1. Product Overview
The DIANQI DDS665 is a single-phase two-wire energy meter designed for measuring power consumption. It features a multi-function LCD display with backlight, RS485 communication (Modbus-RTU), and an optional on-off function. This meter is capable of bi-directional measurement, allowing it to measure both city power energy and negative power energy, such as from solar PV systems or generators.
It provides real-time display of Total Active Energy (KWh), Positive Active Energy (KWH), Negative Active Energy (KWH), Temporary Active Energy (KWH), Voltage, Current, Active Power, Power Factor, and Frequency.
2. Safety Instructions
This manual contains important safety information that must be adhered to for personal safety and to avoid material damage. Information highlighted by a warning triangle indicates potential danger.
⚠️ Warning
Failure to observe instructions can result in death, serious injury, or considerable material damage.
⚡ Caution (Electric Shock Hazard)
Hazard of electric shock. Failure to take necessary safety precautions will result in death, serious injury, or considerable material damage.
Qualified Personnel
Commissioning and operation of this equipment must only be performed by qualified personnel. Qualified personnel are authorized to commission, start up, ground, and label devices, systems, and circuits according to safety and regulatory standards.
Intended Use
The equipment is intended for application cases specified in the catalog and user manual, and only in connection with recommended and approved devices and components.
Proper Handling
- Use only isolated tools.
- Do not connect while the circuit is live (hot).
- Do not connect the meter to a 3-phase, 400VAC network.
- Place the meter only in dry surroundings.
- Do not mount the meter in an explosive area or where it is exposed to dust, mildew, or insects.
- Ensure wires are suitable for the meter's maximum current.
- Ensure AC wires are connected correctly before activating current/voltage.
- Do not touch meter connecting clamps directly with bare hands, metal, or blank wire to avoid electric shock.
- Ensure the protection cover is placed after installation.
- Installation, maintenance, and repair should only be done by qualified personnel.
- Never break seals or open the front cover, as this may affect functionality and void warranty.
- Avoid dropping or physical impact to the meter, as it contains high-precision components.
3. Specifications
| Parameter | Value |
|---|---|
| Model Number | DDS665 |
| Brand Name | DIANQI |
| Phase | Single phase |
| Rated Voltage (Un) | 230V AC (Operational: 161-300V AC) |
| Rated Frequency | 50Hz ±10% |
| Basic Current (Ib) | 5 A |
| Maximum Rated Current (Imax) | 32 A (5(100)A) |
| Max Operating Current | 80A - 99A |
| Operational Current Range | 0.25A - 32A |
| Over Current Withstand | 960A for 0.01s |
| Accuracy Level | 1 (IEC 62053-21) |
| Display Type | LCD with Backlight (7+1 digits) |
| Power Supply | AC |
| Internal Power Consumption | ≤2W / 10VA |
| Test Output Flash Rate (RED LED) | 1000 impulses per kWh (0.5Wh/imp) |
| Pulse Output Rate (pins 20 & 21) | 1000 pulses per kWh (0.5Wh/imp) |
| Starting Current | 0.004Ib |
| Operating Temperature | -20℃ to +55℃ (-10℃ to +50℃) |
| Storage Temperature | -25℃ to +70℃ (-30℃ to +70℃) |
| Operating Humidity | ≤ 75% |
| Storage Humidity | ≤ 95% |
| Insulation Capabilities (AC voltage withstand) | 2KV for 1 minute |
| Insulation Capabilities (Impulse voltage withstand) | 6KV – 1.2µS waveform |
| Protection against penetration of dust and water | IP51 |
| Insulating encased meter of protective class | II |
| Data Save | Data stored for more than 20 years when power is cut. |
| Dimensions (Height x Width x Depth) | 91mm x 35.8mm x 70.5mm (approx. 116mm x 17.5mm x 59mm) |
| Net Weight | 0.12 Kg |
Materials
- Window of register: PC inflammable retarding
- Case: PA inflammable retarding
- Terminal block: PA inflammable retarding
- Protection cover: PA inflammable retarding
4. Installation and Setup
⚠️ CAUTION
- Turn off and lock out all power supplying the energy meter and the equipment to which it is installed before working on it.
- Always use a properly rated voltage sensing device to confirm that power is off.
⚠️ WARNING
- Installation should be performed by qualified personnel familiar with applicable codes and regulations.
- Use isolated tools to install the meter.
- Fuse or thermal cut-off or single-pole circuit breaker cannot be fitted on the supply line and not the neutral line.
- Case is sealed; failure to observe this instruction can result in damage to the meter.
General Installation Guidelines
- The connecting wire to the outside circuit should be sized according to local codes and regulations for the ampacity of the circuit breaker or overcurrent device.
- An external switch or circuit-breaker should be installed on the inlet wire as a disconnection device, located near the meter for operator convenience. It must comply with building electrical design specifications and local regulations.
- An external fuse or thermal cut-off for overcurrent protection must be installed on the supply side wire, near the meter. It must comply with building electrical design specifications and local regulations.
