# 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.

***

#### 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.

***

#### 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 an voltage transformers togher.
* **Example**\
  If the installation uses a **140 (TP)  x 20 (TI)** transformer, the correct total scaling factor is:

  ```
  140 x 20 = 7000
  ```

***

<figure><img src="/files/XT4A5c4NwKZDs8HMCOjz" alt=""><figcaption></figcaption></figure>

#### 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

***

#### 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                  |
| Unstable readings          | Loose connections or incorrect grounding; inspect wiring and shielding               |

***

#### Notes for Installers

* Always document CT/PT ratios&#x20;


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