3 Phase < 4000A¶

This setup measures three-phase supplies up to 4000 A. It has three parts:

the Carlo Gavazzi EM210 energy meter with Rogowski coils
the Arduino Opta data collection unit
the Blues Wireless for Opta cellular module (optional; see Arduino Opta cellular connectivity)

Power supply¶

The Opta and the Blues module must each be powered with 24 V DC.

The energy meter is powered from the mains supply it monitors. See the manual for the wiring for different numbers of phases.

Communication¶

The Opta and the Blues module connect through a built-in connector. Make sure the two units are firmly pushed together.

The energy meter and the Opta communicate over RS485. Wire it during installation according to the manual linked below. For the EM210 and Opta, connect A to B and B to A.

Rogowski coils¶

Wire each coil into the energy meter according to the diagram on the device. Then open each coil and place it around the phase it monitors.

Rogowski coils wired to the EM210 energy meter

Rogowski coils placed around the phases of a supply

Energy meter parameters¶

When the meter is installed and powered on, set these parameters:

Parameter	Value
SYS	3P
bAud	19,2
SEnSOr	roG

The manual explains how to navigate the menu and set parameters, under "Menu map" and "Parameter menus". The default password for the parameter menu is 0.

Documentation¶

Purchase¶

Energy meter, RS 2238048: https://uk.rs-online.com/web/p/energy-meters/2238048
Rogowski coils, RS 2224405: https://uk.rs-online.com/web/p/current-transformers/2224405