Ct Wiring; Connecting Data Communication Cables To Inverters - Fronius Smart Meter 240V-3 UL Instructions De Service

Install the CTs around the conductor to be measured and connect the CT leads to the
Fronius Smart Meter. Always turn off power before disconnecting any live conductors.
Put the line conductors through the CTs as shown in the previous section.
CTs are directional. If they are mounted backwards or with their white and black wires
swapped the measured power will be negative. The status LEDs indicate negative meas-
ured power by flashing red.
Split-core CTs can be opened for installation around the conductor. A nylon cable tie may
be secured around the CT to prevent inadvertent opening.

CT Wiring

The current transformers connect to the six position black screw terminal block. Connect
the white and black CT wires to the Fronius Smart Meter terminals marked CT L1, CT L2
and CT L3. Excess length may be trimmed from the wires if desired. Connect each CT
with the white wire aligned with the white dot on the label and the black wire aligned with
the black dot. Note the order in which the phases are connected, as the line voltage
phases must match the current phases for accurate power measurement.
Connecting data Fronius SnapINveter:
communication Connect the data communication ports of the Fronius Smart Meter to the Fronius system
cables to invert- monitoring in the inverter. Several Smart Meters can be installed in the system, see
ers chapter
Fronius GEN24 inverter:
Connect the data communication ports of the Fronius Smart Meter to the Modbus inter-
face of the Fronius GEN24 inverter. Several Smart Meters can be installed in the system,
see chapter
14
Multi meter system - Fronius SnapINverter
Multi meter system - Fronius GEN24 inverter
on page 20
Connect D- to D-.
1
Connect D+ to D+.
2
Connect - to -.
3
on page 21