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Device description
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– E650 Series 4 – ZMD400AT/CT, ZFD400AT/CT – User Manual
S4 represents the newest hardware generation.
The meter’s firmware version, which determines certain meter
characteristics, can be displayed on the LCD, e.g. as part of the rolling
display (depending on parameterisation) and can be read out in the
following two ways:
meter data readout (depending on parameterisation)
meter identification readout (see section 5.7 "Data readout")
Some executions of ZMD400CT/CR meters are available with accuracy
class 0.2 S. These meters fulfil the IEC accuracy class 0.2 S for active
energy and class 0.5 S for reactive energy. For details, see the
corresponding datasheet.
2.5
Block schematic diagram
This section provides an overview of the function of ZxD400xT meters
based on a block schematic diagram.
Figure 1. Block schematic diagram ZMD400xT
ZxD400AT active energy meters record the imported and exported active
energy consumption, while the ZxD400CT combimeters record the active
and reactive energy consumption in all four quadrants.
ZxD400xT 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
t
(3 fixed, plus up to 4 others on extension board) for:
Firmware version
Class 0.2 S
Inputs
