Handbuch-KnxSmartmeter-85A-en-3.odt, 2018-10-04
Seite 8 von 69
The current sensors have to be connected to the lower terminals of the Smartmeter with the
following assignment:
•
I+ : brown
•
I- : white
•
Shield : black (drain wire)
Assembly of the current sensors
The current-carrying conductor, to be measured, must be passed through the current sensor. If
possible, the line should be passed vertically through the current sensor. Thus, the highest
precision is achieved in the current measurement. In order to fix the current sensor, it could be
fixed with a cable strap at the conductor. It is recommended for safety reasons to lead the
conductor with insulation through the current sensor.
10mm
46
m
m
39.7
mm
1
Figure 2: Dimensions of the 85A current sensor in mm
Safety note:
In the vicinity of label 1 of Figure 2 the current sensors cable is only single
insulated. At this point a savety distance of at least 5mm has to be adhered to all non insulated
live conductors. Similarly a safety distance of at least 10mm from the screw terminals has to be
adhered to all non insulated live conductors. However, the sheath of the line for the current
sensors has a reinforced insulation. Hereby no safety distances to the vicinity are required.
Since the current sensors are calibrated for each current channel it must be ensured that the
accompanying current sensors are connected to the corresponding channel. For this purpose a
corresponding marking of the channel is mounted on each current sensor. In addition, the
current sensors should be connected only to that Smartmeter, with which they were delivered.
To avoid any confusion, the serial number of the Smartmeter is attached to the line of a current
sensor. The serial number can also be recovered lateral of each Smartmeter.
A power count arrow (for positive power count direction) is attached by
P+
on the current
sensors. A power flow in this direction corresponds to a positive power value. Usually, the
current sensors are mounted so that the power count arrow shows from the energy source to
the energy consumers, so that an energy consumption has a positive impact for the balance
energy counter.
The lines to the current sensors should be laid according to EMC requirements. This is
especially important when a high accuracy for currents below 100mA (equivalent to 25W) is
required. Therefore the following recommendations are made:
•
The line should be laid in a minimum distance of 2cm to power lines.
Enertex
®
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