on the analogue output 20 table 1 continuation AnH Upper threshold of the analogue In 4 digit execution output 1999 9999 Itis the parameter defining the value 5 digit execution on the display for which we want 19999 99999 obtain the max value 20 mA or 10 V on the analogue output bAud Baud rate of the RS 485 interface 2400 2400 bit s 4800 4800 bit s 9600 9600 bit s trYb Kind of transmission through the OFF interface off RS 485 interface A8n1 ASCII 8 1 A7E1 ASCII 7 1 701 ASCII 701 r8n2 RTU 812 8 1 RTU 8E1 r801 RTU 801 Adr Device address 0 247 SEt Writing down of manufacturer s settings pressure ofthe key Parameter values set up by the causes the writing down of standard manufacturer are shown in the table 2 parameters into the mete
24. dentifier r Constant identifying the device 0x64 N12P 7002 7501 Status r Status is the register describing the current state of the meter 7004 7502 Steering r It is the register describing the Steering of the analogue output 7006 7503 Minimum r Minimal value of the currently displayed value 7008 7504 Maximum r Maximal value of the currently displayed value 7010 7505 Displayed value r Currently displayed value 7012 7506 No occurs 7014 7507 occurs 7016 7508 No occurs 7018 7509 U r V Rms voltage 7020 7510 r A Rms current 1022 754 P r Active power 1024 7512 r VAr Reactive power 7026 7513 S r VA Apparent power 7028 7514 PF r Power factor 7030 7515 tF r Rato of reactive power to active ower 7032 7516 Fi r i Angle phase 7034 7517 Freq r Hz Frequency 7036 7518 E nP r Wh Active energy 7038 7519 E r Reactive energy 7040 7520 E nS r VAh Apparent energy 39 1 2 3 5 6 7042 7521 P Au 15 minutes mean active power 7044 7522 U Au V 10 minutes mean voltage 7046 7523 F Au Hz 10 seconds mean frequency 7048 7524 Hour gg mmss Current 7050 7525 U min V Minimal value of rms voltage 7052 7526 U max V Maximal value of rms voltage 7054 7527 min Minimal value of rms current 1056 7528 max Maxi
25. e Master function The MODBUS asynchronous character communication protocol has been implemented on the serial link The transmission protocol describes the ways of information exchange between devices through the serial link 7 1 Connection way of the serial interface The RS 485 standard enables the direct connection to 32 devices on a single serial link of 1200 m long For the connection of a greater quantity of devices it is necessary to apply additional intermediate separating systems The lead out of the interface line is given in the meter service manual To obtain a correct transmission it is necessary to connect lines A and B in parallel with their equivalents in other devices Maximum 1200 m A TX A Computer PC N12 Meter RX t B N12 Meter B B N12 Meter A Fig 7 Way of the RS 485 interface connection 26 The connection must carried out with screened lead The screen must be connected to the protective grounding in a single point The GND line serves to an additional protection of the interface line for long connections One must connect it to the protective grounding this is not ne cessary for the interface correct work In order to obtain the connection with an IBM PC computer an RS 485 interface card or a RS 232 RS 485 converter is indispensable On the Fig 7 the device connection is shown The marking of the transmission line for the card in the PC computer depends on t
26. e rms voltage eee Ug 225 i l 1 10 e 10 minutes mean voltage 0 U s i l 14 e Tr rms current eee debe nal isl 1 z Active POWER E uq 1 n i i e Mean active power 0 to 3600 sec e g 15 minutes P i l Se e Active energy u E gt ah i 1 e Apparent power a S U Le e Apparent energy no aS i l e Reactive power Q sign 52 p Le e Reactive energy E x aQ i l P e Power factor aaa nnns e Ratio of the reactive power to active Z e Phase angle treten si are cos _ 1 e Voltage frequency u f 7 mean 10 seconds f External ratios of measuring current and voltage transformers are taken into consideration in measurements The ratio is optionally programmed With the meter we deliver a guarantee card 4 holders to fix the meter on a panel a service manual a plug with screw connections self locking connections a set of stickers with units When unpacking the meter please check whether the type and execution code on the data plate
