Rayleigh Instruments RI-ENERGYFLOW-MODULAR Series User Manual page 28

3.3 External CT or Meter with CT
In order for the system to work correctly, a load sensing current transformer MUST be installed. Alternatively,
an external Modbus meter may be used. Meter installation and current transformer installation is described
below. Only one option may be used.
Current Transformer
The current transformer must be connected to the inverter using the supplied 4 way CT/Meter connector.
The White wire (S1+) must be connected to pole 1 of the connector. The Black wire (S2-) must be wired to pole 2.
External Meter Option
An RI-D18-CT-16-100 external Modbus meter can be connected to the inverter using the supplied 4 way CT/Meter
connector. The RX(+) must be connected to pole 3 of the connector. The TX(-) must be connected to pole 4.
CT/ Meter Wiring Connections:
Pin
1
2
In both cases, (CT or Meter option), the sensing current transformer must be installed as shown below. The arrow
on the transformer must
load or it will not work correctly
PV PV Inverter
PV
LAN
Monitoring
Device
Connection
Description
CT positive electrode
CT negative pole
point towards the incoming utility meter.
Grid Meter
CT
Normal Loads
Backup Loads
Pin
3
4
The inverter must be able to see 100% of the
Grid
Description
Meter Modbus RX (+)
Meter Modbus TX (-)
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