User manual MIDO MEASUREMENT APPARATUS 1
Contents
1. Per 2 remote alarm relays Add the Code 2 e g MIDO C2 Per 2 digital outputs Add the Code 3 e g MIDO C3 Per 2 digital inputs Add the Code 4 e g MIDO C4 For non volatile memory Add the Code 5 e g MIDO C5 For 1 digital input 1 remote alarm relay Add the Code 6 e g MIDO C6 For analogue I O Add the Code 7 e g MIDO C7 The instrument can be fitted with a maximum of two options Example MIDO C option 1 option 1 MIDO C11 code equivalent to network analyser series MIDO C with serial RS485 and 4 2 2 local alarm relays dossena The instrument can display the following measurements subdivided into 22 pages page 3 9 Display pages Page 1 V1 V2 V3 Voltages of each phase Page 2 V12 V23 V31 Concatenated voltages Page 3 11 12 13 Currents of each line Page 4 PF1 PF2 PF3 Power factors for each phase Page 5 VA1 VA2 VA3 Apparent power for each phase Page 6 W1 W2 W3 Active power for each phase Page 7 Var1 Var2 Var3 Reactive power for each phase Page 8 2V 21 2PF Voltage current and power factor three phase equivalents Page 9 2VA W 2Var Three phase apparent active and reactive power Page 10 Hz IN Frequency and current of neutral Page 11 Wh Wh Active energy absorbed and active energy generated Page 12 VarhL VarLh Positive inductive reactive energy absorbed2. KTA and KTV coincide with the constants inserted in the instrument in the AT and VT configuration pages pages 2 and 3 of the setup menu The wiring diagram is as shown below Modular Built in 5 6 7 8 26 27 28 29 eS CN a D T a D C gt C gt us Xe Zt XQ ad a oe eee is aa N L L L e ACTIVE REACTIVE ACTIVE REACTIVE 23 4 Code 4 option Digital input option When the MIDO is equipped with digital inputs and is connected to GMC GME type tariff energy meters the energy is no longer metered by calculation from the measurements but by counting the pulses recorded on the digital inputs In that case one will see an increase only in the counters of energy utilised Wh and VArhL For the calculation to be correct the constants that allow the MIDO to get back to the amount of energy corresponding to a pulse must be correctly set The constants of any transformers present upstream of the GMC GME and the constants that indicate how many pulses are provided by the GMC GME for each kWh and for each kVArh must therefore be set To configure these parameters enter the SETUP menu and go to page 10 Nr Imp KWh 8000 The number of pulses Imp corresponding to 1 KWh is set at a default of 8000 To change this value press the A and Vv keys Press ENTER to confirm or SETUP to cancel Follow the same procedure to configure the following page where the number of pulses per KVArh can be set The following pages of the SETUP menu
3. L1 gt S1 jal 2 L2 sia gt L2 J g L3 a he L1 gt n gt O00000000000000000 OO009 ROROROG dossena 11 Single phase wiring diagram Modular 18 19 20 21 22 23 25 27 29 30 31 32 33 34 OQOQOOYUCOQOOOOCO0O OO Vaux 1 2 Built in page OOOOOOOOOO OOOOCO0OO L1 OOO0O0O 1234 OOCO Vaux OO S1 16 15 141 QO 312 1 Q 18 21 OQOQOQOQ 19 17 4 Note In cases of correct single phase insertion all the quantities for phases 1 and 3 which are not in fact connected will be nil Furthermore the energies indicated with the three phase symbol gt coincide with the energies consumed by the connected phase alone 12 Insertion methods Inserzione su reti trifase senza neutro Inserzione su reti trifase pi neutro R o gt R S S i 2 d S T spg d T if o T 7 o N gt TA1 TA2 TA3 TA1 TA2 TAS MIDO MIDO Inserzione su reti trifas e a tre fili Inserzione su reti trifase a tre fili INSERZIONE ARON mediante trasformatori voltmetrici e amperometrici R Je gt R sso S 7 gt S gt T 7 Sn 2 gt T s10 gt B A B TA1 TA2 TA3 TAS dossena page 5 13 Instrument p
4. The MIDO can be equipped with a maximum of 2 remotely controllable relay options Each option acquired manages 2 normally open relays When the MIDO is equipped with 2 relay options it can therefore operate up to a maximum of 4 normally open relays through a specific MODBUS RTU command on serial See the protocol manual attached to this user manual or available directly from Dossena The wiring diagram is shown below Modular Built in 1 2 3 4 5678 22 23 24 25 26 27 28 29 ie a a a a ae CYC ae a ae eS ee eo a Mca Nad el ee eo Wea Sa A AA at a et SL AAAA L L J L a L l LA Ll Ll X2 X4 X8 l X1 X2 X4 X8 23 3 Code 3 option Digital output options The MIDO equipped with this option has two digital outputs by which the values of active and reactive energy can by transmitted in the form of pulses It is possible to calculate the number of Wh and VArh to which each pulse corresponds by a simple calculation which will be described in what follows the duration of the pulses is fixed at 80 ms The two outputs are associated permanently one with positive active energy and the other with positive reactive energy To calculate the energy associated with each pulse one needs to know the transformation constants of the voltmeter and amperometer transducers present if any and perform the following calculation dossena page 10 Active energy per pulse KTA KTV 0 5 Wh Reactive energy per pulse KTA KTV 0 5 Varh Note
