1. Introduction and Overview
The EARU DDS661 Single Phase Digital Energy Meter is designed for measuring active energy consumption in single-phase AC power systems. This compact, Din Rail mountable device provides accurate readings of various electrical parameters, including kilowatt-hours (kWh), voltage, current, power, power factor, and frequency. It features an LCD backlight display for clear visibility and offers data retention during power outages. Models are available with and without RS485 (Modbus-RTU) communication capabilities for advanced monitoring.
Video: Product overview, assembly, and display demonstration.
2. Safety Information
- Installation and maintenance should only be performed by qualified personnel.
- Ensure the power supply is disconnected before any installation, wiring, or maintenance work to prevent electric shock.
- Verify that the voltage and current ratings of the meter match your electrical system specifications.
- Do not operate the meter in environments exceeding its specified operating temperature and humidity ranges.
- Avoid exposing the meter to direct sunlight, rain, or excessive dust.
- Ensure all wiring connections are secure and properly insulated.
3. Product Features
- LCD Backlight Display: Clear and easy-to-read display of electrical parameters.
- Multi-parameter Measurement: Measures Positive Power Consumption, Reverse Power Consumption, Total Power, Instantaneous Power, Power Factor, Frequency, Voltage, and Current.
- High Accuracy: Achieves First Level Accuracy for reliable measurements.
- Data Retention: Meter readings are saved and not zeroed out in the event of a power failure, preventing data measurement errors.
- Din Rail Installation: Standard 35MM Din Rail mounting for easy integration into distribution boxes.
- Optional RS485 Communication: Available with Modbus-RTU protocol for remote data acquisition and system integration.
- Durable Construction: Made from ABS material, certified with CE and IP51 rating for dust and water protection.
- Forward and Reverse Measurement: Capable of measuring energy flow in both directions.
Image: Illustrating the meter's first-level accuracy.
Image: Demonstrating data retention after a power outage.
4. Specifications
Image: Detailed dimensions and key product parameters.
| Parameter | Value |
|---|---|
| Model Number | DDS661 |
| Brand Name | EARU |
| Dimensions (L*W*H) | 117mm * 18mm * 65mm |
| Phase | Single Phase |
| Accuracy Class | 1.0 |
| Rated Voltage | AC230V 50Hz/60Hz, AC110V 60Hz |
| Operating Voltage Range | 161-300VAC |
| Maximum Rated Current | 60A |
| Operating Current Range | 60A |
| AC Withstand Voltage | 2KV for 1 minute |
| Overcurrent Withstand | 960A for 0.01s |
| Internal Power Consumption | <2W/10VA |
| Constant Pulse | 1000imp / kWh |
| Display Type | LCD |
| Operating Temperature | -10℃ to +50℃ |
| Storage Temperature | -30°C to +70°C |
| Operating Humidity | ≤75% |
| Storage Humidity | ≤95% |
| Material | ABS |
| Certification | CE |
| IP Rating | IP51 |
| Battery Included | No |
| High-concerned chemical | None |
5. Installation and Wiring
The DDS661 energy meter is designed for 35MM standard Din Rail installation. Ensure the mounting location is dry, well-ventilated, and free from strong electromagnetic interference. Professional installation is highly recommended.
5.1 Mounting
- Attach the meter to a standard 35MM Din Rail in your electrical distribution box.
- Ensure it is securely clipped into place.
Image: Example of DDS661 installed on a 35MM Din Rail.
5.2 Wiring Diagram
Refer to the wiring diagram below for correct connection. Pay close attention to the input (IN) and output (OUT) terminals for Live (L) and Neutral (N) wires. For models with RS485, ensure the RS485+ (24) and RS485- (23) terminals are connected correctly for communication.
Image: Wiring diagram for DDS661, showing L/N input/output, pulse output, and RS485 connections.
- Terminals (1) and (4): Input for Live (L) and Neutral (N) respectively.
- Terminals (3) and (6): Output for Live (L) and Neutral (N) respectively.
- Terminals (20) and (21): Pulse output contact for external pulse counting.
- Terminals (24) and (23): RS485+ and RS485- for Modbus-RTU communication (only on RS485 models).
Ensure all connections are tight and secure to prevent loose contacts and potential hazards.
6. Operating Instructions
Once properly installed and powered, the DDS661 meter will automatically begin measuring and displaying electrical parameters on its LCD screen.
6.1 Display Modes
The meter cycles through various display modes automatically, showing different parameters. You can typically press a button (if present, usually labeled 'SET' or similar) to manually cycle through the displays or reset certain values (e.g., temporary power consumption). Refer to the specific model's front panel for button locations.
Image: Display parameters for DDS661 with RS485, including Positive/Reverse/Total Power, Power, Power Factor, Frequency, Voltage, and Current.
Image: Display parameters for DDS661 without RS485, showing similar measurements.
6.2 Reading Parameters
- kWh: Kilowatt-hour (energy consumption). This is the primary measurement.
- V: Voltage (in Volts).
- A: Current (in Amperes).
- W: Instantaneous Power (in Watts).
- Hz: Frequency (in Hertz).
- PF: Power Factor.
- Total Power: Accumulated energy consumption.
- Positive Power Consumption: Energy consumed from the grid.
- Reverse Power Consumption: Energy fed back to the grid (if applicable).
6.3 Data Retention
The meter is designed to retain all accumulated energy data even if power is lost. This ensures continuous and accurate tracking of consumption without manual resets after outages.
7. Maintenance
- Cleaning: Use a soft, dry cloth to clean the meter's exterior. Do not use abrasive cleaners or solvents.
- Connection Check: Periodically inspect wiring connections to ensure they remain tight and free from corrosion.
- Environmental Conditions: Ensure the operating environment remains within specified temperature and humidity limits.
- No User-Serviceable Parts: Do not attempt to open or repair the meter yourself. Refer to qualified service personnel for any issues.
8. Troubleshooting
- No Display:
- Check if the power supply is connected correctly and active.
- Verify the input voltage is within the rated range.
- Incorrect Readings:
- Ensure wiring is correct according to the diagram (L and N are not swapped).
- Confirm the load is connected properly.
- Check for any loose connections.
- RS485 Communication Issues (for RS485 models):
- Verify RS485+ and RS485- connections are correct.
- Check communication settings (baud rate, parity, data bits, stop bits) on your Modbus master device.
- Consult the manufacturer for the specific Modbus register map if needed.
9. User Tips
- Data Persistence: Many users appreciate that the meter's readings are saved even after a power cut, allowing for accurate long-term consumption tracking without loss of data.
- RS485 Integration: For advanced users looking to integrate the meter into a home automation or energy management system, understanding the Modbus-RTU protocol and obtaining the device's register map from the manufacturer is crucial for successful communication.
- Clear Display: The backlit LCD display is generally well-regarded for its readability, even in low-light conditions.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.