27. ent start of he 15 minutes mean active power CUAu Synchronisation of the 10 minutes The pressure of the lt key mean voltage Exit of the parameter group from the chosen level will cause the measurement start of he 10 minutes mean voltage The pressure of the lt key causes the exit of the parameter group from the chosen level 22 Contact state Relay switched on 0 1 a Relay 1 1 switched off gt Measured quantity PrL PrH PrH PrL b nor Contact state 1 Relay switched off 0 t I switched on gt PrH Measured quantity PrH PrL OFF Contact state 1 Relay Relay switched on switched on iRelay I switched off T T gt PrH Measured quantity d On Contact state Relay Relay Relay el switched off switched off switched on PrH Measured quantity Fig 6 Alarm type a b normal c switched off d switched on 23 CAUTION A e In case of On and OFF alarm types the writing down of PrL gt PrH will cause an automatic transcription of the value from the threshold PrL into PrH and from threshold PrH into PrL The alarm type will not change In case of a measuring range exceeding the relay reaction is concordant with written down PrL PrH and tYP parameters In spite o
28. er n number of samples in the period or in the multiple of the measured current period u actual value of voltage i actual value of current Basic error in reference conditions 0 1 i v 0 596 u l 47 Calculation of the mean value in the walking period of 1 n Where n averaging time in seconds Pi value of the active power in the period of the measured signal Psr mean value changing in the time of the active power value Basic error 0 1 i v 0 596 u l Calculation of the active power energy Le AUR Basic error 0 1 i v 0 5 u l Measurement of the a c apparent power The apparent power is calculated according the formula S trU etr eU eT Where trU ratio of the voltage transformer trl ratio of the current transformer Usk real rms value of the voltage Isk real rms value of the current Basic error in reference conditions 0 1 i v 0 5 u l Counting of the apparent power energy 1 n aS Basic error 0 1 i v 0 596 u l 46 Measurement of a c reactive power The reactive power is calculated according the formula Where trU ratio of the voltage transformer tr ratio of the current transformer S apparent power P active power Q trU etrle sign _ P Basic error in reference conditions 0 1 i v 0 596 u l Counting of the reactive power energy Iw Eo aQ n j l Basic error 0 1 i v
29. es nor normal On switched on OFF switched off H On manually switched on till he time of the alarm type change he alarm output is switched on for good H OF manually switched off till he time of the alarm type change he alarm output is switched off for good dLY1 dLY2 Delay ofthe alarm operation The parameter is defined in number of measurements e that one should give after how many measurement will be to operate the alarm The alarm Switching off follows without delay The parameter takes in account the number of averaged measurements UAL i e the whole averaging cycle is treated as a single measurement n 4 digit execution 0 9999 n 5 digit execution 0 99999 The introduction of 0 causes the operation at the moment of alarm appearance 19 table 1 continuation LEd1 Support ofthe alarm signalling Inthe On support switched on LEd2 situation when the function of support OFF support switched off is switched on after the withdrawal of the alarm state the signalling diode is not blanked The function signals the alarm state till the moment of its blanking by means of the combination of C Jand keys This function only and exclusively concerns the alarm signalling and the relay contacts will act without support according the chosen alarm type P An Kind ofthe input quantity type on U rms voltage which the analogue outputis to rea
30. f displaying the exceeding the meter will carry out the measurement as before e In case of an individual characteristic switching on IndzOn the measurement result is transformed linearly in accordance with introduced H1 Y1 H2 Y2 parameters The linear characteristic does not operate in case of selection as an input type of the cur rent time The meter currently checks up the value of the actually introduced parameter In case when the introduced value overruns the upper range of changes given in the table 1 the meter will automatically carry out the change into the minimal value Similarly in case when the introduced value overruns the lower range of changes given in the table 1 the meter will automatically carry out the chan ge into the maximal value 24 Standard parameters of the meter Parameter symbol tYP Level in the matrix Standard value Table 2 RAnU trU trl Aur UAL Ind 1 1 2 2 1 1 1 1 1 1 1 1 1 1 2 3 2 2 3 tYP1 tYP2 N dLY1 dLY2 m LEd1 LEd2 N Co P An AnL AnH bAud trYb Adr SEC Hour JEd mino 5 5 5 25 7 RS 485 INTERFACE N12 programmable digital meter series have their serial link in the RS 485 standard to communicate in computer systems and with other devices fulfilling th