5. negative inductive reactive energy generated Page 13 VarhC VarhC Positive capacitive reactive energy absorbed negative capacitive reactive energy generated Page 14 WTT Var T Average active and reactive power committed in the integration time settable Page 15 Max gt V Max2I Peak values of three phase voltage and current Page 16 Max2W Max2Var Peak values of three phase active and reactive power Page 17 oe MaxI2 Peak values of each phase current Page 18 Max TT MaxVarTl Peak values of average active and reactive power engaged in the integration time Page 19 TV1 TV2 Tv3 Total harmonic distortion of each individual phase voltage Page 20 T11 T12 TI3 Total harmonic distortion of each individual line current Page 21 Hours Number of hours of operation of the plant Page 22 Temp C Temperature in the product and maximum temperature recorded MaxTemp C These quantities are always calculated not only when displayed The values are calculated on 4 quadrants This means that the power may be negative Three methods of entering are provided for monophase with 4 and with 3 lines In this last case the quantities are published correctly only if there is no return current on the neutral that is if the load is balanced 10 Three phase wiring diagram Modular Built in SECOLE GOEG BOO 09090 BOOOOY Vaux aux STi S2 L3 Sts
6. or request it directly from Dossena The wiring diagram is shown below Modular Built in 11 12 13 i 8 9 10 OOO OCO 444 vv ABS ABR D D 14 4 Setting the integration time for average quantities MIDO calculates the average powers over an integration period for active and reactive powers and the corresponding energy consumed in that period The period over which these quantities are calculated can be set by the user To configure this value enter the SETUP menu and go the INTEGRATION TIME setting page to change its value The period of time chosen will be used for calculation of all the integrated quantities The range of times permitted goes from 1 minute to 60 minutes The default value is 15 minutes 14 5 Password setting and enabling By using a protection password one can prevent zeroing of the meters and modification of the setup parameters The password consists of a code of four digits initially set as 1234 The password is written in clear that is one can see the numbers as one writes them When entering the configuration menu for the first time the following page appears on screen PASSWORD Active NO Press SETUP or ENTER to exit the password enabling mode and proceed with its setting Press the A or W keys to select password enabling The following appears on screen PASSWORD Active YES To confirm enabling press ENTER to cancel enabling press SETUP When the password is enabled the user can personalis
7. 50 Hz for 60 sec Operating temperature 0 50 C Storage Temperature 20 70 C Display Display LCD 2x16 backlit blue Protection rating Frontal IP 52 Casing IP 20 Terminals Max section of the conductor 2 5 mm Amperometric terminals Max section of the conductor 4 mm Alarm relay contacts output optional NA max 3A 250V AC Weight 450g 2 Dimensions a 96 gt A rN o S bd y dossena page 2 3 Introduction The three phase measurement apparatus for panel mounting on DIN bar and for MIDO control panel is an instrument for measurement of electrical quantities The apparatus makes it possible to measure and display the electrical quantities of each individual phase or those of a three phase system with or without neutral 4 Safety precautions Before installing the instrument read the following manual carefully The installation and connection operations must be performed following normal safety procedures Make the connections with the power supply cut off 5 Auxiliary power supply Before connecting power to the instrument make sure that the voltage available is within the range of voltages suitable for the instrument and stated in the manual Protect the instrument with a 0 1 A delayed fuse 6 Voltage measurement inputs The instruments are capable of measuring on lines with a maximum operating v
