EARU DDS665 Bi-Directional Energy Meter Instruction Manual

1. Introduction

The EARU DDS665 is a multifunction single-phase 2-wire energy meter designed for accurate measurement of both city power energy and negative power energy generated by sources like solar PV systems or generators. It provides real-time display of various electrical parameters and supports RS485 communication for data transmission.

Front view of the DDS665 energy meter, showing its compact design and digital display.

2. Specifications

The following table outlines the technical specifications for the DDS665 Bi-Directional Energy Meter:

Parameter	Value
Model Number	DDS665
Dimensions	90mm x 45mm x 70mm
Rated Voltage	230V AC
Output Voltage	230V 50Hz
Current Range	5(100)A
Max Operating Current	80A - 99A
Accuracy Class	1.0
Phase	Single Phase
Rated Frequency	50Hz
Constant Pulse	1600imp / kWh
Power Consumption	≤2W, 10VA
Starting Current	0.004Ib
Operating Temperature	-20℃ to +55℃
Storage Temperature	-25℃ to +70℃
Power Supply	AC
Display Type	Digital Only (LCD with Backlight)
DIY Supplies	Electrical
Certification	CE

Diagram illustrating the dimensions of the DDS665 energy meter (90mm x 45mm x 70mm) and a table of key product parameters. — Dimensions and key parameters of the DDS665 energy meter.

3. Setup and Installation

The DDS665 energy meter is designed for easy installation on a standard 35mm DIN rail.

3.1 Physical Installation

Mount the meter securely onto a 35mm DIN rail in your electrical panel. Ensure sufficient space for wiring and ventilation.

Side view of the DDS665 energy meter, showing the integrated clip for DIN rail mounting. — Side view showing the DIN rail mounting clip.

The DDS665 energy meter installed on a standard DIN rail. — DDS665 energy meter installed on a DIN rail.

3.2 Wiring Instructions

Connect the meter according to the following diagram. Ensure all connections are secure and follow local electrical codes. The meter supports both input and output connections for bi-directional measurement.

Detailed wiring diagram for the DDS665 energy meter, showing connections for Neutral (N) and Live (L) for both input and output, as well as terminals for Impulse Output (23+, 22-) and RS485 communication (21-A, 20-B). — Wiring diagram for the DDS665 energy meter.

Terminal Connections:

N IN / L IN: Neutral and Live input from the power source.
N OUT / L OUT: Neutral and Live output to the load.
23+ / 22-: Impulse Output terminals.
21-RS485 A / 20-RS485 B: RS485 communication terminals (Modbus-RTU protocol, supports transmission only).

Front view of the DDS665 energy meter highlighting its RS485 communication protocol (Modbus-RTU) and indicating support for transmission only. — DDS665 meter with RS485 (Modbus-RTU) communication details.

3.3 Bi-Directional Measurement Setup Example

The DDS665 meter is capable of bi-directional measurement, suitable for applications involving solar PV systems or generators. An example setup is shown below:

System diagram illustrating a two-way meter bi-directional measuring setup, including PV module, inverter, subsidized meter, distribution box, and connection to the low voltage network. — Example of a two-way bi-directional measuring setup.

4. Operating Instructions

The DDS665 meter features an LCD display with backlight to show various electrical parameters. It measures both positive active energy (energy consumed from the grid) and negative active energy (energy generated and fed back to the grid, e.g., from solar or a generator).

4.1 Display Parameters

The meter cycles through the following parameters on its display:

Total Active Energy (KWh)
Positive Active Energy (KWh)
Negative Active Energy (KWh)
Temporary Active Energy (KWh)
Voltage (V)
Current (A)
Active Power (W)
Power Factor (PF)
Frequency (Hz)
Meter ID (Id)
Baud Rate (bd)
Constant (C)

Front view of the DDS665 energy meter display, showing various measurement parameters including total active energy, positive active energy, negative active energy, temporary active energy, voltage, current, power factor, frequency, meter ID, baud rate, and constant. Indicates RS485 bi-directional capability. — DDS665 meter display showing various parameters.

4.2 Navigating the Display

The meter automatically cycles through the various parameters. To manually cycle or view specific parameters, press the button located on the front of the meter. Each press will advance to the next parameter.

Video demonstrating the DDS665 energy meter cycling through its various display parameters and the button press for operation.

4.3 Resetting Temporary kWh

To reset the temporary kWh reading to zero, press and hold the button on the front of the meter for 6 seconds. Please note that the Total kWh value cannot be reset.

Close-up of the DDS665 meter display with instructions for resetting temporary kWh. It also highlights the meter's ability to measure both positive energy (from grid) and negative energy (from solar or generator). — Instructions for resetting temporary kWh and explanation of bi-directional measurement.

5. Maintenance

The DDS665 energy meter requires minimal maintenance. Keep the device clean and free from dust. Do not use abrasive cleaners or solvents. Ensure the operating and storage temperature ranges are respected to maintain optimal performance and longevity.

6. Troubleshooting

If you encounter issues with your DDS665 energy meter, consider the following common troubleshooting steps:

No Display/Power: Check all wiring connections to ensure they are secure and correctly connected to the power source. Verify that the power supply is within the rated voltage range (230V AC).
Incorrect Readings: Double-check the wiring according to the diagram in Section 3.2. Ensure the meter is installed correctly for the desired measurement (e.g., bi-directional for solar PV).
RS485 Communication Issues: Verify the RS485 wiring (A and B terminals). Ensure the baud rate and other communication parameters are correctly configured on your Modbus master device to match the meter's settings. The meter supports Modbus-RTU protocol for transmission only.

7. User Tips

Modbus Integration: For advanced users integrating the meter with a Modbus system, it is crucial to obtain the correct Modbus register map from the manufacturer or supplier. This map details the addresses for reading various parameters (e.g., KWh, Voltage, Current) via RS485.
Regular Monitoring: Periodically check the meter's display to ensure it is functioning correctly and providing consistent readings.

8. Warranty and Support

For warranty information, technical support, or service inquiries, please refer to the contact information provided by your retailer or the manufacturer. Keep your purchase receipt as proof of purchase.