1. Introdución
This manual provides detailed instructions for the installation, operation, and maintenance of the Avoltik Huawei Smart Power Sensor DTSU666-H. This high-quality, three-phase current sensor is designed for use in photovoltaic (PV) systems, offering precise energy measurement and reliable communication capabilities.
Please read this manual thoroughly before installation and operation to ensure safe and efficient use of the device.
2. Características do produto
- Three-Phase Current Sensor: Specifically designed for solar power systems.
- Ancho VoltagRango: Operates efficiently within a voltagrango de 176 a 288 voltios.
- Low Self-Consumption: Features very low power consumption, less than one Watt.
- Fácil instalación: Designed for straightforward and effortless setup.
- Pantalla LCD integrada: Displays performance data and allows for easy operation directly on the device.
- Comunicación RS485: Supports data communication via RS485, enabling remote data reading.
- Modbus-RTU Protocol: Utilizes the Modbus-RTU communication protocol for seamless integration.

Image: The Smart Power Sensor DTSU666-H with visual callouts for its main features, including its three-phase capability, easy installation, LCD screen, RS485 communication, and low power consumption.
3. Especificacións técnicas
| Categoría | Especificación |
|---|---|
| Modelo | DTSU666-H 250/50 mA |
| Dimensións (H x W x D) | 100 x 65.5 x 72 mm |
| Weight (incl. cable) | 1.5 kg |
| Tipo de montaxe | Carril DIN 35 |
| Tipo actual | 3P4W (3-Phase) |
| Vol. De entradatage | 176-288 VAC (Phase/N) |
| Consumo de enerxía | ≤ 1 W |
| Interface de comunicación | RS485 |
| Velocidade en baudios | 9,600 bps |
| Protocolo de comunicación | Modbus-RTU |
| Measurement Accuracy (Voltage) | ±0.5 % |
| Measurement Accuracy (Current/Power/Energy) | ±1 % |
| Measurement Accuracy (Frequency) | ± 0.01 Hz |
| Measurement Range (Phase-Phase Voltage) | 304 - 499 Vac |
| Measurement Range (Phase Voltage) | 176 - 288 Vac |
| Measurement Range (Current) | 0 - 250 A |
| Rango de temperatura de funcionamento | -25 °C a +60 °C |
| Rango de temperatura de almacenamento | -40 °C a +70 °C |
| Humidade relativa | 5 % RH - 95 % RH |

Image: A detailed table outlining the technical specifications of the DTSU666-H Smart Power Sensor, including dimensions, weight, electrical parameters, and environmental conditions.
4. Contido do paquete
Ao abrir o paquete, comprobe que todos os compoñentes estean presentes e sen danos:
- 1x DTSU666-H Smart Power Sensor
- Current Transformers (250A/50mA)
- Necessary connection cables

Image: The complete package contents, showing the DTSU666-H Smart Power Sensor alongside its current transformers and connection cables.
5. Configuración e instalación
The DTSU666-H Smart Power Sensor is designed for easy installation, typically on a DIN35 rail. Ensure all safety precautions are followed during installation, especially when dealing with electrical systems.
5.1 Instrucións de seguridade
- A instalación debe ser realizada só por persoal cualificado.
- Disconnect all power sources before beginning installation.
- Use equipos de protección individual (EPI) adecuados.
- Asegurar a correcta posta a terra.
5.2 Montaxe do dispositivo
- Locate a suitable DIN35 rail within your electrical panel or enclosure.
- Snap the DTSU666-H sensor onto the DIN rail until it clicks securely into place.
5.3 Conexións eléctricas
Connect the sensor according to the wiring diagram provided with your PV system documentation. Key connections include:
- Voltage Entradas: Connect the three-phase voltage lines (L1, L2, L3) and neutral (N) to the corresponding terminals on the sensor.
- Current Transformer (CT) Connections: Connect the supplied current transformers to the main current lines of your PV system. Ensure correct polarity and connect the CT secondary wires to the sensor's current input terminals.
- Comunicación RS485: Connect the RS485 A and B terminals to your communication network (e.g., inverter, data logger) for Modbus-RTU communication.

Image: The DTSU666-H Smart Power Sensor shown in an installed context, emphasizing its role in a solar power system.
6. Funcionamento
Once installed and powered on, the DTSU666-H will begin measuring electrical parameters. The integrated LCD screen allows for direct monitoring and basic configuration.
Pantalla LCD 6.1 e navegación
The LCD screen displays various real-time data such as voltage, current, power, and energy consumption. Use the buttons below the screen to navigate through the display menus:
- Botón SET: Enters configuration mode or confirms a selection.
- Botón ESC: Sae dun menú ou cancela unha operación.
- Arrow Buttons (Left/Right): Navigates between different display screens or adjusts values in configuration mode.
6.2 Data Monitoring
Regularly check the LCD display for key operational data. For detailed analysis and historical data, connect the sensor to a compatible monitoring system via the RS485 interface and Modbus-RTU protocol.
7. Mantemento
The Avoltik Huawei Smart Power Sensor DTSU666-H requires minimal maintenance. Regular checks can help ensure its longevity and accurate performance.
- Limpeza: Keep the device clean and free from dust. Use a soft, dry cloth for cleaning. Do not use abrasive cleaners or solvents.
- Comprobacións de conexión: Inspeccione periodicamente todas as conexións eléctricas para garantir que estean seguras e libres de corrosión.
- Condicións ambientais: Asegúrese de que o ambiente de funcionamento se manteña dentro dos rangos de temperatura e humidade especificados para evitar danos.
No user-serviceable parts are inside the device. Do not attempt to open or repair the sensor yourself.
8 Solución de problemas
This section provides solutions to common issues you might encounter with your DTSU666-H Smart Power Sensor.
| Problema | Causa posible | Solución |
|---|---|---|
| Device not powering on / LCD blank | No power supply; Loose connections; Faulty device. | Check power input connections. Ensure circuit breaker is on. Verify voltage supply. If problem persists, contact support. |
| Incorrect readings on LCD | Incorrect CT wiring; Incorrect CT polarity; Sensor not calibrated. | Verify CT connections and polarity according to the wiring diagram. Ensure CTs are correctly sized for the application. |
| No communication via RS485 | Incorrect wiring (A/B reversed); Incorrect baud rate; Termination resistor missing/incorrect; Software configuration issue. | Check RS485 wiring (A to A, B to B). Verify baud rate and protocol (Modbus-RTU) settings on both sensor and master device. Ensure proper termination. |
| Sobrequecemento do dispositivo | Poor ventilation; Overload; High ambient temperature. | Ensure adequate ventilation around the device. Check if the current load exceeds the sensor's rating. Relocate to a cooler environment if necessary. |
If you encounter issues not listed here or if the suggested solutions do not resolve the problem, please contact Avoltik customer support.
9. Garantía e soporte
Avoltik products are manufactured to the highest quality standards. For warranty information, please refer to the warranty card included with your product or visit the official Avoltik websitio.
For technical support, troubleshooting assistance, or spare parts, please contact Avoltik customer service:
- Websitio: Avoltik Official Store
- Correo electrónico: [Refer to product packaging or website for specific email]
- Teléfono: [Refer to product packaging or website for specific phone number]
Please have your product model (DTSU666-H) and purchase date ready when contacting support.
10. Aplicacións versátiles
The Avoltik Huawei Smart Power Sensor DTSU666-H is a versatile and reliable solution suitable for various solar energy applications, ensuring optimal performance and monitoring.

Image: An illustration showing the versatility of solar power systems, indicating their applicability for roofs, open fields, boats, and balconies, all of which can benefit from the DTSU666-H sensor.