8. E EEEa TARE RA E AEE EO E RETETE AE EEE ERA TERNE AN E EE 5 14 2 Setting the AT TatiO rossini eke ek rinitheanacs cxceta lid seennaees iapdat aedivese theta dosacansessscepbennetlinans dived Sacansede OE PERE RET HEEK AKESE S i 5 14 3 Configuration of the serial output MIDO C D E F o oo eecesesessssssseeeeeeeeeeeeeceesesesenenenescscnsneeseaeacaeaeaeacseeeeeeeeeeeeeeereaes 5 14 3 1 RS232 Serial communication MIDO D F u ecececeecsecesesesesesesesesenesesenenencucaeacsesescsesesescseseseseececeeaeseneneaesenesestaeaeaeaeeees 6 14 3 2 RS485 Serial communication MIDO C E i ccccccccccccccsessssesesececsessssesesececsesssassesesessesesssesesesceesesasesesecscsesacseeeeececseees 6 14 4 Setting the integration time for average quantities eee ee ececetesesessssseneeseseeeececeesesesenesescsensneseseseaeacaeaeaeeneeseeteeseseeeass 6 14 5 Password Setting and enabling c ce cccccesesesesesesessccesesesesesesesesesesesescseseseceescaesesensnsssnenssssscaeseaeaeeeseseseeeceeeeeeeeeeatseseeeeenes 6 14 6 Zeroing the quantities memorised cece ccc cece esesesesesesesescsescnsesesesesesescseseseseseseecececsesesesensassesessseseseaeaeaeaeaeaeeeeeeseetenenenseaes 7 14 7 Summary of default parameter eccccecsesesescssssssssesesesesesesesesesesesesesececsceesesesenenssesssessceacassesesesesesesesececsceeseseatasaeseseees 7 15 ENCO eniro e E E cosgetsstonsucy ceucontvanbuanapebsdeatsstastacs ceutenssaebnescs EN ETENE ON E 7 16 Peak valies
9. dossena Dossena snc di Barbati Agostino amp C Via Ada Negri 1 e 26824 Cavenago d Adda Lodi e Italy e Tel 39371 4497 1 e Fax 39 371 70202 www dossena it E mail dossena dossena t R I P I C F 00854320157 MIDO 1 SETUP Key for access to the configuration menu 2 Multifunction key confirm and save configuration data selection of autoscroll pages 3 Scrolling pages and setting configuration values T 0 gt Apparecchiature elettroniche per applicazioni nel settore elettrico Electronics equipment for electrotechnical applications ret Ai 1962 2002 150 7001 2000 Certiied Quality System Certif N 1475 98 e R E A di LODI n 604734 User manual MIDO MEASUREMENT APPARATUS K 18 19 0 21 22345 BA D S DS MEW oo0o0o0o000000o000000000O 3 Digital Instrument gt Multiplier of unit of Identifier of the Number measurement quantity ane unit of of the phase Value K V kiv ls measured 919 91919 91919 Page identifier 1 2 1 Technical characteristics Power supply 115 230 V AC 15 20 50 60 Hz Input Max 4 VA Voltage measurement inputs Nominal 440 Vrms phase phase Max 600 Vrms phase phase 750 Vrms for 60 sec 900 Vrms for 1 sec Current measurement inputs In 5A from AT Overloads 1 2 In permanent 10 In for 60 sec Insulation tests 3 3 kV
10. e the access number To personalise the password use the A and W keys to increase or decrease the number To confirm and enable the new password hold down the ENTER key for 3 seconds Once the password has been set it will no longer be possible to enter setup without identifying the right number for the password In fact on attempting to enter the setup menu the display shown below will appear PASSWORD Insert 1 If a wrong password is entered and the ENTER key on the instrument is pressed the following display will appear PASSWORD Access Impossib Automatically the instrument will return to the password entry page one can then try again to enter the correct password number or else return to the measurement mode by pressing the SETUP key for about 3 seconds The system will return automatically to measurement mode after 15 seconds Note If the password is lost contact Dossena giving details of the apparatus dossena page 7 14 6 Zeroing the quantities memorised The MIDO memorises the following quantities in a non volatile internal memory e Three phase energy active inductive reactive and capacitive reactive e Peak values of the most important quantities measured e Hours of operation All these quantities can be zeroed In that way their calculation can be restarted from zero The procedure to follow to zero the quantities listed is identical for all those listed that can be zeroed If for example one wants to zero the energ