31. he card producer 7 2 Description of the MODBUS protocol implementation The implemented protocol is compatible with the PI MBUS 300 Rev G Modicon Company Setting up of meter serial link parameters in the MODBUS protocol meter address 1 247 baud rate 2400 4800 9600 bps working modes ASCII RTU information unit ASCII 8N1 7E1 701 RTU 8N2 8E1 801 maximal response time 300 ms The parameter configuration of the serial link is described in the further parts of this service manual It consists on the settlement of the baud rates bAud parameter device address Adr parameter and the information unit type trYb parameter Notice Each meter connected to the communication network must have aunique address different from addresses of other devices connected in the network an identical baud rate and information type 27 7 3 Description of used functions Following functions of the MODBUS protocol have been implemen ted in meters of N12 series Description of functions Table 3 Identification of the slave device Notice In meters of N12 series the response frame to the function 17 looks as follows Device Function Number Device Device Field depending Control address of bytes identifier state on the device type total Tr es Te Device address depending on the set value Function function No 0x11 Number of bytes 0x08 Device identifier 0x60 N12S 0x61
32. ing matrix is secured by the safeguard code The pressure and holding down of the key during ca 3 sec causes the entry into the monitoring menu one must move through the monitoring menu by means of Jand 4 keys In this menu all programmable meter parameters except service parameters are only accessible to the read out The exit from the monitoring menu takes place by means of the key On the monitoring menu parameter symbols are alternately displayed to gether with their values The fig 4 shows the operation algorithm of the meter The pressure and holding down of keys during ca 3 sec causes the entry in to the monitoring menu of measured value One must move through the monitoring menu by means of lt Jand 4 keys The pressure of the lt key causes the display of the successive symbol of the measured value alternately with the value and the multiplier of this value in one of the shape 10E0 10E3 10E6 10E9 12 Durser3 dZLN 991 JO r Bla uonduosul Jo Aejdsiq enjeA uiu uoronpoJjul Jo Busey puomssed Jo e dsiq Jo ejdsiq Jo Buisei3 Cv Xe 35 A1NaWaunsvalW
33. ing of the minimal value 7282 7641 Del maks w t 0 1 Value 0 lack of operation 1 Erasing of the minimal value Erasing of the maximal value T284 7642 Start stop resetting No occurs Value 0 lack of operation 1 Erasing of the maximal value 3 N Table 5 continuation 7286 7643 w Resetting of the active energy counter Value 0 ack of operation 1 Resetting of the active energy counter 7288 7644 CEnq w Resetting of the active energy counter Value 0 ack of operation 1 Resetting of the reactive energy counter 7290 7645 CEnS w Resetting of the apparent energy counter Value 0 ack of operation 1 Resetting of the apparent energy counter 7292 7646 CPAu w Synchronization of the 15 minutes mean power Value 0 lack of operation 1 start of the synchronization of the 15 minutes mean power 7294 7647 w Synchronization of the 10 minutes mean voltage Value 0 lack of operation 1 start of the synchronization of the 10 minutes mean voltage 1 In case of registers no occurring in the given series of meters their value is equal 1E 20 36 7 6 Registers only to read out 222 22 s 265 8 Writing E gy z 5 RUN Unit Name of the quantity 1 2 3 4 5 6 7000 7500 I
34. is blanked 3 Only the horizontal dashes are displayed Check the correctness of the input signal connection See in the service manual 4 Only the inscription noC is displayed The meter is discalibrated Contact the nearest authorized service workshop 5 Lack of possibility to enter into the programming mode The inscription ErrC is displayed The programming mode is protected by the password If the user forgets which password has been introduced one must contact the nearest authorized service workshop 6 Lack of certainty if all display segments are efficient Enter into the service mode and Switch on the display test Simultane ously the same segments should be lighted on all displays The state with blanked displays does never occur Otherwise submit the defect to the nearest authorized service workshop 51 7 During the operation in the programming mode parameter values inconsistent with the range of changes given in the table 1 appear on the display Enter into the service mode and accept the SEt parameter The meter will introduce values in accordance with the table 2 8 A result inconsistent with our expectations occurs on the display Check if the individual characteristic is not switched on In case of necessity enter into the service mode and accept the SEt parameter The meter will introduce parameters in accordance with the table 2 9 H1 Y1 H2
