1. Introduction
The SINOTIMER DDS529MR is a single-phase AC electricity energy meter designed for measuring active energy (kWh), voltage, current, power, frequency, and power factor. It features RS485 Modbus RTU communication for remote data acquisition and a pulse output for energy monitoring. The meter is designed for 35mm DIN rail installation, making it suitable for various electrical distribution systems.
A variant, the DDS529R, is also available, which displays only kWh.
2. Safety Information
- Installation and maintenance should only be performed by qualified personnel.
- Ensure all power is disconnected before installation or wiring to prevent electric shock.
- Follow all local and national electrical codes and regulations.
- Do not operate the meter if it appears damaged.
- The meter is designed for indoor use in a dry environment.
3. Package Contents
Upon opening the package, please verify that all items are present and undamaged:
- 1 x DDS529MR (or DDS529R) Energy Meter
- 1 x English Operation Manual
4. Specifications
| Parameter | Value |
|---|---|
| Model Number | DDS529MR |
| Brand Name | SINOTIMER |
| Rated Current | 5A |
| Max Operating Current | 80A |
| Rated Voltage | 230V AC |
| Output Voltage | 230V AC |
| Power Supply | AC |
| Phase | Single Phase |
| Display Type | Digital Only (LCD) |
| Display (DDS529MR) | KWh, Voltage, Current, Power, Frequency, Power Factor |
| Measuring Energy Range | 0 to 999999.9 kWh |
| Accuracy Class | 1 |
| Pulse Frequency | 1000 imp/kWh |
| Communication Protocol | RS485 Modbus RTU |
| Operating Temperature | -10 to 50 °C |
| Dimensions (L*W*H) | 100mm * 65mm * 35mm |
| Installation | 35mm DIN Rail |
| Certification | CE |
| Battery Included | No |
5. Setup and Installation
5.1 DIN Rail Mounting
The DDS529MR energy meter is designed for standard 35mm DIN rail installation. Simply clip the meter onto the DIN rail in your electrical panel.
5.2 Wiring Instructions
WARNING: Ensure all power is OFF before proceeding with wiring. Incorrect wiring can cause damage to the meter, property, or personal injury.
The meter uses a 2-wire single-phase connection. Refer to the wiring diagram below for proper connections.
- Power Input: Connect the Live (L) wire to terminal 1 and the Neutral (N) wire to terminal 4.
- Power Output: Connect the Live (L) wire to terminal 2 and the Neutral (N) wire to terminal 3.
- RS485 Communication: Connect RS485 A to terminal A and RS485 B to terminal B. (Refer to the side view image for terminal locations).
- Pulse Output: Connect the pulse output (SO+, SO-) to terminals 21 and 20 respectively for external pulse counting.
After wiring, ensure all terminal screws are tightened securely. Close the terminal cover before restoring power.
6. Operating Instructions
6.1 Display Functions (DDS529MR)
The DDS529MR model features a multifunctional LCD display that cycles through various electrical parameters. Use the 'TURN' button to manually cycle through the display modes. The 'SET' button is typically used for configuration, though specific advanced settings may require the RS485 interface.
The display typically shows:
- kWh: Total accumulated active energy consumption.
- V: Instantaneous voltage.
- A: Instantaneous current.
- W: Instantaneous active power.
- PF: Power factor.
- Hz: Frequency.
The DDS529R model will only display kWh.
6.2 Pulse LED Indicator
A pulse LED on the front panel indicates the working status of the meter. It flashes at a rate of 1000 impulses per kWh, providing a visual confirmation of energy consumption.
6.3 Display Cycling Demonstration
Watch this video to see the meter's display cycling through different parameters:
7. Maintenance
- Keep the meter clean and free from dust. Use a soft, dry cloth for cleaning. Do not use liquid cleaners.
- Regularly check all wiring connections to ensure they remain secure.
- Ensure the operating environment stays within the specified temperature and humidity ranges.
8. Troubleshooting
8.1 No Display / Meter Not Powering On
- Check the main power supply to ensure it is active.
- Verify that the Live (L) and Neutral (N) wires are correctly connected to terminals 1 and 4 respectively, and that connections are secure.
- Ensure the rated voltage (230V AC) is supplied to the meter.
8.2 Incorrect Readings
- Confirm that the wiring for input and output is correct as per the diagram (Figure 3).
- Ensure the load connected is within the meter's maximum current rating (80A).
8.3 RS485 Communication Issues
- Check the RS485 A and B connections for correct polarity and secure contact.
- Verify the communication settings (baud rate, parity, data bits, stop bits) on your Modbus master device match the meter's settings.
- Ensure the RS485 Modbus RTU document is consulted for detailed communication protocols.
9. User Tips
- For accurate energy monitoring, ensure the meter is installed in a stable environment, free from excessive vibrations or extreme temperatures.
- When using the RS485 communication, it is recommended to use shielded twisted-pair cables to minimize interference.
- Periodically record kWh readings to track energy consumption trends over time.
10. Warranty and Support
For any technical support, warranty claims, or inquiries regarding the RS485 Modbus document, please contact the seller or manufacturer directly. Provide your product model (DDS529MR) and any relevant purchase information for faster assistance.