4. Configuration & Monitoring
The VM-3P75CT is configured through VictronConnect.
When using the VE.Can connection, the VM-3P75CT will be automatically detected once connected to the VE.Can port and properly terminated. Ensure that the VE.Can profile of the GX device's VE.Can port, to which the VM-3P75CT is connected, is configured to 250 kbit/s
When using the Ethernet connection, the VM-3P75CT is automatically recognised by the GX device.
VictronConnect configuration and monitoring
There are two options to connect to the VM-3P75CT using VictronConnect from a mobile device, laptop or PC:
Direct via Ethernet using the Modbus/UDP connection in the local network
Or by using VictronConnect-Remote (VC-R) remotely via either VE.Can or Modbus/UDP (requires the GX device connected to the VRM Portal)
The VM-3P75CT supports Instant Readout of key data (total power and power per phase) at a glance directly from the Device list (1) in VictronConnect. This works via a local network connection and VictronConnect-Remote (VC-R).
The data display in VictronConnect is divided into a Status page (2), showing status messages for each phase, frequency, protective earth voltage, and neutral current, and an Energy page (3), providing an overview of the energy fed into and purchased for each phase.
Tapping on the cog wheel in the top right corner of the Status- or Energy page will take you to the Settings page, from where the network settings and the configuration of the meter are made.
The Settings menu (4) includes the following options:
Role: (8) Set this to Grid meter, PV inverter, Generator or AC load, depending on which appliances you want to measure.
Phase Configuration: (7) If the VM-3P75CT is installed single-phase, set it to Only L1. For a 3-phase installation, set it to 3-phase. For a split-phase installation set it to Split phase.
Energy registration method: (10) Default: Vector. Energy registration methods vary by country. Consult your energy supplier to confirm the method used in your region.
IP Configuration: (5) We recommend leaving this setting on Automatic (DHCP). Manual configuration (6) is only necessary in very rare cases. Contact your network administrator for the details.
Position: (9) If a PV inverter is selected as the role, the position must be adjusted depending on where it is connected in relation to the Multi/Quattro AC input or AC output.
LED pulse output: (10) The status LED can be used as an energy pulse signal to enable a visual diagnosis of possible loads at a glance. Each pulse corresponds to a specific amount of energy passing through the meter. Possible options are: Disabled, 10 Wh (default), 100 Wh and 1 kWh.
Once the Role has been properly set, the configuration is done.
GX device monitoring
After the VM-3P75CT has established a connection to the GX device in the local network, the device must be activated in the Modbus TCP/UDP menu so that it appears in the Device List.
Go to Settings → Modbus TCP/UDP devices → Discovered devices and enable the discovered energy meter; it's disabled by default when first installed and turned on.
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After activation, the energy meter will be displayed in the Device List.
Right-click on the device will take you to the device overview page on which the current data of the individual phases, the AC totals and the total energy per phase can be read out.
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An overview of the connection and hardware-specific data can be found on the Device page. There, you can also assign a custom name for the meter.
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4.1. LED codes
The VM-3P75CT has a built-in LED that shows the status of the energy meter.
The LED states are as follows:
Blinking fast alternately green/red: Bootloader/update mode.
Solid green: All ok, normal running mode.
Blinking green @ 1Hz (50% duty cycle): Identify unit. Stops after 60s.
Off for 3 seconds, on for another 10 seconds and off again while pressing the reset button for about 15 seconds: Reset to factory defaults.
Off and immediately on after pressing the reset button briefly: Restart the device.
Solid red: The LED will illuminate solid red if there is an error.
Short red pulse: Each pulse corresponds to a specific amount of energy passing through the meter. These pulses represent increments such as 0.01 kWh, 0.1 kWh, or 1 kWh.