1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the CHNT CHINT DDSU666 and DTSU666 series smart energy electric meters. These meters are designed for DIN-rail mounting and are used for measuring active power in single-phase or three-phase systems, featuring RS485 Modbus communication.
Important Compatibility Note: These meters are NOT compatible with inverters from Solax, Sofar, Sungrow, Growatt, Huawei, Deye, Hoymiles, or Goodwe. Please ensure compatibility with your system before installation.
2. Setup and Installation
The DDSU666 and DTSU666 meters are designed for DIN-rail installation. Ensure all power is disconnected before proceeding with installation.
2.1 Model Variants and CT Requirements
- DDSU666 80A Modbus: Single-phase meter with Modbus-RTU communication. Does not require an external Current Transformer (CT).
- DDSU666 1.5(6)A Modbus: Single-phase meter with Modbus-RTU communication. Requires an external Current Transformer (CT) for operation (CT not included).
- DDSU666 80A Not RS485: Single-phase meter without communication function. Does not require an external Current Transformer (CT).
- DTSU666 Series: Three-phase meters with Modbus-RTU communication. Models like DTSU666 1.5(6)A Modbus require external CTs.
2.2 Physical Installation
Mount the meter securely on a standard DIN-rail in a dry, well-ventilated area, away from direct sunlight and excessive vibration. Ensure adequate space for wiring connections.
2.3 Wiring Diagrams
Follow the appropriate wiring diagram for your specific meter model. Incorrect wiring can cause damage to the meter or connected equipment.
2.3.1 DDSU666 5(80)A Wiring
2.3.2 DTSU666 5(80)A Wiring
2.3.3 DTSU666 1.5(6)A Wiring (with CTs)
2.4 RS485 Communication
Connect the RS485 A and B terminals to your Modbus network. Ensure correct polarity for communication.
3. Operating Instructions
Once installed and powered, the meter will display various parameters on its LCD screen.
3.1 LCD Display
The meter features an LCD display with 7 characters and a 7-segment display for clear readings. It indicates measured values such as:
- Total kWh (kilowatt-hours)
- Instantaneous kW (kilowatts)
- Instantaneous Irms (root mean square current)
- Vrms (root mean square voltage)
- Frequency
- Power factor
An LED indicator provides visual feedback, typically flashing to represent energy consumption (number of flashes per kWh).
3.2 Button Functions
The meter typically includes 'SET' and 'ESC' buttons for navigating through display modes and configuring settings. Refer to the on-screen prompts for specific functions.
4. Maintenance
The CHNT CHINT energy meters are designed for long-term, reliable operation with minimal maintenance.
- Cleaning: Keep the meter clean and free from dust. Use a soft, dry cloth for cleaning. Do not use abrasive cleaners or solvents.
- Connection Check: Periodically inspect all wiring connections to ensure they are secure and free from corrosion.
- Environmental Conditions: Ensure the operating environment remains within the specified temperature and humidity ranges to prevent damage.
5. Troubleshooting
If you encounter issues with your energy meter, refer to the following common problems and solutions:
- No Display: Check the power supply connections. Ensure the voltage is within the specified range.
- Incorrect Readings: Verify all wiring connections against the appropriate diagram. For CT models, ensure CTs are correctly installed and oriented.
- No RS485 Communication: Check RS485 wiring polarity (A/B). Verify Modbus settings (baud rate, parity, slave ID) on both the meter and the master device. Ensure the meter is compatible with your inverter system (refer to the important compatibility note in Section 1).
- LED Not Flashing: If the LED is not flashing during energy consumption, check the load connection and ensure the meter is correctly measuring current.
If problems persist, contact technical support for assistance.
6. Specifications
Detailed specifications for the DDSU666 and DTSU666 series meters are provided below.
6.1 DDSU666 Single Phase DIN-Rail Meter
| Category | Parameter | Value |
|---|---|---|
| Measurement | Compliance | IEC60252-11, IEC62053-21 |
| Connection Type | 1P2W | |
| Accuracy | Class 1.0 for active power | |
| Voltage | Nominal Voltage (Un) | 220V, 230V, 240V |
| Operating Range | 0.7Un ~ 1.2Un | |
| Current | Direct Connection | 5(80)A |
| CT Connection | 1.5(6)A | |
| Frequency | Frequency | 50Hz or 60Hz |
| LCD Display | Characters | 7 characters of 7 segment display |
| Digital Size | 5.3mm x 2.8mm | |
| LED Display | Indicator | Number of flashes per kWh |
| Environmental | Operating Range | -40°C to +75°C |
| Storage Range | -40°C to +85°C | |
| Relative Humidity | ≤ 95%RH | |
| Ingress Protection | IP54 | |
| Dimensions & Weight | Dimensions | 98mm × 65mm × 36mm |
| Weight | 0.2 kg (Approx.) | |
| Communications | Protocol | RS485 Modbus and DL/T |
6.2 DTSU666 Three Phase DIN-Rail Meter
| Category | Parameter | Value |
|---|---|---|
| Measurement | Compliance | IEC62052-11, IEC62053-21 |
| Connection Type | 3P4W | |
| Accuracy | Class 1.0 for active power | |
| Voltage | Nominal Voltage (Un) | 3*220/380V |
| Operating Range | 0.7Un ~ 1.2Un | |
| Current | Direct Connection | 5(80)A |
| CT Connection | 1.5(6)A | |
| Frequency | Frequency | 50Hz or 60Hz |
| LCD Display | Characters | 7 characters of 7 segment display |
| Digital Size | 5.3mm x 2.8mm | |
| LED Display | Indicator | Number of flashes per kWh |
| Environmental | Operating Range | -40°C to +75°C |
| Storage Range | -40°C to +85°C | |
| Relative Humidity | ≤ 95%RH | |
| Ingress Protection | IP54 | |
| Dimensions & Weight | Dimensions | 98mm × 65mm × 72mm |
| Weight | 0.4 kg (Approx.) | |
| Communications | Protocol | RS485 Modbus |
7. User Tips
- Inverter Compatibility: Always double-check the compatibility of this meter with your specific inverter brand and model. As noted, it is not compatible with Solax, Sofar, Sungrow, Growatt, Huawei, Deye, Hoymiles, or Goodwe inverters.
- Modbus Map: For advanced integration, you may need the Modbus memory map. If not provided with the product, contact the seller for the English version of the instructions manual which may contain this information.
- CT Installation: For models requiring Current Transformers (CTs), ensure they are installed correctly and in the right direction for accurate readings.
8. Warranty and Support
For specific warranty information, please refer to the terms provided at the time of purchase or contact your seller directly. For technical support, troubleshooting beyond this manual, or to request an English version of the detailed instructions manual, please contact the CHNT CHINT electric store or your product vendor.