- The meter can be installed indoors directly or in a waterproof outdoor meter box, subject to local codes and regulations.
- To prevent tampering, secure the meter with a padlock or similar device.
- The meter must be installed against a fire-resistant wall.
- Install the meter in a well-ventilated and dry place.
- Install the meter in a protection box in dangerous or dusty environments.
- The meter can be installed and used after being tested and sealed with a letter press printing.
- The meter can be installed on a 35mm DIN rail.
- The meter should be installed at an accessible height for easy reading.
- If installed in an area with frequent surges (e.g., thunderstorms, welding machines, inverters), protect the meter with Surge Protection Devices.
- After installation, the meter must be sealed to prevent tampering.
Wiring Diagram
Connection of the wires should be done in accordance with the diagram below:
Terminal Connections:
- 1: Inlet phase line (L)
- 4: Inlet neutral line (N)
- 3: Outgoing phase line (L)
- 6: Outgoing neutral line (N)
- 20 and 21: Pulse output contact
5. Operating Instructions
Working Indication
A white LED on the front panel indicates the meter's status:
- Green: Meter is working normally.
- Off: Meter is not working or has no power supply.
Consumption Indication
A red LED on the front panel indicates power consumption:
- Flashing Red: Indicates consumption is occurring.
- Faster Flashing: Indicates higher consumption.
- The flash rate is 1000 impulses per kWh (0.5Wh/imp).
Reading the Meter
The DDS665 is equipped with an LCD display that shows energy data and indication messages.
Current Total Energy
In normal operation, the meter displays 7+1 energy data in kWh. This data cannot be reset by the user.
Indication for Reverse Use
If the meter is connected incorrectly (incoming line connected to outgoing, and vice versa), the LCD display will show "HELP 1" and the current total energy circularly to indicate the wrong connection. The circular display period is 3 seconds.
Meter Version
When the meter is powered on, it will display the meter version (e.g., U1.10) for 3 seconds before showing other items.
Pulse Output
The DDS665 DIN rail energy meter has a pulse output, fully separated from the internal circuit, that generates pulses proportional to the measured energy. This is used for remote reading and accuracy testing.
The pulse output is a polarity-dependent, passive transistor output requiring an external voltage source (5-27V DC) for operation. The maximum input current (Imax) is 27mA DC. To connect, connect 5-27V DC to connector 20 (anode) and the signal wire (S) to connector 21 (cathode). The meter pulses 1000 per kWh (0.5Wh/imp).
6. Maintenance
⚠️ CAUTION
- During repairing and maintenance, do not touch the meter connecting clamps directly with bare hands, with metal, blank wire or other material to avoid electric shock.
- Turn off and lock out all power supplying the energy meter and the equipment before opening the protection cover to prevent electric shock.
⚠️ WARNING
- Maintenance or repair must be performed by qualified personnel familiar with applicable codes and regulations.
- Use insulated tools to maintain or repair the meter.
- Ensure the protection cover is in place after maintenance or repair.
- The case is sealed; failure to observe this instruction can result in damage to the meter.
Regular inspection of connections and ensuring the meter is free from dust and moisture will help maintain its performance and longevity.
7. Troubleshooting
| Problem | Check | Solution |
|---|---|---|
| No light for Power supply indicator | Is AC power supply connected? Is 1 and 4 connecting correct? Fault in inside circuit? | Check switch/circuit-breaker and fuse. Reinstall terminal screws on 1 and 4; ensure 230V 50Hz AC voltage. Contact technical support if internal fault. |
| No light for consumption indicator | Is load running? Is operating power too low? Fault in inside circuit? | LED flashes only when load is running. If operating power is too low, flashing interval prolongs. Contact technical support if internal fault. |
| Register doesn't run | Is power supply indicator burning? Is operating power too low? Fault in inside circuit? | Check power supply indicator. If operating power is too low, running interval prolongs. Contact technical support if internal fault. |
| No pulse output | Is DC power supply connected? Is connecting correct? Fault in inside circuit? | Check external voltage source (Ui) is 5-27V DC. Connect 5-27V DC to connector 20 (anode) and signal wire (S) to connector 21 (cathode). Contact technical support if internal fault. |
| Pulse output rate wrong | Fault in inside circuit? | Contact technical support to replace meter. |
8. User Tips
- Resetting Temporary kWh: To reset the temporary kWh reading to 0, hold the button on the meter for 6 seconds. Note that the Total kWh cannot be reset.
- Monitoring Bi-directional Energy: This meter is capable of measuring both consumption from the grid and generation (negative power) from sources like solar panels. Pay attention to the Positive Active Energy KWH and Negative Active Energy KWH readings for a complete energy overview.
9. Warranty and Support
For detailed warranty information, technical support, or service inquiries, please refer to the official product documentation or contact the manufacturer/seller directly. A comprehensive user manual in PDF format may be available for download from the seller's website or via this link: DDS665 User Manual (PDF).