35. mal value of rms current 7058 7529 P min Minimal value of active power 7060 7530 max Maximal value of active power 1062 7531 min VAr Minimal value of reactive power 7064 7532 max Maximal value of reactive power 7066 7533 S min VA Minimal value of the apparent power 7068 7534 5 Maximal value of the apparen power 7070 7535 PF min Minimal value of the power factor 7072 7536 _ Maximal value of the power factor 7074 7537 tF_min Minimal value of the ratio of the reactive power to the active power 7076 7538 tF Maximal value of the ratio of the reactive power to the active power 7078 7539 Fi min 9 Minimal value of the phase angle 7080 7540 Fi max 9 Maximal value of the phase angle 7082 7541 Freq min Hz Minimal value of the frequency 7084 7542 Freq max Hz Maximal value of the frequency 7086 7543 P An min Minimal value of the 15 minutes mean active power 7088 7544 P An max Maximal value of the 15 minutes mean active power 7090 7545 An min Minimal value of the 10 minutes mean voltage 7092 7546 U An max Maximal value of the 10 minutes mean voltage 7094 7547 F An min Hz Minimal value of the 10 seconds mean frequency 7096 7548 F An max Hz Maximal value of the 10 seconds mean frequency 40 1 Incase of registers n
36. nd parameter and switch the individual characteristic on choose the H1 parameter and introduce the value 0 000 pass on the Y1 parameter and introduce the value 100 00 pass on the H2 parameter and introduce the value 5 000 pass on the Y2 parameter and introduce the value 0 00 pass on the P parameter and set the decimal point on the position 000 00 Example 3 Programming of the alarm with hysteresis If we want to programme the alarm 1 operation so that the alarm will be switched on at the value 400 0 V whereas switched off at the value 100 0 V and the alarm 2 so that at the value 5 000 A the alarm will be switched off and switched on at the value 1 000 A one must e enter into the programming mode and choose the level with the ALr1 symbol pass on the P A1 parameter and set U pass on the PrL1 parameter and introduce the value 100 0 pass on the PrH1 parameter and introduce the value 400 0 pass on the tYP1 parameter and choose the function designed as nor exit from the ALr1 level and pass on the ALr2 level pass on the P A2 parameter and introduce choose the PrL2 parameter and introduce the value 5 000 pass on the PrH2 parameter and introduce the value 1 000 pass on the tYP2 parameter and choose the function nor 54 Example 4 Programming of an alarm operating in the given interval with delay If we want that the alarm 1 will be switched on in the interval from 100 0 V up to 300 0 V and operated only after 10
37. nt 2 Frequency 3 Active power 4 Reactive power 5 Apparent power 6 Power factor 7 Ratio of reactive power to active power 8 Phase angle 9 Active energy 10 Reactive energy 11 Apparent energy 12 15 minutes mean active power 13 10 minutes mean voltage 14 10 seconds mean frequency Table 5 continuation 7270 7635 w t 0 1 Type of analogue output 7272 7636 AnL w t 19999 99999 Value 0 current 1 voltage Lover threshold of the analogue output 7274 7637 AnH w t 19999 99999 Change range as for the PrL1 parameter Upper threshold of the analogue output 7276 7638 Hour w t 0 99999 Change range as for PrL1 parameter Current time 7278 7639 JEd w t 0 1 This parameter occurs with two places after the decimal point in the gg mm format where gg means hours mm means minutes In case of the minute introduction with a value greater than 0 59 e g 0 70 the meter will carry out the correction and write the value 1 10 In case of the hour introduction with a value greater than 23 e g 27 the meter will carry out the correction of the error and write the value 3 00 Switching on of switching off of the unit highlighting 7280 7640 Del min w r 0 1 Value 0 Highlighting switched off 1 Highlighting switched on occurs only in 5 digit meters Eras
