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Energy Meter Manual

2. Installation and configuration

In this section:

2.1. AC wiring

2.1.1. Configuration options

The configuration option of either Grid Meter, PV Inverter, Generator or AC Meter is set in the GX device. For details on GX device configuration see the GX device configuration chapter. This selection will effect how the system should be wired and how the information received from the meter is displayed on the screen.

See below diagrams for the different wiring options:

ET340_AC_Wiring_Grid_Meter.svg

3-phase wiring

Note

When used to measure a PV Inverter, terminals 1, 2 and 3 should face the PV inverter to ensure correct direction of current and power.

2.1.2. System examples

Example diagram

In this diagram, a single ET340 is used to both measure the grid and a single phase PV Inverter.

ET340_AC_Wiring_Grid_single_phase_PV.svg

Single ET340 measures the Grid and a single phase PV Inverter

On the GX device go to the grid meter in the Wired AC sensor settings. Make sure 'Phase type' is set to 'Single phase' and 'PV inverter on phase 2' is enabled.

2.2. Connection to a GX device

2.2.1. Wired connection to a GX device

Connect the ET340 to the GX device using the RS485 to USB interface.

The RS485 to USB interface cable between the GX device and the Energy Meter can be extended up to 100 meters; make sure that the extensions of the Data+ (orange) and Data- (yellow) wires form a twisted pair.

The table below shows the colors of the wires and their connection to the terminals of the ET340, as well as the colors to be used for a CAT5 extension cable.

RS485 to USB

RS485 Signal

ET340 terminal number

Suggested wire color CAT5 extension cable

Orange

Data +

8

Orange

Yellow

Data -

9

Orange/White

Black

GND

10

Brown

The red, green and brown wire coming out of the RS485 to USB cable are not used. Cut them off or bend them back and isolate them.

ET340_RS485_USB_GX.svg

ET340 wired connection to a Cerbo GX using the RS485 to USB interface

Note

You can attach an RJ45 plug that can be plugged into the front of one of the two RJ45 sockets of the energy meter and has the same pin assignment.

To ensure signal integrity and robust operation, particularly ensure that:

  • The extension cabling complies with the minimum cross-sectional area specifications in the RS485 to USB interface data sheet.

  • The extension cabling has appropriate shielding and twisted pair cores.

  • The original cable attached to the Victron RS485 USB interface is reduced to a maximum length of 20cm for installations where the total cable length exceeds 10m or where installation/site specific interference occurs - in this case, a suitable/quality cable should be used for the entire cable length and not only for the extension length.

  • Cabling is installed separated/away from the main DC or AC power cabling.

  • All wiring is properly terminated (including unused wires) and properly isolated from weather/water ingress.

  • RS485 networks are traditionally terminated at both ends with 120Ω terminators. This is not required if the cable length is short and you are using the Victron supplied RS485 to USB lengths, but may be required if the cable length is modified.

  • For detailed wiring/installation notes and specifications refer to the Victron RS485 to USB interface cable ‘Datasheet’.

2.2.2. Zigbee connection to a GX device

The ET340 can also be wirelessly connected to a GX device via our Zigbee to USB converter & Zigbee to RS485.

The Zigbee to USB converter is connected to the GX device and the Zigbee to RS485 converter is connected to the ET340.

  1. Connect the Zigbee to USB converter to the GX device using the supplied USB cable.

    A few seconds after connecting, the active LED should be on and the TX/RX LED should be blinking (the converter takes its power from the GX device, so the GX device needs to be switched on as well).

  2. Connect the Zigbee to RS485 converter to the ET340 energy meter according to the table below:

    Zigbee to RS485

    ET340 terminal number

    Color

    GND

    10

    Black

    A

    8

    Orange

    B

    9

    Yellow

    In case you have several Zigbee devices installed, make sure only one Zigbee device is powered up right now: the Zigbee to USB converter connected to the GX device. Power down all others. If you don't do this, the Zigbee to RS485 converter may be connected permanently to another Zigbee device.

  3. Connect the 12V DC power supply to the Zigbee to RS485 converter. When the power is switched on, check the LEDs again.

ET340_RS485_Zigbee_GX.svg

Energy Meter wireless Zigbee connection to a Cerbo GX

Note on old and new Zigbee converters

Please note that there is a new Zigbee converter available now, that is not backwards compatible with the old converters. See table below for old versus new part numbers. If you have a non compatible set, please ask your supplier for a correct version.

old/new

Victron part number

Zigbee to RS485 converter part number

old

ASS300400100

DRF2619C

old

ASS300400100

DRF2618A

new

ASS300420100

DRF2659C

new

ASS300420200

DRF2658C

Note on GX firmware versions

For the new type Zigbee converters, Venus OS v2.54 is the minimum required software version.

2.3. GX device configuration

After proper connection and powering up, the meter(s) will be visible on the GX device in the Settings → Energy meters menu:

Energy_Meters_GX_settings_ET112_2.png

Single Energy Meter in the Energy meters menu

Energy_Meters_GX_settings_multiple_devices.png

Two Energy Meters in the Energy meters menu

After selecting an Energy Meter, you have to set the Role and Phase type. Press the space bar or right click to get to the Phase type and Role menu:

Energy_Meters_GX_settings_ET112_1.png

For the ET112 only Single phase option is displayed

Energy_Meters_GX_settings_phase_numbers.png

Depending on the application, the role is set here

Select either Role or Phase type and press the space bar to make changes:

Energy_Meters_GX_role2.png

Select the Role according to the application

Energy_Meters_GX_settings_phase_type.png

Selection menu for Single and Multi phase type

Single-phase, single function and single-phase, dual function mode setup:

EMXX_Single_Function.svg

Single-phase, single function

EMXX_Dual_Function.svg

Single-phase, dual function to measure grid on L1 and a PV Inverter on L2

After all settings have been made, the Energy Meter now appears with the relevant data in the device list of the GX device:

Energy_Meter_GX_device_list_2.png

Energy meter set to measure AC loads on the AC output of the inverter/charger

Energy_Meters_GX_device_list.png

Or configured to measure energy consumption from the grid

Right-click or press the spacebar to get to the Energy Meter overview with all relevant data on energy consumption and its generation in all phases. At the bottom of the menu, the role of the Energy Meter can be set via the Setup menu. The data used for communication can be read out via the Device menu. You can also set up a custom name for the Energy Meter there:

Energy_Meters_GX_overview1_3_phase.png

Detailed overview page of a 3-phase Grid meter

Energy_Meters_GX_overview2_3_phase.png

Always be informed about all details, to the second

Energy_Meters_GX_device_settings.png

Custom name configuration

Energy_Meters_GX_role1.png

Quickly change roles

2.4. Multiple Energy Meters in one system

To connect multiple Energy Meters, wire each meter to a separate RS485 to USB interface, which are then each plugged into a separate USB socket on the GX device.

Connecting multiple meters to the same RS485 to USB interface cable is not possible.

Connecting multiple ET340 meters to the same RS485 to USB cable is not possible: the ET340 meter has no display and its modbus address can therefore not be changed.