Block Schematic Diagram - Landis+Gyr E650 Series User Manual

Device description
Firmware version
2.4

Block schematic diagram

Inputs
D000030108 en m – E650 Series 3 – ZMD300AT/CT – User Manual
The firmware version and firmware checksum stored in the meter can be
shown on the display or read out as IEC readout list, if parameterised
accordingly (see section 5.7 "Data readout"). Specific meter characteristics
are present or not depending on the firmware version.
This section provides an overview of the function of ZMD300xT meters
based on a block schematic diagram.
Figure 1. Block schematic diagram ZMD300xT
The ZMD300AT active energy meters record the imported and exported
active energy consumption, while the ZMD300CT combi-meters record the
active and reactive energy consumption in all four quadrants.
The ZMD300xT meters can be fitted with modular communication
interfaces in a communication unit, which can be exchanged or used in the
field as required.
The main meter inputs are:

Connections of phase voltages (U1, U2, U3), phase currents (I1, I2, I3)
and neutral conductor (N)
– For processing in the measuring system
– For the three-phase power supply to the meter and voltage monitor

Control inputs U
– Changeover of energy and demand tariff rates
– Resetting
– Demand inhibition
– Synchronising
Opto-couplers protect the internal circuitry from interference, which
could otherwise enter via the control inputs.

Buttons
– For display control (display buttons, optical interface)
– For resetting or service functions (reset button)
(3 fixed, plus up to 4 others on extension board) for:
t
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