Hager ECR310D Three-phase energy meter

Use cases

• Monitor total active energy consumption and production on a live cloud dashboard for your customer.
• Track per-phase active power to detect load imbalances across L1, L2, and L3.
• Create an alert when the power factor drops below a defined threshold for more than 10 minutes.
• Log reactive energy values over time to advise customers on power factor correction.
• Compare consumed and produced energy counters to verify solar PV self-consumption ratios.
• Export historical apparent power data for energy audit reports.

Installation

1. 1Wire the Hager ECR310D to the ModbusCloud gateway (MCG or MLP series) using a shielded RS-485 twisted pair cable, connecting A, B, and GND terminals.
2. 2Set the Modbus RTU slave address on the ECR310D using the meter's front panel buttons, and note the address for gateway configuration.
3. 3Verify the baud rate and parity settings on the meter match the gateway configuration (check the Hager documentation for factory defaults).
4. 4Power on the gateway, open the ModbusCloud platform, and import the Hager ECR310D template from the template library.
5. 5Assign the correct Modbus slave address in the gateway configuration so it matches the address set on the physical meter.
6. 6Confirm that all 11 registers return valid data on the ModbusCloud dashboard before closing the distribution board.

Things to watch for

01

What baud rate and parity settings does the ECR310D use by default?

Check the Hager ECR310D installation manual for factory default communication settings. Common defaults for Hager meters are 9600 baud, 8 data bits, 1 stop bit, and no parity, but this can vary by firmware version. Make sure the gateway serial port matches exactly.

02

Why do I see zero or incorrect values for active power registers?

Active power and reactive power registers are int32 (two consecutive 16-bit registers). Ensure the gateway is configured to read 32-bit integers with the correct byte order. A wrong word swap will produce zero or wildly incorrect values.

03

Can I use this template over Modbus TCP instead of RTU?

The ECR310D communicates natively over Modbus RTU via RS-485. If your gateway supports RTU-to-TCP bridging, the template will still work because the register map is identical. The gateway handles the protocol conversion automatically.

04

Register addresses start at 45073. Do I need to subtract an offset?

Some Modbus implementations use a one-based addressing convention while others use zero-based. If your readings are empty, try subtracting 1 from each register address in the gateway configuration. The template is pre-configured with the correct offsets for ModbusCloud gateways.

Registers (11)

11 read / 0 write

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