EARU Three Phase Four Wires Electronic Active Energy Meter

1. Úvod

This manual provides detailed instructions for the installation, operation, and maintenance of your EARU Three Phase Four Wires Electronic Active Energy Meter. These meters are designed for accurate measurement of active energy (kWh) in three-phase four-wire AC circuits. They are suitable for various applications requiring precise power consumption monitoring.

2. Bezpečnostní informace

• Instalaci a údržbu by měli provádět pouze kvalifikovaní elektrikáři.
• Před jakoukoli instalací nebo elektroinstalačními pracemi se ujistěte, že je napájení zcela odpojeno.
• Verify all connections are secure and correct according to the wiring diagrams to prevent damage to the meter or electrical system.
• Nepoužívejte měřič v prostředích, kde teplota nebo vlhkost překračuje jeho specifikovaný rozsah.
• The meter's circuit intervals can withstand impulse voltage with a waveform of 1.2/50uS, peak value 6KV, without electric arc or damage.
• All circuit insulating earthing can withstand AC voltage 2KV with actual sine wave 50Hz for 1 minute.

3. Obsah balení

Upon opening the package, please verify that you have received the following items:

• 1 x EARU Three Phase Four Wires Electronic Active Energy Meter (Specific model as ordered)
• 1 x Návod k obsluze (tento dokument)

4. Specifikace

Poznámka: In the column of Rated Current, the value before the bracket is demarcated current value Ib, and the value in the bracket is the maximum current Imax.

Figure 1: EA771 Dimensions and Detailed Specifications

5. Konec produktuview and Model Differences

The EARU Three Phase Four Wires Electronic Active Energy Meter series includes several models, each offering specific features. All models are designed for DIN rail installation and provide accurate energy measurement.

Obrázek 2: Přesview of different EARU Energy Meter models (EA771, EA770, EA770-C, EA777, EA772)

5.1 Porovnání vlastností modelu

Figure 3: Feature comparison across different EARU Energy Meter models.

5.2 Display Types

Some models feature different display types:

• LCD displej: Provides a clear digital readout of energy consumption (e.g., EA771, EA770, EA772, EA777).
• Counter Display: Features a mechanical counter for energy readings (e.g., EA770-C).

Obrázek 4: Přamples of LCD (EA770) and Counter (EA770-C) displays.

5.3 Energy Measurement

Models like EA777 and EA772 offer advanced measurement capabilities:

• Positive Active Electric Energy: Standard energy consumption measurement.
• Reverse Active Electric Energy: Measures energy flowing back into the grid, useful for systems with generation (e.g., solar).

Figure 5: EA777 displaying both positive and reverse active electric energy.

6. Nastavení a instalace

The energy meter is designed for 35mm DIN rail installation. Follow these steps carefully:

6.1 Fyzická instalace

1. Ensure the main power supply is OFF before beginning installation.
2. Mount the meter onto a standard 35mm DIN rail in your electrical panel. The meter features clips on the back for secure attachment.
3. Once mounted, ensure the meter is stable and does not wobble.

6.2 Schémata zapojení

Proper wiring is crucial for accurate measurement and safe operation. Refer to the specific wiring diagram for your meter model.

6.2.1 EA770 Wiring

Figure 6: EA770 Wiring Diagram. Connect L1, L2, L3, N for both input and output as shown.

6.2.2 EA770-C Wiring

Figure 7: EA770-C Wiring Diagram. Connect L1, L2, L3, N for both input and output as shown.

6.2.3 EA771 Wiring

The EA771 model supports two wiring configurations: Up IN Down Out or Up Out Down In.

Figure 8: EA771 Wiring Options: Up IN Down Out (left) and Up Out Down In (right). Connect A, B, C, N lines accordingly.

Figure 9: EA771 detailed view showing wiring terminals, LCD screen, and power/pulse indicators.

6.2.4 EA772 Wiring

The EA772 model also supports bi-directional wiring for energy flow.

Figure 10: EA772 Wiring Options. Note the P+ and P- terminals for pulse output and 485A/485B for communication.

Figure 11: EA772 detailed view showing wiring terminals, display, and indicators.

6.2.5 EA777 Wiring

Figure 12: EA777 Wiring Diagram with P1-/P1+ for pulse output and 485A/485B for RS485 communication.

Důležité: Always double-check all wiring connections before restoring power. Incorrect wiring can lead to equipment damage or electrical hazards.

7. Návod k obsluze

Once installed and powered on, the meter will begin measuring energy consumption. The display will show the accumulated kWh.

7.1 Odečítání údajů na displeji

• LCD/LED Display: The digital display shows the total active energy in kWh. Some models may cycle through other parameters like voltage, current, frequency, and power factor.
• Counter Display (e.g., EA770-C): The mechanical counter directly shows the accumulated kWh.

7.2 Indikátory

• Indikátory L1, L2, L3: These LEDs illuminate to indicate the presence of voltage v každé fázi.
• Impulse Indicator: This LED flashes proportionally to the energy being consumed. A faster flash rate indicates higher power consumption. (Constant Pulse: 400imp/kWh).

7.3 Advanced Features (EA772, EA777)

For models like EA772 and EA777, additional features are available:

• Parameter Cycling: Use the 'SET' or 'PRESS' button (if present) to cycle through various display parameters such as Active Power, Reactive Power, Frequency, Power Factor, Voltage, Current, and Baud Rate.
• Reset Power Consumption: The EA777 model includes a function to reset power consumption readings. Refer to the meter's specific buttons ('SET', 'PRESS') for this operation.

8. Údržba

The EARU energy meters are designed for long-term, maintenance-free operation under normal conditions.

• Čištění: Udržujte měřič čistý a bez prachu. K čištění používejte měkký, suchý hadřík. Nepoužívejte abrazivní čisticí prostředky ani rozpouštědla.
• Podmínky prostředí: Ensure the operating environment remains within the specified temperature and humidity ranges to prevent damage and ensure accurate readings.
• Inspekce: Periodically inspect the wiring terminals for any signs of loosening or corrosion. Tighten connections if necessary, ensuring power is off.

9. Řešení problémů

Pokud narazíte na problémy s měřičem energie, podívejte se na následující běžné problémy a jejich řešení:

• Žádný displej/Žádné napájení:
  • Zkontrolujte, zda je zapnutý hlavní zdroj napájení.
  • Verify all wiring connections (L1, L2, L3, N) are secure and correctly terminated.
  • Zajistěte jmenovitý objemtage odpovídá vašemu napájení.
• Incorrect Readings or No Impulse Flashing:
  • Confirm that the current and voltage connections are correct and in phase.
  • Ensure the load is connected properly.
  • Check for any loose wiring that might affect measurement accuracy.
• Communication Issues (for models with RS485):
  • Verify the RS485 A and B terminals are correctly connected to your communication device.
  • Check the baud rate settings on both the meter (if adjustable) and your communication device.

Tipy pro uživatele

• 100A Support: The meter is rated for 3 X 5(100)A, meaning it can support up to 100A. Ensure your wiring and circuit breakers are appropriately sized for 100A if you intend to draw that much current. Always consult with a qualified electrician for high current installations.

10. Záruka a podpora

EARU products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please contact your retailer or the official EARU support channels. Keep your purchase receipt as proof of purchase.