11. e the peak of the integrated powers by consulting page 18 of the MIDO Consulting this value after synchronisation with the tariff meters one can immediately see if the plant has exceeded the maximum power that can be committed page 8 dossena 18 THD Total harmonic distortion percent The instrument performs an analysis of the harmonics content of current and voltage measurement signals and permits display of the total harmonic distortion THD compared with the fundamental present at a given instant on the line at pages 19 and 20 of the MIDO The value indicated by the instrument is the percentage weight of the harmonics on the fundamental the 50 or 60 Hz of the line The instrument is sensitive up to the 31st harmonic between even and odd order harmonics Furthermore if the instrument is equipped with a serial communication port it can be interrogated with a specific protocol function from a PC to obtain the content of specific harmonics For a description of the protocol see the specific document If the circulating current of the system is too low to permit correct calculation of the THD a flashing indicator point will appear on the display page 19 Hour counter The MIDO has an hour counter function page 21 of the MIDO Specifically when the instrument is switched on the count of hours of operation starts The count is interrupted only if there is no power supply to the instrument but resumes when power returns without lo
12. ee eee erect ee reer eee eer eres 2 As Safety precautii cisec seckssesckcz0vss desea seed eevee E EE E stato ted hs S 2 5 Auxiliary power SUPPLY secrecions non niian E CeT EAE E E R e S EE EEE ANSE REEE EA E EA E Ei 2 6 Voltage measurement inputs 0 eee ececeteseteseseseeseseeeececeesesesenenssssenenenassseaesesesesesesesesesececseaeseseseassesenseseseasasaeaeseseseseneenenenenaes 2 Ze C rrent measurement INPUTS 5 cccic5e5 ccsseuseseaceistcecweade se cteeecencpvubs canseusddecseadssacce scanessdbabdessasuacsnnesedsevasedapsubabs EE EEEE En SaR O e 2 8 Table Of Product CodeS greer eiee EEEa rE EE E EEEE SEE EEEE EEEE REKER EEEa EEN RESER E dh USsashonsiadenatedaneeesbubteg 2 Os DiSPlay Pagesa sess cerca S E A S 3 10 Three phase wiring GiAQGrarm e ce eccccceccsesesesesesesescscecscseseseseseseseseseseseseseseceescaesesensnsssnessussseseseseaeseaeseseseeeeeceeeeenseseaeaeaeeeeeees 3 11 Single phase wiring diagram eecececcccesessseseseseseseeesesesesenenesesenenensseseseseseseseseseseseseseceeseaeaesesssesenenensseseaeaeseaeaeaeeessaeeeenenenseees 4 12 Insertion Methods aisean andadi ea Giada nist naan Ries lace ieee aaa 4 13 Instrument power supply wiring GIAGFAM cece ee eseseseseseecsescesesesesesesescseseseseseseseseecsesesenenesesenenseseseataeseaceeeeeenetseeeeees 5 14 Configuration of the INStruMEN siscicteescctecweeetsrnedsesdeds aes Aeetsssatiieonrie E e E EE n AE EE Ea aE 5 14 1 Setting the VT ratini e
13. eorr E E E reereeee ere eee rere eaer eerie 7 17 Average power in the integration time 0 2 ceceseseseseceseseseseseseseseseeseseeceeeceesenesenesenensnenencsaeseseaeacseaceeseseeececeeeeeesesenenenenenes 7 18 THD Total harmonic distortion Percent ce cccesccccscscssssesesececscssssesesececsesssssesecescsessssssesececscsesscsesesecsesescseeeecscseees 8 19 HOUP COUNTED 0 eee E E E E 8 20 Tempera UE a a E A E EE OE ET ennubeed sstenset EAE ETTE AEE A 8 21 Autoscroll er epee eee ere eg eee ee eee ee rn ea reer reee erreee 8 22 Classes of precision and uncertainty occ ceccccccsesssssseseseceseseseseseseseseseseseseseseceescsesesensnenanensseseaeseseaeacseseseseceeeceesesesenenenentees 8 23 Functioning of optional equipment for MIDO C D E F only c ceceseseseseseseseseseseseseseeeeeesesescececeesesesenenenencneesnsnseataeaeaees 9 23 1 Code 1 option Local alarm relays Option 0 0 0 ccc ccssssesesscecscssssesesececsesesssesesescsesssscsesececsesssscsesesecsesesacsesececsenesaeaees 9 23 2 Code 2 option Remotely controllable relay Option ceesesesesesesssesesessseesesesesescecececsesesenenesensnesnscseseseseaeeeeteeeeeeeeeeees 9 23 3 Code 3 option Digital output OPTIONS cc ecccccccscssssesesscecsessssesesececssssssssesesessesssssesecessesssassesesecsesescaesesecseseaeaees 9 23 4 Code 4 option Digital input option 0 cccccscscsesesessecscsessssesesesscsessssesesesscsessssesesesecsesasscsesecsesesac
