Let’s use the previous example as a start for this energymeter installation example. But now there is also a small office building connected to the same grid. In the previous example there was no need for an energy meter, although it is recommended to still utilize one. In the following example the utilization of an energy meter is essential.
The energy meter always needs to be installed as close to the fuse-panel as possible. This allows you to configure a grid in Edge which is protected using the energy meter as input. The energy meter should use the Modbus-RTU protocol which means that the meter is connected via a twisted pair. There should be a 120Ohm termination resistor at the Modbus meter. Edge already has a termination resistor built in.
Supported Energymeters
Currently Edge supports the following MODBUS energy meters. Edge also has support for MODBUS-TCP energymeters using a MODBUS-TCP gateway. If your preferred energy meter is not listed you can contact support to do a request to support.
| Meter | Type | Interface | Max current | Can be ordered at LMS |
|---|---|---|---|---|
| EASTRON_SDM630 | Direct | Modbus-RTU* | 100A | Yes |
| EASTRON SDM630_CT | CT | Modbus-RTU* | 400A | Yes |
| ABB_B23** | Direct | Modbus-RTU* | 65A | No |
| ABB_B24** | CT | Modbus-RTU* | Configurable | No |
| INEPRO_PRO380 | Direct/CT | Modbus-RTU* | Configurable | No |
| EEM_350_D_MCB | Direct | Modbus-RTU* | 65A | No |
| EEM_MA3XX | Rogowski/CT | Modbus-RTU/Modbus-TCP | Configurable | No |
* Can be upgaded to modbus TCP using a modbus tcp converter
** The ABB B2X_112 (steel) does not support 3-phase bidirectional current mesaurement. Order a bronze (ABB B2X_212 ) if the installation involves a PV-installation
Reference schematics
This first schematic is a complete installation where the energy meter is installed on a din rail next To the Edge. This installation requires you to temporarily cut the power from the grid in order to install the energy meter.
This schematic shows how a CT energy meter can be used to measure the current. Although it is still recommended to cut the power from the grid, it is possible to install this meter while the power remains on.
Visual Reference
The Following image shows the basic setup of an energy meter to Edge. Note that the Edge is connected to the network using Ethernet, powered by 12v and has a twisted pair to a Modbus energy meter. The twisted pair is terminated at the energy meter using a 120Ohm termination resistor. See the next image for an illustration.
