1. Introduction
This manual provides essential information for the safe and effective use of your PPOZYLPC DDS668 110V Single Phase LCD Digital Energy Meter. This device is designed to accurately measure and display electrical parameters such as active energy (kWh), voltage, current, active power, frequency, and power factor in single-phase AC circuits. Please read this manual thoroughly before installation and operation to ensure proper function and safety.
2. Safety Information
WARNING: Electrical installation and wiring should only be performed by qualified personnel. Failure to follow these instructions can result in electric shock, fire, or serious injury.
- Always disconnect power before installing or servicing the meter.
- Ensure all connections are secure and correct according to the wiring diagram.
- Do not operate the meter in environments with excessive moisture, dust, or corrosive gases.
- Do not attempt to open or repair the meter yourself. Contact qualified service personnel.
- Verify the voltage and current ratings of the meter match your application before installation.
3. Product Overview
The PPOZYLPC DDS668 is a compact, single-phase digital energy meter designed for DIN rail mounting. It features an LCD display for clear readings of various electrical parameters. The meter is equipped with a reset function for the kWh reading, allowing for monitoring of energy consumption over specific periods.
Key Features:
- Measures active energy (kWh), voltage (V), current (A), active power (W), frequency (Hz), and power factor (PF).
- LCD digital display for easy reading.
- DIN rail mounting for convenient installation.
- Energy consumption reset function.
- High accuracy and reliability.

Figure 3.1: Front view of the PPOZYLPC DDS668 110V Single Phase LCD Digital Energy Meter. This image shows the compact design and the LCD display.

Figure 3.2: Display examples for various meter models, including the DDS668. The DDS668 display shows kWh, Voltage, Current, Power, Frequency, and Power Factor readings.
4. Specifications
| Parameter | Value |
|---|---|
| Model | DDS668 |
| Rated Voltage | AC 110V |
| Frequency | 60Hz |
| Display | LCD Digital |
| Mounting | 35mm DIN Rail |
| Dimensions (L x W x H) | Approximately 78mm x 36mm x 66mm (3.07 x 1.42 x 2.60 inches) |
| Item Weight | Approximately 111 grams (3.92 ounces) |
| Operating Temperature | Refer to product packaging |
| Accuracy Class | Class 1 (IEC 62053-21) |

Figure 4.1: Detailed dimensions of the meter and a table of voltage parameters for various models. For DDS668, the rated voltage is AC110V/60Hz.
5. Setup and Installation
Before proceeding with installation, ensure the main power supply is disconnected to prevent electric shock. This meter is designed for 35mm DIN rail mounting.
5.1 Mounting
- Locate a suitable 35mm DIN rail within your electrical panel or enclosure.
- Align the meter's DIN rail clip with the rail.
- Press the meter firmly onto the rail until it clicks into place. Ensure it is securely fastened.
5.2 Wiring Diagram
The DDS668 is a single-phase, two-wire energy meter. Refer to the markings on the meter for correct terminal connections. Typically, the wiring involves connecting the live (L) and neutral (N) wires from the power source to the meter's input terminals, and then connecting the load to the meter's output terminals.
- Terminal 1 (L-in): Live wire from the power source.
- Terminal 2 (N-in): Neutral wire from the power source.
- Terminal 3 (L-out): Live wire to the load.
- Terminal 4 (N-out): Neutral wire to the load.
Always double-check the terminal labels on your specific meter model as they may vary slightly. Ensure all connections are tight to prevent overheating and poor contact.
5.3 Initial Power-Up
After completing all wiring and ensuring connections are secure, restore power to the circuit. The meter's LCD display should illuminate and begin showing readings. If the display does not light up, immediately disconnect power and re-check all wiring.
6. Operating Instructions
The DDS668 meter provides real-time readings of various electrical parameters on its LCD display.
6.1 Display Readings
The meter cycles through different parameters automatically or can be manually cycled using the "PRESS" button (if present, indicated by a hand icon on some models like DDS668 in Figure 3.2). The typical parameters displayed include:
- kWh: Total active energy consumption (kilowatt-hours).
- V: Real-time voltage (Volts).
- A: Real-time current (Amperes).
- W: Real-time active power (Watts).
- Hz: Frequency (Hertz).
- PF: Power Factor.
6.2 Resetting kWh (Energy Consumption)
The DDS668 model features a reset function for the kWh reading, allowing you to monitor energy consumption over specific periods (e.g., daily, weekly, monthly). To reset the kWh reading:
- Ensure the meter is powered on and displaying the kWh reading.
- Locate the reset button or area on the meter (often indicated by a "PRESS" label or a hand icon, as seen in Figure 3.2 for DDS668).
- Press and hold the button for approximately 3-5 seconds until the kWh reading resets to zero.
- Release the button. The meter will resume normal operation, starting a new energy consumption measurement from zero.
Note: Resetting the kWh value will clear all accumulated energy data. This action cannot be undone.
7. Maintenance
The PPOZYLPC DDS668 meter is designed for long-term, maintenance-free operation. However, following these simple guidelines can help ensure its longevity and accuracy:
- Cleaning: Use a soft, dry cloth to clean the meter's exterior. Do not use abrasive cleaners, solvents, or liquids that could damage the display or internal components.
- Environment: Ensure the meter is installed in a dry, well-ventilated area, free from direct sunlight, excessive heat, dust, and corrosive substances.
- Connections: Periodically check terminal connections to ensure they remain tight and free from corrosion. Loose connections can lead to inaccurate readings or overheating.
8. Troubleshooting
If you encounter issues with your DDS668 meter, refer to the following troubleshooting guide:
| Problem | Possible Cause | Solution |
|---|---|---|
| No display or blank screen | No power supply; incorrect wiring; internal fault. |
|
| Incorrect or erratic readings | Loose connections; interference; meter overload; faulty meter. |
|
| kWh reading does not reset | Button not pressed correctly; internal fault. |
|
9. Warranty and Support
PPOZYLPC products are manufactured to high-quality standards. While specific warranty details are not provided in this manual, most products come with a standard manufacturer's warranty against defects in materials and workmanship.
For warranty claims, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.
When contacting support, please provide the following information:
- Product Model: DDS668
- Date of Purchase
- Description of the issue