38. o occuring in the given series of meters their value is equal 1E 20 Caution At the moment of the upper or lower range exceeding parameters Displayed value minimum maximum are set up 1 20 Description of the status register E o 5 3 8 58 5 S o 5 D 8 2 a 8 S oe dms Eg g 3 WO 58 gt S oO oO lt s o 8 S Sea 82 52593 o 5 9 Bs g o 290 2 g 5 S 5 Do 5 2225 v o vrv o 529 gt F EOD 55 E 595 4 Zi 5 25 205 o 5 obese SE c a jnr XIX IX X X XIX XX X X X X X bits 15 14 13 12 11 109 8 7 6 5 4 3 2 0 MSB LSB Bit 15 Kind of display 0 meter with a 4 digit display 1 meter with a 5 digit display Bit 14 Compensation error of the lead resistance 0 lack of error 1 signalling a compensation error Caution This bit is only set in the N12T meter For other types of N12 meter executions the value of this bit is optional Bit 13 Kind of output voltage current 0 current 1 voltage 41 Bit 12 10 Working mode and information unit 000 interface switched off 001 8N1 ASCII 010 7E1 ASCII 011 7O1 ASCII 100 8N2 RTU 101 8E1 RTU 110 801 RTU Bit 8 9 Baud rate
39. r The execution of this operation is signalled by the inscription End SEC Introduction of a new password In 4 digit execution 1999 9999 In 5 digit execution 19999 99999 tSt Display test The test consists on the The pressure of the key causes the consecutive switching of digital display segments on Alarm diodes and highlighted diodes of the unit should be lightend test switching on The ends the test 21 table 1 continuation Hour Setup ofthe current time 0 00 23 59 The introduction of an incorrect hour will cause its writing into the memory but after the exit from the matrix the meter will make the correction of the error i e the introduction of the 0 70 hour will cause thatthe meter will treat that as minutes and setup 1 10 JEd Unit highlighting switching on On highlighting switched on OFF highlighting switched off CEnP Resetting of the active power counter The pressure of the lt key will cause the resetting ofthe active power counter CEnq Resetting of the reactive power he pressure of the lt key counter will cause the resetting of the reactive power counter CEnS Resetting of the apparent power The pressure ofthe lt key counter will cause the resetting of the apparent power counter CPAu Synchronisation of the 15 minutes The pressure of the lt key mean active power will cause the measurem
40. r the Y1 parameter 33 Table 5 continuation 7240 7620 P A1 w t 0 14 Kind of quantity type on which the alarm 1 is to react Value 0 Rms voltage 1 Rms current 2 Frequency 3 Active power 4 Reactive power 5 Apparent power 6 Power factor 7 Ratio of reactive power to active power 8 Phase angle 9 Active energy 10 Reactive energy 11 Apparent energy 12 15 minutes mean active power 13 10 minutes mean voltage 14 10 seconds mean frequency 7242 7621 PrL1 wit 19999 99999 Lower threshold of alarm 1 Value 1999 9999 4 digit meters 19999 99999 5 digit meters For Ind 0 OFF When the individual characteristic is switched out the range change will be as for the parameter H1 For Ind 0 ON When the individual characteristic is switched on the range change will be as for the parameter Y1 7244 7622 PrH1 w t 19999 99999 Upper threshold of alarm 1 Change range as for the PrL1 parameter 7246 7623 tYP1 0 4 Type of alarm 1 Value 0 Normal 1 Switched on 2 Switched off 1 Switched on manually 1 Switched off manually Table 5 continuation 7248 7624 dLY1 w t 0 99999 Delay of alarm 1 Value 0 9999 4 digit meters 0 99999 5 digit meters 725
41. t set up 0 00 Frequency automatically Powers Set up 7234 7617 Y1 w t 19999 99999 Table 5 continuation 0 00 Energies 0 000 Power factor 0 0 Ratio of reaktive power to active power 0 0 Phase angle automatically 15 minutes mean active power set up 0 0 0 minutes mean voltage 0 00 0 seconds mean frequency Current time The range of H1 and H2 parameters depends on the max range of the input signal The writing of the value with a greater number of significant places after the decimal point will cause its round off Values beyond the range cause the return of the error code 03 not allowed data value Parameter of the individual characteristic 7236 7618 H2 w t 19999 99999 Value 0 9999 4 digit meters 0 99999 5 digit meters The Y1 Y2 PrL1 PrH1 PrL2 PrH2 AnL AnH parameter range after switching the characteristic on depends only on the set decimal point d P The writing of the value with a greater number of significant places after the decimal point will cause its round off Values beyond the range cause the return of the error code 03 not allowed data value Parameter of the individual characteristic 7238 7619 Y2 w r 19999 99999 Change range as for the H1 parameter Parameter of the individual characteristic Change range as fo
