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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:

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:

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:

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

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

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