(MT375) - Technical Description - Iskraemeco UK

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Mx37y ─ Single- and three-phase electronic meters with built-in DLCmodem, GSM/GPRS modem or RS485 comm. interfaceThe meter cover is made of transparentpolycarbonate. A nickel-plated iron ring in the righttop corner is utilized for attaching an optical probe tothe optical port. There is a lid which is fixed to themeter cover with a hinge. The lid covers the Resetpush-button and can be sealed in the closed position.A terminal block complies with the DIN 43857standard. It is made of high quality polycarbonateassuring resistance to high temperatures, voltagebreakdownand mechanical strength.Fig. 10: A terminal block of MT371 meter – bottom view1. Current terminals2. Auxiliary terminals53. Voltage terminals for anadd-on unit4. Detector of opening aterminal cover4Current terminal for currents up to 120 A with9.5 mm hole diameterCurrent terminal for CT meters for currents upto 6 A with 5.5 mm hole diameterThe meter can be equipped with max. four additionalvoltage terminals (item 3): 2 (L1), 5 (L2), 8 (L3), 11(N). They enable simple connection of additionalexternal devices.Up to 6 auxiliary terminals (item 2) can be fitted in theright side of the current terminals. They can beutilized for M-Bus and optomos relay impulse outputor optomos relay control output. Instead of theoptomos relay a 6 A bistable relay for load controlcan be built into the meter. All of them are fitted intothe meter regarding the customer request at meterordering.Versions:- two pulse outputs (A+, R+) and relay (6 A) +optomos (100 mA)- M-Bus and relay (6 A) + optomos (100 mA)Detectors (switches) of the terminal cover (item 4)and the meter cover opening (on the PCB next to theoptical port) are built into the meter.A sliding voltage bridge is intended for fast andsimple separation of meter current and voltage circuitused for calibration or accuracy testing. A specialslider is built in each phase of the connectionterminal. It can be shifted up and down with ascrewdriver.31Fig. 11: A terminal block of MT372 meter – bottom view1. Current terminals4. Detector of opening aterminal cover2. Auxiliary terminals 5. Auxiliary terminals –inputs, outputs, SIM3. Additional voltagecard bed, alarmterminalsinputs, etc.Current terminals (item 1) are made of zinc-platediron and have only one screw. A universal clampingterminal assures the same quality of the contactirrespective of the shape of the connection conductor(a compact wire, a stranded wire, greater or smallercross-sections). It also assures faster meterassembly. Available current terminals are:Current terminal according to DIN standard forcurrents up to 85 A with 8.5 mm hole diameter2Position 0Position 1Sliding voltage bridgeAuxiliary terminalsFig. 12a: A terminal block – sliding voltage bridge andauxiliary terminalsWhen a voltage bridge is in “0” position, it means thatthe voltage part is separated from the current part.During the meter testing and calibration the slidingvoltage bridges should be in position “0”.12Mx37y_Technical_Description_ENG_v2.00.doc
Mx37y ─ Single- and three-phase electronic meters with built-in DLCmodem, GSM/GPRS modem or RS485 comm. interfaceWhen a voltage bridge is in position “1”, the voltagepart is not separated from the current part. During thenormal meter operation the potential links should beclosed (position “1”). Upon request, the potential linkscan be built under the meter cover.1 Double cage clamp2 Auxiliary terminalsFig. 12b: A terminal block with auxiliary terminalsMT37y : 3x230/400 V, 10(120) AFig. 14: Details of a terminal block for RS485 meter1 Auxiliary terminals2 Terminal cover sealing screwFig. 12c: A terminal block with auxiliary terminalsMT37y CT : 3x230/400 V, 5(6) A121. RS485 comm.interface2. Current terminals 7. M-Bus3. Sliding voltage bridge4. A switch for detectionof terminal coveropening5. Additional voltageterminals6. Outputs for load control8. Output for switchingdevice control9. Alarm input (low voltage)The terminal cover can be long or short. The meterconnection diagram is stuck on the internal side ofthe terminal cover.Fig. 13: Details of a terminal block for GSM/GPRS meter1. Coupling circuit forexternal antenna6. Additional voltageterminals2. SIM card bed 7. Outputs for load control3. Current terminals 8. M-Bus4. A sliding voltage bridge5. A switch for detection ofterminal cover opening9. Output for switchingdevice control10. Alarm input (lowvoltage)Mx37y_Technical_Description_ENG_v2.00.doc 13
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(MT375) - Technical Description - Iskraemeco UK

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