1、 Overview

The DDSY2255 electronic three-phase prepaid energy meter (hereinafter referred to as the meter) uses microelectronics technology to measure electrical energy, adopts a fully shielded and fully sealed structure, and uses an advanced single-chip processing system for data acquisition, processing, and storage. It has the characteristics of good resistance to electromagnetic interference, low self consumption and energy saving, high-precision without the need for calibration, anti-theft, mutual inductance type 1.5 (6) A and direct type 5 (80) A wide range, high overload protection, and long life.
Main features: Application APP combined with cloud backend computer management, purchasing electricity first and then using it; The maximum operating power can be limited within the rated current range (limited by the power supply department); The electricity meter is paid through WeChat, Alipay and cash, and the yellow light flashes to remind users to purchase electricity; When the battery level is zero, it will automatically trip and disconnect. The electricity meter has anti-theft software design, etc.
The DDSY series electronic prepaid energy meter is suitable for measuring active energy with a frequency of 50Hz or 60Hz, and is installed in indoor or outdoor meter boxes for use. Suitable for environments with temperatures ranging from -10 to+50 ℃, relative humidity not exceeding 85%, and no corrosive gases in the surrounding air to avoid the effects of dust, salt spray, condensation, etc.

2、 Technical parameters:

● Error limit

● Start up
Under the conditions of rated voltage, rated frequency, and power factor of 1.0, when the load current of the energy meter is the specified value in the table below, the energy meter should be able to start and continuously measure electrical energy.


● Submersible movement
When there is no current on the current line of the energy meter and the voltage applied to the voltage line is 115% of the rated value, the test output of the energy meter should not generate more than one pulse within the specified time.
● Insulation performance
All circuits of the electric energy meter can withstand a pulse voltage with a waveform of 1.2/50 μ S and a peak value of 6KV between the watch case or the metal parts that can be touched outside the watch case, and can be tested continuously for 10 times at different polarities without arc discharge or breakdown.
All lines of the electric energy meter can withstand an actual sinusoidal waveform AC voltage of 2 KV with a frequency of 50Hz, and the test lasts for one minute without breakdown.

3、 Functional Features

1. Communication can be achieved without installing concentrators, collectors, GPRS devices, and other equipment.
2. Built in high current magnetic holding relay switch, power off when the balance is zero.
3. Safety of automatic tripping protection circuit for over power/over-current.
4. The electric meter is equipped with a built-in WIF module, which ensures stable communication and fast speed.
5. No need to install RS485 wires or modify the wiring, it can be used directly.
After successful registration by the property management and landlord, users can scan the QR code and register the electricity meter on site to use it.
7. Add cloud backend management to the APP. After the phone or computer is damaged, the data can be retrieved by logging in to the account.
8. Dynamic password encryption management ensures information security and peace of mind, with data permanently stored in the cloud.
9. WeChat, Alipay and cash payment are flexible and convenient.
10. Payment can be made without the need to register for corporate WeChat, providing flexible payment methods for both corporate and private transactions.
11. LCD display with backlight, allowing users to easily check the meter's battery level and remaining balance.
12. Single phase meter 5 (60) A, three-phase meter 1.5 (6) A and 5 (80) A wide range, meeting the current needs of most users.
13. As long as the Android system has WiFi function on the phone, it can be recharged.
14. Have a certain level of anti-theft software design; Infrared, 485 data reading, power outage display (optional)
15. Insufficient balance warning: The turn off light starts flashing (yellow light), indicating that the meter has reached the set alarm amount, and the user needs to recharge the meter in a timely manner.
16. Balance reset to zero and power off: When the remaining battery level displays zero or negative, a "power off" prompt will be displayed, and the power off light will remain on (yellow light). The user should immediately charge the battery.

4、 Installation dimension diagram

5、 Installation and use

1. The electric meter has been inspected and qualified before leaving the factory, and is equipped with a special lead seal for installation and use. If there is no lead seal or it has been stored for too long, relevant departments should be asked to re verify and seal it before installation and use.
2. The electric meter should be installed in a dry and ventilated place, and the bottom plate for installing the electric meter should be fixed on a sturdy, fire-resistant, and vibration resistant wall. The height of the electric meter is about 1.8 meters.
3. Connect the wires according to the circuit diagram, tighten the wiring screws, and secure the connecting plate inside the terminal box.
4. The reading of an electric meter connected through a transformer must be multiplied by the transformation ratio to obtain the actual amount of electrical energy.
5. Operation display: During the operation of the electricity meter, it alternately displays the remaining amount, total electricity consumption, meter number, voltage, and current in the meter.
6. Overcapacity alarm: During the operation of the electricity meter, if the set alarm power is exceeded, the meter will trip and automatically close after 5 minutes.
7. The transportation and unpacking of electric energy meters should not be subjected to severe impacts, and should be transported and stored in accordance with the provisions of GB/T15464-1995 General Technical Conditions for Packaging of Instruments and Meters.
8. The energy meter should be stored in its original packaging in an environment with a temperature range of -40 ℃ to 60 ℃, a relative humidity of ≤ 85%, and no corrosive gases in the air.
9. Electric energy meters should be stored in the warehouse and placed on shelves with a stacking height of no more than 5 boxes. After unpacking, the stacking height of individual packaged energy meters should not exceed 10. A single unpacked electric energy meter should not be stored.

6、 Guarantee period

Within 18 months from the date of manufacture of the electric meter, if the user complies with the requirements specified in this manual and finds that the electric meter does not meet the technical requirements with intact lead seals at the manufacturer, the manufacturer will provide free repair or replacement.