14. hrough proper configuration of an alarm it is possible to operate a relay on the exceeding of a settable threshold on one of the main electrical quantities To configure an alarm proceed as follows Enter the SETUP menu go to the page of the alarm to be set The display to select the quantity to be monitored the three phase current gt I is proposed as default will appear If for example one wants to set Alarm 1 select the page with the writing TYPE ALARM 1 2I To change the quantity press the A and W keys In this way the list of quantities on which one can set an alarm can be scrolled The following quantities are on the list gt I gt V gt PF SW gt Var VA After selecting one of the quantities and confirming with the ENTER key go to the next page to set the value at which the relay is activated The first time that page is accessed the display will show VAL ALARM 1 100 2I To change the threshold value press the A and YW keys and to confirm the value press ENTER On completion of the alarm setup hold the ENTER key down for at least 3 seconds to save the settings made and exit from the SETUP menu The wiring diagram is shown below i Modular Built in 123 45 67 8 7 22 23 24 25 26 27 28 29 amp 62646 Oe ae 6 66 6 e s ial Wed Le Ileal L I L I L I L A A A A i A A A A L L L L L L L L L L L L L L L L 1 2 3 4 1 2 3 4 aS at 23 2 Code 2 option Remotely controllable relay option
15. ing energy power has certainly been connected Switch the wires on the secondary of the amperometric transformer to make correct measurements Do not invert on the MIDO terminal board The MIDO displays incorrect current and or voltage measurements Check on the configuration menu that the multiplication constants are correctly entered The MIDO does not communicate by serial Check that the wires are correctly fitted into the terminals and that these have been tightened The wires have been well inserted and the terminal screws tightened but the MIDO still does not communicate Check on the configuration menu that the serial communication parameters have been correctly entered When the MIDO is switched on no writing appears on the display Reset the instrument switching it off and then on again dossena page 12 26 CONTENTS User IMMA eal ech assets Cee eects Nahe ce ies Seite Mee cevueet e catteu tet E E A E ches tect eteutectetusessts 0 MIDO MEASUREMENT APPARATUS cccccccssssssessseseseseseseseseseseseseseseseseseseseacsesenenessnesanesasasseacsescacseseseseseseseceeseseaenensaeaeseeeenecetecseeeas 0 1 Technical characteristics ccececccccccssssessssssssesesesesceceesesesesenenenesenenensssesesesesesesesesesesesesesceesesesesensaesesensnsseseaeaeacaeaeaeeeeeeeeceseeeeeeaes 0 2 DIMENSIONS aree A tcts iets ch sasbbants teoes ots tac e a eascwseies 0 3 1110010 che 0 eee ct eee ee e
16. ive power SW gt Var page 16 of the MIDO Currents in lines I1 I2 I3 page 17 of the MIDO Average active and reactive power in the Integration time WTI VarTI page 18 of the MIDO Temperature MaxTemp page 22 of the MIDO On the display pages the symbol is present at the top left to indicate that the values shown are peak values They represent the peaks reached by the quantities from the moment when the apparatus is put into operation or from the moment when a manual reset has been performed The peak values can be zeroed from the setup menu 17 Average power in the integration time The MIDO can calculate the average active and reactive power in the last integration period page 14 of the MIDO This period of time can be set by the user At switch on the energy count starts automatically thus not synchronised with the supplier s energy meter if any If the MIDO version purchased is equipped with the specific digital input it can be synchronised with the meter by connecting one of the contacts of fascia of the GMC or GME tariff meters to the input terminal At the end of the integration time this value will be memorised so that it can be displayed during the whole of the subsequent integration period It is always possible to realise the time that has passed since the beginning of the period thanks to the display on the same page of the number of seconds that have passed As a further instrument of analysis it is always possible to se
17. make it possible to insert the value for any KTA and KTV present upstream of the tariff meters Digital KTA 1 The default value for both constants is 1 To change the value press the A and W keys Press ENTER to confirm or SETUP to cancel Follow the same procedure to configure the next page where the KTV constant can be set The MIDO can be equipped with 2 digital input options In that case the fascia contacts of the tariff meters can also be connected to the MIDO and it is possible to synchronise calculation of the average integrated quantities in the Integration Time with these meters see paragraph 16 Average powers in the integration time The wiring diagram is shown below Modular Built in 1 2 3 4 5 6 7 8 i 22 23 24 25 26 27 28 29 CYC OCY OC VO VC VO YOY PSN NOC ONG NC NO OD NaN JAJ N DNS NAN AA N NLU Ne A Xe E AIN AAAA DD IN GND IN GND IN GND IN GND i IN GND IN GND IN GND IN GND ACTIVE REACTIVE FASCIA CONTACTS ACTIVE REACTIVE FASCIA CONTACTS SYNC SYNC 23 5 Code 5 option memorisation of load curves and interruptions options The instrument equipped with this option is equipped internally with a non volatile memory module Part of the memory is dedicated to recording the average integrated powers thanks to which it is possible to get back to the load curves and part is dedicated to recording long and short duration interruptions Specifically every time the integration time operates the following are mem
