Mx37y_Technical_Description_ENG_v2.00.doc
5
─ Single- and three-phase electronic meters with built-in DLC
modem, GSM/GPRS modem or RS485 comm. interface
Fig. 1: MT371 meter with ZO3 plug-in switching device
Mx37y meters properties:
• Active energy and demand meter
Accuracy class 1 or 2
• Reactive energy meter
Accuracy class 2 or 3
• Apparent energy meter
• Modes of energy measurement and
registration (single-phase meters)
For one-way energy flow direction
For two-way energy flow direction
For two-way energy flow direction but
registered in one (absolute) register
• Modes of energy measurement and
registration (three-phase meters)
For one-way energy flow direction, three-phase
energy is algebraic sum of energies registered
in each of the phases – meters are equipped
with an electronic reverse running stop
For two-way energy flow direction, three-
phase energy is algebraic sum of energies
registered in each of the phases
For one-way energy flow direction, three-
phase energy is sum of absolute values of
energies registered in each of the phases
• Meter connection to network
The three-phase meter can function as a single-
phase or a two-phase meter
• Meter quality:
Due to high accuracy and long-term stability
of metering elements no meter re-calibration
over its life is required
High meter reliability
High immunity to EMC
• Additional meter functions:
Current measurement in a neutral conductor
via the fourth measuring system:
Detection of missing/broken neutral conductor
Detection of phase and voltage unbalance
Measurement and registration of under- and
over-voltage
Generation of alarms and their transmitting
via the DLC modem and low voltage network
(“alarm pull” at Mx371 – the concentrator
reads Alarm ON status and Alarm OFF status
register from the meter) or via GSM/GPRS
modem or the RS485 communication
interface (“alarm push” at Mx372 – GSM
modem constantly reads Alarm ON status
and Alarm OFF status register from the meter
and, if any alarm is active and enabled, it
tries to notify the centre about the alarm)
• Time-of-use registration (up to 4 tariffs):
Tariffs change-over; internal real-time clock
• Load-profile recorder:
Two load-profile recorders (i.e. daily and
hourly values)
• Communication channels:
Infrared optical port in compliance with the
IEC 62056-21 for local meter programming
and data downloading
Built-in DLC modem (Mx371)
GSM/GPRS modem (Mx372) or
Built-in RS485 comm. interface (Mx372)
Built-in M-Bus comm. interface (option)
• LCD:
In compliance with the VDEW specification
• Data display modes:
Automatic cyclic data display with display
time of 10 sec.
Manual data display mode (by pressing the
Scroll push-button)
• Indicators:
on LCD:
- Presence of phase voltages L1, L2, L3
- Phase currents flow direction
- Actual tariff indication
- Status of switching device
- Meter status and alarms
- 3-state GSM signal level indicator (Mx372)
LED1: Imp / kWh
LED2: Imp / kVArh
• Communication protocols:
Optical port: IEC 62056 – 21, mode C or
DLMS (in compliance with IEC 62056 – 46)
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