Apator Norax 3 Electricity Meter Installation Guide

Product Overview

The Apator Norax 3 electricity meter is a direct-connected, three-phase meter designed for household users. It measures active and reactive energy in four quadrants (import and export) on three-phase, four-wire electrical networks. The meter can also measure energy consumption and production for single-phase users.

1. Front View of Meter

The front of the meter features several key components:

• 1. NORAX 3: Model designation.
• 2. M-Bus: Communication interface.
• 3. DL MS: Data logging and measurement system indicators.
• 4. Optical Interface: For reading measurement data (EN 62056-21 / IEC-1107).
• 5. Ngenic Logo: Manufacturer branding.
• 6. Nameplate: Displays nominal parameters, accuracy class, and environmental markings.
• 7. Wiring Diagrams: Shows connections for main and RS485 communication terminals.
• 8. Manufacturer Information: Apator S.A. address.
• 9. Pulse Transmitter LEDs: For validation and accuracy verification.
• 10. Serial Number and Barcode: Unique identification.
• 11. Push Buttons: For navigating display content.
• 12. Sealable Push Button: For service menu access and clearing indicators.
• 13. Replaceable Battery Cover: Access to the internal battery.
• 14. Cage Clamp Terminal Block: For electrical connections.

2. Pushbuttons

Two accessible buttons on the front panel allow manual scrolling of data on the LCD. A third push button, protected by a sealable lid, is used to clear tamper indicators (terminal cover opening, magnetic influence) and to access the service menu.

Sealable Push Button Operation:

After opening the lid and pressing the button once, the meter enters the service menu. Navigation within the menu is done using the other two buttons. To reset tamper operations and clear influence signals, select "tAnPErSt" in the service menu and hold the sealable button for at least three seconds until "SUCCESS" appears. This operation requires the meter to be properly installed with the terminal cover secured and mains power connected.

3. Display

The LCD displays measurement data, including Active Imported Energy (OBIS code 1.8.0.), typically shown with 8 digits (7 whole, 1 decimal). The display can also show symbols indicating mains voltage connection (L1, L2, L3) and error status.

Display Symbols:

• Built-in element
• Current tariff
• Internal error
• Markers
• Optical data transmission
• OBIS Code
• Unit of displayed data (e.g., kWh)
• Main data exposition field

Displayed Measurement Data Examples (Default Automatic Sequence):

• 1.8.0. Active Imported Energy, sum over all phases

Displayed Measurement Data Examples (Manual Sequence):

• 8.8.8.8 Display test
• 96.1.0. Serial number
• 1.8.0. Active imported energy, sum over all phases
• 2.8.0. Active exported energy, sum over all phases
• 15.8.0. Sum of absolute value of active energy per phase
• 31.7.0. Instantaneous current, phase L1
• 32.7.0. Instantaneous voltage, phase L1
• 51.7.0. Instantaneous current, phase L2
• 52.7.0. Instantaneous voltage, phase L2
• 71.7.0. Instantaneous current, phase L1
• 72.7.0. Instantaneous voltage, phase L3
• F.F.9. LR Error Codes - Basic Error Registry
• F.F.O. NLR Error Codes - Extended Error Registry

Error Codes:

Errors are coded on the last 4 digits. Examples include:

• LR Firmware Errors: Terminal box cover removal, meter housing opening, magnetic field influence, low battery, measurement system error, incorrect phase sequence, critical data error, external memory error, NLR application validation error, NLR application error.
• NLR Firmware Errors: Uncertain clock setting, low battery voltage, counter memory error, measurement system error, communication module error (WM-Bus).

4. Operation, Activation, Deletion of Terminal Cover Opening Sensor

The meter has an automatic terminal cover opening sensor activated two minutes after connection to mains voltage and proper installation of the cover. Removal of the cover is indicated by a marker triangle below the "CZO" inscription on the display. The triangle is visible when the cover is open and not visible when closed.

After initial commissioning, all terminal cover removals are logged. If the cover is removed while active protection is on, an "exclamation mark in a triangle" symbol will appear, indicating an error.

To clear the terminal cover opening error, press the sealable button, navigate to "tAnPErSt", and hold the sealable button for three seconds until "SUCCESS" appears. This action also clears "RPM" markers related to magnetic influence attempts.

5. Terminal Block Housing, Connection

Connections must be made asymmetrically according to DIN standards and the provided wiring diagram. The meter uses cage clamp terminals suitable for multi-core copper wires without sleeves (if permitted by regulations). Recommended wire cross-section is 2.5 mm² to 35 mm², with a maximum tightening torque of 3 Nm for main terminal screws.

Meter Wiring Diagram:

A diagram illustrates the connections for phases L1, L2, L3, and Neutral (N) to terminal block numbers 1, 3, 4, 6, 7, 9, 10, and 12.

Correct connection displays L1, L2, L3 symbols. Missing phases result in the corresponding symbol not being displayed. Flashing "L" indicates reverse current direction, and flashing numbers indicate incorrect phase sequence.

6. Battery Replacement

The Norax meter has a built-in battery for the real-time clock and occasional display operation during power loss. If the "built-in battery" symbol appears on the display, the battery voltage is critically low. The battery (CR2032 or CR2450) is located behind the cover marked with number 13. Replacement can be done without disconnecting the meter from the mains.

7. Environmental Protection

Dispose of unusable devices as electronic waste in accordance with local regulations. A recycling symbol is shown.