18. oltage of 600 Vac phase phase without damage to themselves over 440 Vac use voltage measurement transformers For the connections follow the diagrams included in this manual respecting the cyclical order of the phases When using transformers respect their input and output polarity 7 Current measurement inputs The instruments accept input currents of up to 6A from amperometric measurement transformers The connections must be made in conformity with the insertion diagrams respecting the cyclical order of the phases and the input and output polarities of the amperometric transformers It is possible to make a direct connection without use of the amperometric transformer since these inputs are isolated from the rest of the circuit It is important to ensure that the current value does not exceed that stated in this manual Note short circuit the secondary of the amperometric transformers before disconnecting the amperometric inputs 8 Table of product codes Code Product Built in 96x96 Modular 6 DIN Serial RS232 Serial RS485 9MIDOA MIDO A 9MIDOB MIDO B 9MIDOC MIDO C e 9MIDOD MIDO D e 9MIDOE MIDO E 9MIDOF MIDO F e List of options available only for MIDO C D E F Code Option Code MIDO 1 Code MIDO 2 Code MIDO 3 Code MIDO 4 Code MIDO 5 Code MIDO 6 Code MIDO 7 Description For 2 local alarm relays Add the Code 1 e g MIDO C1
19. orised with the corresponding time and date e Average active power on the integration time e Average reactive power on the integration time e Average apparent power on the integration time dossena And each time voltage is absent on one phase because of an interruption in the energy supply service the instrument memorises e Interruption start date e Interruption restoration date e State of the system during the interruption the phases on which voltage was missing Management of the writing is ring form so that if the free space in the memory is exhausted the oldest data are overwritten by the newest The user is therefore advised to download the memory through the specific software with the proper frequency so as to avoid losing data The speed with which the memory is filled depends on the integration time set Typically with an integration time of 15 the memory will fill in about 80 days For other integration times use the following formula to calculate the time in which the memory will fill Filling time in days 5 6 x value for the integration time chosen page 11 Example if one wants calculation of the average quantities to be performed every 7 minutes TI 7 the memory filling time will be 5 6 x 7 39 days 23 6 Code 6 option 1 digital input 1 remote alarm relay option This option makes two operations possible e Synchronisation with tariff meters GMC GME if any for calculation of energy and average
20. ower supply wiring diagram Modular Built in Vaux 50 60 Hz Vaux 18192021 1819 2021 1234 1234 ey EY a BY 230Vac gt 115Vac 230Vac 115Vac 14 Configuration of the instrument Before using the MIDO it is essential to configure some parameters necessary for its correct functioning If the parameters of the application coincide with the default parameters the configuration stage can be avoided The parameters that can be set by the user are as the following e VT ratio AT ratio Transmission speed baud rate and node number for RS485 or RS232 optional serial communication Setting of integration time for average powers Password enable and modify Zeroing of energy meters Zeroing of peaks Zeroing of the counter for hours of operation To enter the configuration menu press and hold down the SETUP key for about 3 seconds The first line of the display contains the name identifying the parameter to be modified the second its value With the SETUP and ENTER keys one can scroll the various configuration menus in both directions Pressing the A and V keys the value can be increased or decreased On reaching the bottom of the scale the count restarts from the minimum value The increase or decrease is by unit for short moments of pressure on the keys Holding the A and VW keys down the increase speed rises progressively Press ENTER to save the modifications or SETUP to cancel the changes made Press ENTER again for about 3 seconds to exit config
