ISKRAEMECO MT174 Manual Download

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METER CONNECTION DIAGRAM

The meter connection diagram is stuck on the inner side of the terminal block cover or is printed on the
meter nameplate. The meters can be connected in three-phase four- or three-wire networks, as well as in a
single-phase two-wire network.

a. Connection diagrams of direct connected meters MT174

b. Connection diagram of CT operated meter MT174

Summary of Contents for MT174

Page 1: ...asses A and B as well as with the IEC 62053 21 and IEC 62052 11 international standards for electronic meters of active energy for classes 1 and 2 and optionally with the IEC 62053 23 international standard for electronic meters of reactive energy for classes 2 and 3 A built in time switch complies with the IEC 62054 21 and IEC 62052 21 standards It enables energy registration in up to four tariff...

Page 2: ...indirect pressure to the conductors the terminal screws do not damage it The current terminals make a reliable and durable contact regardless if the conductor is made of copper or aluminium Voltage metering elements are power supplied via potential links Sliding potential links are self braking and enable easy disconnection of current and voltage metering circuitry In the metering mode they should...

Page 3: ...ntial links under meter cover Terminal blocks of direct connected meters for Imax 85 A 1 2 3 1 Detector of terminal cover opening 2 Phase voltage test 3 Sliding potential links opened contacts contacts Potential links in the terminal block of direct connect meters for Imax 120A ...

Page 4: ...al block of a CT operated meter 4 1 3 2 1 Current terminals 3 Auxiliary terminals 2 Voltage terminals 4 Auxiliary voltage terminals for add on unit Auxiliary Terminals Up to six auxiliary terminals can be built in a terminal block They are used for tariff inputs impulse outputs or tariff outputs or RS485 interface Due to a limited number of auxiliary terminals all stated inputs and outputs as well...

Page 5: ...f the terminal block cover or is printed on the meter nameplate The meters can be connected in three phase four or three wire networks as well as in a single phase two wire network a Connection diagrams of direct connected meters MT174 b Connection diagram of CT operated meter MT174 ...

Page 6: ...mething is wrong with the meter In such a case the meter should be replaced 6 Check the L1 L2 and L3 indicators on the LCD if current conductors are connected correctly L1 L2 L3 indicators are displayed all three phase voltages are present Some of the L1 L2 L3 indicators are not displayed voltage in these phases is not present Check if current conductors of these phases are connected and or their ...

Page 7: ...r L1 L2 or L3 blinks and at the same time the arrow indicating export energy flow direction is displayed it indicates reverse energy flow through the metering element in that phase In the LCD bottom row there are eleven signal flags that indicate current valid tariff meter status and alarms The meaning of signal flags see item 2 5 3 is engraved on the meter name plate below them DATA DISPLAY Data ...

Page 8: ...ver opening detector is built into the meter 2 The flag is active only if an external magnetic field detector is built into the meter option 3 The flag could be implemented only at one direction energy flow and at absolute energy meters 4 The flag indicates that Li battery is low and should be replaced 5 The flag is active only if no power data displaying in the LCD was requested option 6 If the F...

Page 9: ...isplay data from the Manual sequence on request At the orange pushbutton the time duration of pressing does not influence to its function while at the blue pushbutton there are three different time durations of pressing each of them causing different effect a Short pressing shorter than 2 sec the next data in the menu is displayed b Long pressing longer than 2 sec and shorter than 5 sec a submenu ...

Page 10: ...ctive energy A total kWh 1 8 1 Positive active energy A in tariff T1 kWh 1 8 2 Positive active energy A in tariff T2 kWh 2 8 0 Negative active energy A total kWh 2 8 1 Negative active energy A in tariff T1 kWh 2 8 2 Negative active energy A in tariff T2 kWh Instantaneous power registers 21 7 0 Positive active instantaneous power A in phase L1 kW 41 7 0 Positive active instantaneous power A in phas...

Page 11: ... mos relay with a make contact that can changeover 25 W 100 mA 250 V on request In this case pulse transmission at a distance of 1 km is made possible The pulse constant is equal to one tenth of the meter constant and the standard pulse width is 100 ms However a smaller pulse constant or other pulse lengths can be set on request Optional pulse widths are 10 ms 20 ms 30 ms 40 ms 50 ms 60 ms 80 ms a...

Page 12: ...ated electromagnetic interference in the MHz range In a typical residential photovoltaic system a three phase electricity meter will be installed as shown on Fig 18 below This way it can measure the consumed electric energy and the energy delivered to the grid note a second single phase PV meter may be used to measure only the energy delivered by the solar panels Fig 18 A typical residential solar...

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