15
Universal Energy Meter MEg40
+
Current inputs of the instrument MEg40
+
shall be always connected indirectly to
secondary circuits of the measuring current transformers through xed or exible wires
with the cross-section of 3 mm
2
with double insulation. It is recommended to connect
them through a terminal block with the possibility to short-circuit secondary currents
of the measuring current transformers. e secondary current of the measuring current
transformer of the phase L1 is brought to the input terminal I1K of the instrument
MEg40+ and goes out from its output terminal I1L. e secondary current of the
measuring current transformer of the phase L2 is brought to the input terminal I2K
of the instrument MEg40
+
and goes out from its output terminal I2L. e secondary
current of the measuring current transformer of the phase L3 is brought to the input
terminal I3K of the instrument MEg40
+
and goes out from its output terminal I3L.
e current circuits inside the instrument MEg40
+
are not galvanically connected, the
maximum allowable voltage between the current circuits is 50 V.
When it is measured in LV and MV networks, where measuring current transformers are
not installed, measuring split core instrument transformers PTD can be used to measure
currents - made according to the pat. No. 286255, with the rated current from 100 A to
900 A and a window size of 68 × 68 mm. en the universal energy meter is in the version
MEg40
+
/S1.
When it is measured in a LV network, the voltage of 230 V is not allowed to be connected
to the current terminals of the instrument in the version MEg40
+
. Direct current
measurement is impossible.
e supply network voltage 230 V / 50 Hz or uninterruptible voltage 230 V / 50 Hz is
applied to the terminals Network 230 V of the instrument; the position of the phase and
central conductor is unimportant. It is also recommended to install a protection element.
After all of the measuring and supply circuits are connected, it is possible to check them
for correct connection by activating the function Check of wiring, which is described in
the previous chapter.
e instrument MEg40
+
can be delivered with the inserted 16 MB memory card. In
this case, it is not allowed to take out or handle the memory card during installation.
erefore the card is covered with a sticker by the manufacturer, which shall be removed
after the measurements are programmed. If the instrument MEg40
+
is not delivered
with the memory card, the card slot is covered with a plastic cover. e memory card is
described in a separate chapter.
Warning!
When the instrument MEg40
+
is used in a dierent way than it is specied
by the manufacturer, the protection provided by the instrument MEg40
+
can
be impaired.
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