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Mega MEg40+ Manual

Universal energy meter
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Universal Energy Meter
MEg40
+
MEgA – Měřící Energetické Aparáty, a.s.
MEgA – Měřící Energetické Aparáty, a.s.
664 31 Česká 390
664 31 Česká 390
Czech Republic
Czech Republic

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Summary of Contents for Mega MEg40+

  • Page 1 Universal Energy Meter MEg40 MEgA – Měřící Energetické Aparáty, a.s. MEgA – Měřící Energetické Aparáty, a.s. 664 31 Česká 390 664 31 Česká 390 Czech Republic Czech Republic...
  • Page 3 Universal Energy Meter MEg40 Universal energy meter MEg40 1/ PUrPosE and dEscriPtion The universal energy meter MEg40+ works as an energy meter and a monitor at the same time. In the function of the energy meter, it has a set of six energy registers for each phase. In the function of the monitor, it records long-term voltage, current and power curves and according to the voltage quality standard ČSN EN 50160 ed.
  • Page 4 Měřící Energetické Aparáty 2/ tEchnical ParaMEtErs Reference conditions: U = 230 V / 50,0 Hz supply ambient temperature = 20 °C, relative humidity = 40 % to 70 %. Measured voltages and currents have a frequency identical with U and make supply a three-phase system.
  • Page 5 Universal Energy Meter MEg40 Frequency range of phase lock loop: 47.4 Hz to 52.9 Hz Input impedance in 230 V range: 1.8 MΩ in 57.7 V range: 0.9 MΩ Maximum input phase voltage in 230 V range: 295 V in 57.7 V range: 150 V Maximum voltage on current inputs at I in 5 A range:...

  • Page 6: Electromagnetic Compatibility

    Měřící Energetické Aparáty Construction Dimensions body: 90 × 90 × 90 mm frame: 95 × 95 mm Weight: 0.6 kg Terminal block: max Ø of wires 3.0 mm Panel attachment: 2 pcs of removable eccentrics Operating data Working temperature: -25 °C to +55 °C Storage temperature: -25 °C to +85 °C Relative humidity:...

  • Page 7: 3/ Function Description

    Universal Energy Meter MEg40 3/ FUnction dEscriPtion Compared with the original universal monitor MEg40, the universal energy meter MEg40 offers extended functions to measure electrical energy. When measuring energies, it stores measured values into non-destructive registers and allows also additional creation of tariff bands and load profiles, without limitation of their number and time.
  • Page 8 Měřící Energetické Aparáty The display of the instrument MEg40 shows total registers for the three-phase outlet. The set of six registers for the individual phases are read by the user program. The phase energy measurement is unimportant when it is measured in compensated MV networks (MVL).
  • Page 9 Universal Energy Meter MEg40 5-minute intervals and for up to 30 events during every 6 hr 45 min, the minimum time of measurement is 573.6 days. Then both 10-minute voltage quality evaluations and 15-minute energy evaluations can be made from 5-minute intervals. The organisation of the internal data memory of MEg40 and the memory card can be circular or linear.
  • Page 10 Měřící Energetické Aparáty The user software evaluates maximums for selected recording intervals on the individual phases and also for the whole outlet for the recording interval and 1/4hr maximums. Besides, daily diagrams of average currents are determined for any selected day. The basic version of the instrument MEg40 has a bidirectional serial communication USB 2.0.
  • Page 11 Universal Energy Meter MEg40 1 minute. Then the rotation of the registry values is restored. The rotation can be restored using the button Start. When the button Menu is enabled, the item Energy meter and the item Monitor appear. By turning to the item Energy meter (inverse display) and pressing the button Select, you display the items Displ.
  • Page 12 Měřící Energetické Aparáty When the item Outlet is selected, all three voltages, three currents and three phases or active powers are displayed simultaneously, or the total active power of the outlet. By selecting the item Interval you can select the repeat interval to display new values in seven steps from 0.2 sec to 12.8 sec.
  • Page 13 Universal Energy Meter MEg40 When you select the item Instrument parameters, the instrument MEg40 displays the basic information about the instrument, i.e. serial number, control program version - FW, date and time of the internal clock and capacity of the Flash data memory of the instrument.
  • Page 14 Měřící Energetické Aparáty The Current connection function checks currents for correct flow through individual circuits of the instrument MEg40 and for correct direction, which must be in phase with the voltage corresponding to the voltage input. The allowable phase shift is ± 80°. If no current flows through the current input or its direction is turned relative to the voltage, then the message Current connection error and active powers of the individual phases will be displayed.
  • Page 15 Universal Energy Meter MEg40 Current inputs of the instrument MEg40 shall be always connected indirectly to secondary circuits of the measuring current transformers through fixed or flexible wires with the cross-section of 3 mm with double insulation. It is recommended to connect them through a terminal block with the possibility to short-circuit secondary currents of the measuring current transformers.
  • Page 16 Měřící Energetické Aparáty 5.1 installation of the instrument with the serial communication rs485, rs232 The universal energy meter MEg40 can be installed also into networks with commu- nication interface RS485 or RS232. The required communication interfaces must be specified in the order. The modulation rate of the communication interfaces RS485 and RS232 is 115.2 kBd.