21. power values by connection with 1 fascia contact e The operation of 1 relay by remote modbus command on serial for the possible disconnection of loads or other things See the protocol manual attached to this user manual or available directly from Dossena The wiring diagram is shown below Modular Built in 5 6 7 8 26 27 28 29 C gt CAN N CN CN CN CN oe Ze ae 4 es Kew h tua No Ne of ene ie IN GND ee IN GND RELAY FASCIA CONTACTS RELAY FASCIA CONTACTS SYNC SYNC 24 Standards complied with CEI EN 61326 1 A1 A2 A3 IEC 61326 61326 1 A1 A2 CEI EN 60529 CEI EN 61010 1 IEC 61010 1 IEC 60529 NOTE If the device is installed near equipment that generates electromagnetic fields at radiofrequencies exceeding 3 V m there may be a 10 reading error for the maximum current with 10 V m 25 Appendix Fault diagnostics Causes and remedies The MIDO does not switch on when the power is connected Check that the wires are correctly fitted into the terminals and that these have been tightened The MIDO does not display the current and or voltage Check that the wires are correctly fitted into the terminals measurements and that these have been tightened The MIDO always displays the same initial page and does not Check that the power supply voltage is correct and within start the range stated in this manual The MIDO displays negative active power although a load that is absorb
22. ransmission speed and the node number for serial communication The following instructions are identical for RS232 and for RS485 e Configuration of serial speed enter the page for BAUD RATE and select the desired speed using the A and V keys to move between the standard values 2400 4800 9600 19200 e Configuration of node number enter the page for node number setting and select the desired node number The highest number that can be entered is 247 The default values are 19200 baud for speed and 1 for the node number dossena page 6 14 3 1 RS232 Serial communication MIDO D F In the versions equipped with an RS232 serial communication port the MIDO can be connected to a PC equipped with a serial port and interrogated through modbus protocol For the addresses of the quantities available on serial see the document describing the protocol annexed to this user manual or request it directly from Dossena The wiring diagram is shown below ae n cae OOO COO Viv gt vv Rx Tx S Rx Tx G N N D D 14 3 2 RS485 Serial communication MIDO C E In the versions equipped with an RS485 serial communication port it is possible to connect up to 247 MIDOS in a network of instruments which connected to a remote PC with a serial port and RS485 RS232 converter can be interrogated through modbus protocol For the addresses of the quantities available on serial see the document describing the protocol annexed to this user manual
23. seeececsesesaeaees 10 23 5 Code 5 option memorisation of load curves and interruptions Options cece cee cseseseteneeeeeseceseseseseseseseseeeeees 10 23 6 Code 6 option 1 digital input 1 remote alarm relay option c ce ccccscscsesseseececscsessesesececsesessesesececseseseesees 11 24 Standards comphed With sc csedcsc cssesachaeeedeesagecandarint eden subeaacasescdatesabeasueadea sagabieneh ide debhananbeedeesatelandad eetatuneadaseeleesseatone 11 25 ApPDENdIX aossen aea r E E E A E E E E E 11 26 CONTENT Serriero a a E R E a a a A 12 Rev 0 MU1087 30 03 07
24. sing the number of hours counted previously The hour counter can be zeroed from the specific page in SETUP 20 Temperature The temperature in the instrument and the maximum temperature reached can be displayed at any moment page 22 of the MIDO The maximum value can be zeroed from the SETUP menu under the heading Reset MAX 21 Autoscroll To enable or disable the autoscroll function press the A and SETUP keys together In default the instrument once autoscroll has been enabled displays all the pages in order at regular 3 second intervals To select or deselect the pages to be displayed in autoscroll perform the following operations 1 Press and hold down the ENTER key to make the following message appear on the second line of the page concerned Vile b Vizla Vlr del mp AuUtiosicrol YE S 2 To change YES to NO and vice versa press the W key move to the next page and if appropriate repeat the operations from point 2 with the pages to be enabled or disabled The selection of pages in autoscroll can be changed even during functioning of that option 22 Classes of precision and uncertainty Parameters Range Precision Uncertainty Voltage 10V 440V 0 5 1 digit Current 100 mA 5A 0 5 1 digit Frequency 45 65 Hz 0 05 1 digit For the calculated measurements the error depends on that of the primary measurements If amperometric or voltage
