Handbuch-KnxSmartmeter-85A-en-3.odt, 2018-10-04
Seite 7 von 69
Assembly
Connection diagram
KNX
-
+
N V1 V2 V3
Voltage Inputs
Current Inputs
I1 I2 I3
Figure 1: Terminal connection diagram
ATTENTION DANGER!
Electrical shock on contact with live parts. Electrical shock can result in death.
Disconnect the mains before working on device and cover up live parts in the
vicinity!
The neutral conductor and the measurement inputs for the 3 voltage measurement channels V1,
V2 and V3 are connected to the overlying screw terminal. When measuring a three-phase
system the phases L1, L2 and L3 have to be connected to V1, V2 and V3. If the Smartmeter is
not in three-phase operation then the phase voltage of the corresponding current channel has to
be connected to voltage measurement channel V1, V2 and V3. For example, if three powers are
to measure at one single phase, then this phase has to be connected to all three channels V1,
V2 and V3. The supply for the voltage inputs may be made from any location downstream the
main fuse, since the voltage inputs are designed for over voltage category IV. Insulation and
electro-magnetic imunity is designed for overvoltage category 4. So, the voltage inputs need not
to be additionally fused.
The EIB/KNX bus is connected on the upper left, grey / red terminal. The Smartmeter is powered
solely by the KNX bus.
Optionally a ground can be connected to one of the three ground terminals. By a connected
grounding the measurement accuracy for very small currents and powers is increased. Thus,
when measuring the current, the measurement deviation is reduced by about 0.3mA or when
measuring the power the deviation is reduced by about 70mW. By connecting the grounding the
KNX bus is connected via a capacitance of 15nF to ground.
Enertex
®
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