  • Page 17: 7/ Maintenance Instructions

    Universal Energy Meter MEg40 Thus, the data reading time can be significantly reduced, however the new measured data will be saved into a new data file after the data transfer is completed. After communication is finished with interruption of measurement, the new measurement must be programmed.
  • Page 18 Měřící Energetické Aparáty • certificate of guarantee and delivery note, • CD with the basic user program and manual.. Optional available accessories: -PC / 1.8 m or 5 m, • communication cable MEg40 • 16 MB memory card, • reader of 8 memory cards, •...
  • Page 19 A changed or forgotten password can be read out only using the user program MEg40 12/ ManUFactUrEr MEgA – Měřící Energetické Aparáty, a.s., 664 31 Česká 390, Czech Republic, tel: +420 545 214 988 • mail: mega@e-mega.cz • web: http://www.e-mega.cz...
  • Page 20 Měřící Energetické Aparáty Fig. 2: Wiring of the instrument MEg40 in LV network without uninterruptible power supply type MBS ASK 51.4 type WTL 6/3 STB type WTL 6/3 STB SI SI SI SI SI SI SI SI SI SI SI SI connection terminal WKS 1/2 OPV 10/3 PV 10 6A gG...
  • Page 21 Universal Energy Meter MEg40 Fig. 4: Dimensions of the instrument unit MEG40    Profile 96 x 96 mm / body 90.5 x 90.5 mm Hole in front panel 92 x 92mm Fig 5: Rear panel of the instrument MEg40 MEg40 S USB MEg40 S ROZHRANÍM left: version with USB 2.0 communication...
  • Page 22 Měřící Energetické Aparáty Fig. 6: Function of the control panel of the universal energy meter MEg40 Menu Electricity meter Cycle Interval Higher Measuring instrument Checking resolution display type consumption +delivery Paramete Parameters of display measureme Consumption Delivery Type Interval Manner Level Quantity 200ms...
  • Page 23 Universal Energy Meter MEg40 Monitor Recorder the connection Maximum values of currents ers of voltage Parameters of current Instrument ent (password) measurement (password) parameters I prim I sec Serial number Version of FW 1A,5A,S1,S2,S3 Voltage Unom Date and time Memory capacity 1A,5A,10A,12.5A 15A,20A,25A,30A Phase...
  • Page 24 Měřící Energetické Aparáty accessories of the universal instrument MEg40 16 MB memory card and memory card reader...
  • Page 25 16MB memory card and memory card reader 1/ PUrPosE and UsE Easy, on time, personnel and technical means undemanding collection of data measured by the instrument MEg40 is allowed by a special 16 MB memory card with Flash memory and a reader for eight memory cards. The use of the 16MB memory card allows you to record U of all three phases and store energies in the set of six registers with the recording interval of 5 min, register 30 voltage events and record extreme currents in each interval...
  • Page 26 Měřící Energetické Aparáty In the circular recording mode, measured data are permanently recorded only into the memory card and the oldest data pages are overwritten. The measurement is ended after the measurement is ended from PC. 2.3 Data transmission from the instrument MEg40 with memory card The data transmission from the instrument MEg40 equipped with the memory card to...
  • Page 27 The data measured during the time when the card was not inserted will be lost. 3/ ManUFactUrEr MEgA – Měřící Energetické Aparáty, a.s. 664 31 Česká 390, Czech Republic tel: +420 545 214 988 • mail: mega@e-mega.cz • web: http://www.e-mega.cz...
  • Page 28 Měřící Energetické Aparáty Uninterruptible power supply MEg102 1/ PUrPosE The uninterruptible power supply MEg102 serves for short-term power supply of the instrument MEg40 in case of supply voltage interruptions or drops. In accordance with ČSN EN 61000-4-30 ed. 2, its use is necessary for registration of short-term voltage events up to 3 min.
  • Page 29 Uninterruptible power supply MEg102 are galvanically isolated by transformers, they are to be connected to the power supply unit using screw-on terminals. There is a button on the outside of the plastic cover to stop the battery operation. The principle of the uninterruptible power supply MEg102 is represented by the group diagram in Fig.