25. transformers are inserted one must take account of their precision to evaluate the error of precision in the primary measurements The measurements are displayed with an automatic scale change and mobile decimal point so that there are always 3 significant figures On the first line before the name of each quantity an indication appears that shows whether the measurement is in multiples or submultiples of the unit Example if all three currents measured are at 0 487 amperes the display shows mI mI2 mI3 487 487 487 The possible indications before the names of quantities and their meaning are as follows e m milli 1000 K kilo x1 000 M Mega x1 000 000 G Giga x1 000 000 000 T Tera x1 000 000 000 000 The exception is the number of hours which are shown as a whole number without commas with a maximum of 5 digits dossena page 9 23 Functioning of optional equipment for MIDO C D E F only Note for any optional configurations not described in the following document contact the Dossena head office directly 23 1 Code 1 option Local alarm relays option The MIDO can be equipped with a maximum of 2 alarm relay options Each option acquired manages 2 normally open relays When the MIDO is equipped with 2 alarm relay options it can therefore operate up to a maximum of 4 normally open relays The functioning and configuration of Alarm 1 are explained below the others are configured and function in the same way T
26. uration saving the parameters set and return to normal operation otherwise press the SETUP key for about 3 seconds to exit configuration without saving the parameters and return to normal operation when the keys remain inactive for about 15 seconds the instrument automatically exits the configuration menu without saving the parameters 14 1 Setting the VT ratio This menu makes it possible to set the value of the voltmeter transducers connected upstream of the signal inputs If the voltage inputs are direct without transducers this value must be 1 default Vice versa indicate the ratio between the primary and secondary voltage of the VT normally 100V The maximum value that can be set is 1000 which corresponds to a maximum voltage upstream of the transducer of 100 kV Example if the voltmeter transducers used are 30000 100 set the MIDO VT value at 300 14 2 Setting the AT ratio This menu makes it possible to set the value of the amperometer transducers connected upstream of the signal inputs If the current inputs are direct without AT this value must be 1 default Vice versa indicate the ratio between the primary current and the secondary current of the AT normally 5 A The maximum value that can be set is 2000 which corresponds to a maximum current upstream of the AT of 10 kA Example if the AT used are 1000 5 set the instrument AT value at 200 14 3 Configuration of the serial output MIDO C D E F It is possible to set the t
27. y meters which are displayed on pages 11 12 and 13 of the MIDO enter the SETUP menu and use the SETUP or ENTER keys to get to the page where the following text is displayed RESET ENERGY Reset NO Press the A or W keys to get YES to appear in the second line of the display RESET ENERGY Reset YES Press ENTER to make the zeroing effective or SETUP to cancel it If the procedure has been performed correctly the message below will appear on the second line of the display for 1 second Cleared Azzerata At the same time the energy count will restart from zero 14 7 Summary of default parameters VT ratio 1 Serial Speed 19200 baud Integration time 15 AT ratio Password not enabled Node number 1 15 Energy The MIDO is equipped with 6 energy meters to satisfy control and monitoring requirements even in Combined Heat and Power systems Specifically the instrument increases the meters of Plant that CONSUMES energy Plant that GENERATES energy Active energy Wh p 11 of the MIDO Active energy Wh p 11 of the MIDO Inductive energy VarhL p 12 of the MIDO Inductive energy VarhL p 12 of the MIDO Capacitive energy VarhC p 13 of the MIDO Capacitive energy VarhC p 13 of the MIDO 16 Peak values The MIDO can memorise the peak values of the following measurements e Three phase voltage and current gt V gt I page 15 of the MIDO Three phase active and react
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