42. the programming matrix into measurement one must press the C key The inscription HEY occurs and after ca 5 sec the meter will automatically enter into the measurement of the input quantity Way of changing the value of the chosen parameter In order to increase the value of the chosen parameter one must press the amp key A single pressure of this key causes a value increase of 1 The hold of the pressed key causes conti nuous increase of the value up to display the 0 value The jump to the next digit follows after this value The further chan ge is similar The key release in any moment causes a jump to the first digit It is similarly in case of the value decrease The single pressure of the key causes a value decrease of The hold of the Y key pressure causes a continuous decrease of the value till the display of 0 The jump to the next digit follows after this value The further change is similar In any mo ment the key release causes a jump on the first digit In order to accept the set up parameter one must press the lt key Then the writing of the parameter and display of its symbol follow alternately with the new value The pressure of the key during the change of the parameter causes the resignation of the writing 15 ay Blg 0 ig Juou s neng qo juod 777
43. utputs programmable alarm thresholds three types of alarms see chapter 6 hysteresis defined by means of the lower and upper alarm threshold signalling of alarm action by means of diodes programmable delay of the alarm operation two relay outputs voltageless make contacts maximal load capacity voltage 250 V a c 150 V d c current 5 A 30 V d c 250 V a c resistance load 1250 VA 150 W Analogue output current programmable 0 4 20 mA load resistance lt 500 Q voltage programmable 0 10 V load resistance gt 500 Q galvanic insulation resolution 0 0196 of the range basic error 0 1 96 i v 0 2 u l Digital output RS 485 interface MODBUS transmission protocol ASCII 8N1 7E1 7O1 RTU 8N2 8E1 801 Baud rate 2400 4800 9600 bauds Maximal response time for query frame 300 ms Fastness against supply decays acc EN 61000 6 2 2002 Electromagnetic compatibility immunity acc EN 61000 6 2 2002 emission acc EN 61000 6 4 2002 2 i v indicated value u l upper limit of the measuring subrange 44 Safety requirements according IEC 61010 1 standard installation category level of polution 2 maximal voltage in relation to the earth 600 V a c Parameters of the meter prolonget overrunning of the upper range 20 Kind of input Rated indication range Basic error 5 digits 4 digits Rms voltage 1 100
44. value to increase the value displaying of the maximal value display of the maximal value monitoring menu of measured parameters entry to the parameter group level e moving through the chosen level change of the chosen parameter value increase of the value succeeding parameter in the monitoring mode w key to decrease the value displaying of the minimal value display of the minimal value monitoring menu of measured parameters entry to the parameter group level e moving through the chosen level change of the chosen parameter value decrease of the value succeeding parameter in the monitoring mode C cancel key entry to the menu of parameter monitoring hold down during ca 3 seconds 11 exit from the monitoring menu of meter parameters and measured values cancel of the parameter change e absolute exit from the programming mode The pressure ofthe amp J key combination and holding down during ca 3 sec causes the erasing of alarm signalling This opera tion exclusively acts when the support function is switched on The pressure of the key combination causes the erasing of all minimal value The pressure of the 4 key combination causes the erasing of all maximal values The pressure and holding down of the key during ca 3 sec causes the entry into the programming matrix The programm
45. y period pulses single phase network parameters indicator for synoptic panels on order Number of display 4 x 20 mm high digits 5 x 14 mm high digits unit Display colour Supply voltage 290 V a 1 24 eee 2 Kind of terminals Socked plug with screw connections Socked plug with self locking connections Execution standard custom made Acceptance tests Without a quality acceptance certificate With a quality inspection certificate acc customer s agreement Introduce the unit symbol 56 N12 METER x XX XXX Input unit temperature programmable input T symbol 1Vd c 10 V d c 20 mA d c 200 mA d c 5 600 Vd c TA diu oae H Order example N12P 5 0 1 0 00 0 kW means a N12P digital meter of single phase network parameters with 5 displays in red colour voltage supply 230 V a c d c kind of terminal socket plug with screw connection standard execution without a quality acceptance certificate with the highlighted KW unit In case of a custom made execution or need of more detailed technical information please contact our Export Department In case of any meter failure one must contact the nearest
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