Device Description; Field Of Application; Characteristics - Landis+Gyr E650 Series User Manual

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Device description

2.1

Field of application

2.2

Characteristics

© Landis+Gyr
This section provides you with a brief overview of the design and function of
the E650 ZMD300AT/CT meters.
ZMD300xT meters can be used for direct connection at the low voltage
level. They are primarily used by medium consumers.
ZMD300xT meters have a comprehensive tariff structure. This extends
from seasonal tariffs to multiple energy and demand tariff rates.
The ZMD300CT combi-meters record active and reactive energy
consumption, the ZMD300AT active energy meters only the active energy
in three-phase four-wire networks on low voltage, and from this determine
the required electrical measured quantities. They are connected directly to
the phase conductors at the measuring point.
The data determined are displayed (LCD) and are also available at the
optical interface for data acquisition, with an appropriate communication
unit also as required via CS, RS232, RS485, PSTN modem, GSM modem,
etc. When equipped with transmitting contacts, the meters can also be
used as transmitting meters for telemetering. The tariff rates can be
controlled internally or externally.
With a communication unit, the meters can also be used for recording
counter pulses for other physical media (e.g. water or gas volumes).
ZMD300xT meters have the following basic characteristics:

Recording of active, reactive and apparent energy in all four quadrants
(ZMD300CT) or recording of imported and exported active energy
(ZxD 300AT)

Tariff system with energy and demand tariff rates, stored values, load
profiles, etc.

Extended functions such as monitoring functions, sliding maximum
demand, etc. (for ZMD300CT additionally power factor cosφ)

Tariff control
– External
- via control inputs (ZMD300xT21 and ZMD300xT41)
- via communication interfaces using formatted commands
– Internal
- by integral time switch (ZMD300xT24 and ZMD300xT44)
- by event signals based on monitored values, such as voltage,
current demand, etc.

Display of data on a liquid crystal display (LCD)

Active and reactive power per phase and true RMS values of voltages
and currents by means of digital signal processing (DSP) chips

Accuracy: Compliance with IEC class 1 and with MID accuracy class B
for active energy consumption (ZMD310xT) and IEC class 1 for
reactive energy (ZMD310CT).
D000030108 en m – E650 Series 3 – ZMD300AT/CT – User Manual
Device description