# Industrial meter (A1 port only)

> Connect a Fluvius industrial meter to the Voltmasters EMS controller through its A1 port, for medium and high voltage installations.

Source: https://voltmasters.io/en/docs/device-integrations/energy-meters/fluvius/industrial-meter-a1-port-only/

### Industrial meter (A1) installation guide

This guide applies **only to installations using an industrial meter connected via the A1 port**, typically found in medium- or high-voltage systems.

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### Step 1: Physical connection

Connect the industrial meter to the Controller using the designated **A1 interface** as specified by the meter manufacturer.

-   Verify that the A1 wiring is correctly terminated
-   Ensure polarity and phase order are respected
-   Confirm the Controller is powered on before configuration

* * *

### Step 2: Add the A1 meter to the system

When registering a new A1 meter in the system, you will be prompted to configure **scaling factors**. These parameters are critical for accurate measurements and must match the transformer ratios used in the installation.

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### Step 3: Configure scaling factors

Industrial meters measure secondary values from transformers. The system converts these into real-world values using scaling factors.

**Voltage Scaling Factor**

-   Represents the ratio of the **voltage transformer (TP)**
-   Default value: **110.0 V**
-   Adjust only if a voltage transformer is present
-   **Example**  
    If the installation uses a **15400 V / 110 V** Voltage transformer, the correct voltage scaling factor is:

```
15400 ÷ 110 = 140
```

**Current Scaling Factor**

-   Represents the ratio of the **current transformer (TI)**
-   Default value: **5.0 A**
-   **Example**  
    If the installation uses a **100 A / 5 A** current transformer, the correct current scaling factor is:

```
100 ÷ 5 = 20
```

**Total scaling factor**

-   Represents the ratio of the current and voltage transformers together.
    
-   **Example**  
    If the installation uses a **140 (TP) x 20 (TI)** transformer, the correct total scaling factor is:
    
    ```
    140 x 20 = 7000
    ```
    

* * *

![Label on a Fluvius industrial meter with the CT ratio 250/5 A times 50 and the VT ratio 15400/110 V times 140 written on by hand, and the resulting billing factor.](https://voltmasters.io/assets/docs/image-63.webp)

### Step 4: Verification

After configuration, verify correct operation:

-   Check that voltage, current, and power values are displayed
-   Compare readings against known reference values or utility data
-   Confirm phase balance and direction of power flow

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### Troubleshooting

| Issue | Likely Cause & Resolution |
| --- | --- |
| No data from meter | Incorrect A1 wiring or communication settings; verify connections and meter protocol |
| Values too high or too low | Scaling factors do not match TP/TI ratios; recheck transformer specifications |
| Negative or reversed power | Phase order or TI polarity is incorrect; verify installation wiring |
| No Voltage displayed | Some older meters (DSMR 2.2) or specific brands (Landis+Gyr) do not send voltage data. This is a limitation of the meter itself, not the controller. |
| Unstable readings | Loose connections or incorrect grounding; inspect wiring and shielding |

* * *

### Notes for installers

-   Always document CT/PT ratios