Měřící Energetické Aparáty
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INFORMATION ON SW
PQ monitor MEg39 package includes a CD with user programs. Parameterization of
measurements, reading of measured data, displaying of direct measurements, including
an oscillographic recording, are carried out by the SW PQ program. Unied program
Data Viewer ensures displaying of measured data in graphic and tabular form of a data
le, export of measured data and printing tasks. Functions of the mentioned programs
are described in separate user manuals [1], [2]. e database based program WebDatOr,
supplied separately, is ready to take care of work with data les from one or more measu-
rement instruments, even of dierent types [3].
BASIC INFORMATION ON MONITOR MEg39
PQ monitor MEg39, Fig.1, is designed for xed mounting in LV, MV and HV networks.
e MEg39 unit is installed in a polycarbonate self-extinguishing box with the dimensi-
ons of 108 × 90 × 63 mm with the design for DIN rail mounting. e monitor is installed
under the switchgear box cover with a possibility of sealing to restrict access to the termi-
nals. e instrument panel can be sealed, too. Input terminals of measured voltages and
currents, power supply and communication lines are realized by means of screw termi-
nals for a wire diameter of up to 4 mm2. Measured voltages are led to the corresponding
terminals U1 (36), U2 (34), U3 (32), U4 (30) and N (28). e four yellow LEDs U1, U2,
U3 and U4 signalize by permanent light the presence of input voltages within preset
tolerances. If a measured voltage is beyond preset tolerances, the corresponding LED
ashes shortly, see the description of LED voltage indicators in Table 1. e unit panel
also contains a green LED indicator RUN, signalizing the operation of the MEg39 unit.
Measured currents are led to the pairs of terminals I1 (2,3), I2 (4,5) and I3 (6,7), I4 (8,9)
whilst the current input terminal is marked by a dot.
Supply voltage is connected to the terminals L (16) and N (18).
Two-value input signal is led to the IN (24,25) terminals, the 25 terminal is positive. e
output signal OUT (26,27) is realized by means of the relay contact.
e miniUSB connector located on the panel of the unit is designed for local commu-
nication. Remote communication is realized by means of the RS485 interfaces at the
terminals 22 and 23. Furthermore, it is possible to use the Ethernet interface, whose RJ45
connector is located at the panel of the unit and it enables using the functions provided
by the built-in webserver.
