---
title: "Setup Eastron SDM630-MODBUS-MID-V2-3F/100A"
slug: "setup-eastron-sdm630-modbus-mid-v2-3f-100a"
updated: 2025-08-22T10:06:07Z
published: 2025-08-22T10:06:07Z
canonical: "docs.calculus.group/setup-eastron-sdm630-modbus-mid-v2-3f-100a"
---

> ## Documentation Index
> Fetch the complete documentation index at: https://docs.calculus.group/llms.txt
> Use this file to discover all available pages before exploring further.

# Setup Eastron SDM630-MODBUS-MID-V2-3F/100A

## Instructions

Check that the energy meter is correctly connected to the CT (current transformer) before setting up the energy meter.

- The white wire / S1 of the transformer must be connected to the + terminal of the energy meter.
- The black wire / S2 of the transformer must be connected to the – terminal of the energy meter.

> [!WARNING]
> Attention!
> 
> If connected incorrectly, there is a possibility that the current will be measured incorrectly. For example, when you connect the black wire to the positive terminal of the energy meter.
> 
> See also the following guide: [Manual Eastron energy meters](/v1/docs/en/manual-eastron-energy-meters)