  • Page 30: 4/ Installation Instructions

    Měřící Energetické Aparáty 3/ tEchnical ParaMEtErs Input voltage: = 230 V / 50 Hz inp nom Maximum input voltage: 253 V Change to battery operation: = 180 V Return to network operation: = 195 V Output voltage: 170 V , rectangular course, mark-to-space ratio 1:4 in both polarities, ≈...
  • Page 31 10 years of operation as recommended by the manufacturer and then the power supply unit checked for correct operation. 6/ ManUFactUrEr MEgA – Měřící Energetické Aparáty, a.s. 664 31 Česká 390, Czech Republic tel: +420 545 214 988 • mail: mega@e-mega.cz • web: http://www.e-mega.cz...
  • Page 32 Měřící Energetické Aparáty UsBhost / rs485 converter 1/ PUrPosE The USBhost / RS485 converter is designed to connect a USB slave unit to the RS485 serial line. The USBhost / RS485 converter allows you to connect the instrument MEg40 with the USB interface to the RS485 serial bus.
  • Page 33 USBhost / RS485 converter 3/ constrUction The USBhost/RS485 converter according to Fig. 1 with the panel Fig. 2 is installed in a plastic box designed for spaces with the maximum voltage of 50 V . There is a 1 m long USB cable with USB B (M) connector running out from the left side.
  • Page 34 Měřící Energetické Aparáty Fig. 1: USBhost/RS485 converter in version for MEg40 and MEg202.2 USB host / RS485 Fig. 2: Detail of type plate of USBhost/RS485 converter konvertor +12V and communication unit MEg202.2 USB host / RS485 konvertor +12V...
  • Page 35 USBhost / RS485 converter Fig. 3: Interconnection of USBhost/RS485 converter and instrument MEg40 and communication unit MEg202.2 Universal Energy Meter MEg40 communication unit GPRS MEg202.2 CHAN1 CHAN2 1 2 3 4 5 6 7 8 +12V USB host/RS485 +12V USB slave USB host/RS485...
  • Page 36 Měřící Energetické Aparáty appendix no. 1 Methodology of measurement using the monitor MEg40 Appendix made by prof. Ing. Vladislav Matyáš, CSc. We understand it not only as a universal definition of algorithms of the universal monitors of MEg40+ series but also as a generally valid description of digital measurements.
  • Page 37 Měřící Energetické Aparáty A similar relation as for voltages applies to currents. From the instantaneous current values i(k) with the serial numbers k = 0, 1, 2, …, K – 1, the RMS current value is calculated according to the formula −...
  • Page 38 Měřící Energetické Aparáty As well, powers are evaluated in each of the measuring time intervals T . The following formula is applied to compute the active power: − ( ) ( ) ∑ where K = 320. From the values u (k) and i (k), the active power P in phase 1 is obtained,...
  • Page 39 Měřící Energetické Aparáty ∑ (7a) The average effective value is sometimes used instead of the RMS value. ∑ (7b) and U are almost the same. In addition to Under normal circumstances, the values U the total (or average) RMS value, for each value in the range of the recording interval between the values U(l), the minimum and maximum values are searched These data are obtained for each voltage.
  • Page 40 Měřící Energetické Aparáty From the active power values P(l) found out in the individual measuring time intervals with the serial numbers l = 1, 2, … L, the average active power is obtained for each of the recording intervals T ∑...
  • Page 41 Měřící Energetické Aparáty disPlay and EvalUation Using a PErsonal coMPUtEr The data obtained during operation of the monitor and stored in its memory for further use are transmitted into a personal computer. The simplest operations with the transmitted data include statements. For each of the detected events, place (phase), type, size, time duration and time of occurrence is specified.
  • Page 42 Měřící Energetické Aparáty Similar formulas apply to the idle power. The active energy transmitted during the time T (20) and the reactive energy similarly. Data from the time interval T , can be displayed depending on time and evaluated statistically. It is also possible to use more times T for aggregation, with a different position and duration.
  • Page 43 Měřící Energetické Aparáty...
  • Page 44 Universal Energy Meter MEg40 MEgA – Měřící Energetické Aparáty, a.s. 664 31 Česká 390 Czech Republic www.e-mega.cz Edition: 03/2014...