1. Overview

DDZY10000 single-phase IoT cost controlled energy meter is used to measure AC single-phase active energy with a rated frequency of 50Hz.

This product is manufactured using internationally advanced specialized ultra large scale integrated circuits and SMT technology. Key components are made of internationally renowned brands of low-power and long-life devices. The overall design adopts multiple anti-interference technologies to ensure the reliability and service life of the product. The data display adopts a large screen Chinese LCD for easy identification.

This product can directly and accurately measure positive and negative active energy. Can store data for up to 12 settlement reports. It has event recording and load recording functions. It also has infrared and RS485 communication functions, which can achieve remote meter reading and setting. The communication protocol follows the DL/T645-2007 and DL/T645-1997 standards. Its performance indicators comply with the GB/T 17215.321-2008 standard.

2. Working principle

2.1 Working principle diagram

2.2 Working principle explanation

The electric energy meter consists of two main functions: one is the electric energy metering part, and the other is the microprocessor control part. The electric energy metering part uses a shunt multiplication circuit to sample and convert current and voltage signals, and the microprocessor performs electric energy metering. The microprocessor transmits data to the load switch to achieve power control function.

3. Main specifications and technical parameters

3.1 Main specifications

Note: The pulse constant is based on the nameplate parameters.

3.2 Technical Parameters

4. Main functions

4.1 Electricity metering

1)It has the function of combining and measuring positive and negative active energy.

2)Equipped with time-sharing metering function, it can accurately measure the forward and reverse active electrical energy

Record, accumulate, and store the peak, flat, and valley periods separately.

3)Parameter measurement

This instrument can measure and display real-time voltage, current, active power, and power factor.

4.2 Rates and Time Periods

It has two sets of programmable rates and time slots, with 4 rates and 14 daily time slots available 24 hours per time zone, and the ability to use another set of rates and time slots at the set time point.

4.3 Event Recording

4.3.1 Record the last 10 reset events.

4.3.2 Record the last 10 programming events.

4.3.3 Record the last 10 power outage events.

4.3.4 Record the last 10 incidents of opening the meter cover.

4.3.5 Record the last 10 power purchase records.

4.4 Data Storage

4.4.1 It can store the total and rate energy data of the first 12 meter reading (settlement) cycles, and the data transfer boundary time is 24:00 on the last day of each month (midnight at the beginning of the month) or any time between the 1st and 28th of each month (the default initial value at the factory is midnight on the 1st of each month).

4.4.2In the event of a power outage in the energy meter, all data related to settlement shall be saved10Year, save other data3Year.

4.5 Freezing function

4.5.1 Month Freeze: Freeze electric energy data according to the set settlement time and interval, and store the data frozen in the last 12 months.

4.5.3 Daily Freeze: Stores the electrical energy at midnight every day and can store the latest 31 days of frozen data.

4.6 Cost control function

1)The electricity meter calculates the electricity bill in real-time based on the amount of electricity and deducts it. When the remaining amount in the meter is not

When sufficient, it can automatically power off; The electricity meter can be recharged through the management system's remote or local infrared remote control card; The electricity payment method is flexible and supports monthly, annual, or time of use electricity prices.

2)Monthly subsidy for electricity can be set, with priority given to using the subsidy for electricity meters and a limit on the subsidy amount

Used within the current month, cannot be accumulated to the next month.

3)Support overdraft function, allowing users to continue using electricity until overdraft even when their balance is zero

Until the amount is used up, the overdraft amount will be automatically deducted for the next electricity purchase.

4.7 Identification of malignant loads

Equipped with malignant load recognition function, it can identify high-power resistive loads such as electric furnaces and rapid heating, and automatically trip to limit the use of such loads; And save the records of the last 10 malignant load events.

4.8 Load learning function

By collecting the characteristic quantities of malignant loads, performing calculations, and writing the calculated characteristics into the electricity meter, the meter can allow the use of this malignant load.

4.9 Time period control function

Trip (or close) at the set time point, disconnect (or put into operation) the power supply circuit, and achieve automatic reclosing (or tripping).

4.10 Overvoltage protection and power control function

When the voltage exceeds the set value or the load power exceeds the set value, it can automatically trip and close after a certain delay time (adjustable).

4.11 Power protection function

When the energy meter is in the power on state, it does not perform the tripping operation caused by time period control, temperature control, and cost control until the power on state is released. Support command power protection, time period power protection, night power protection, and network fault power protection.

4.12 Arc extinguishing function

The use of a dynamic zero crossing action device for switching power supplies eliminates the damage caused by arcing when the relay is loaded and closed, greatly improving the service life of the product. This technology has obtained national patents.

4.13 Clock

Adopting a built-in hardware clock circuit with temperature compensation function, featuring calendar, timing, and automatic leap year conversion functions; The output frequency of the internal clock terminal is 1Hz. Within the temperature range of -25 ℃ to+60 ℃, the clock accuracy is ≤± 1s/d; At a reference temperature of 23 ℃, the clock accuracy is ≤± 0.5/s/d.

4.14 Pulse output

The electric energy meter has LED pulse indication and pulse signal output functions proportional to the measured electrical energy, and the output characteristics of the pulse signal comply with the requirements of GB/T17215.211-2006.

4.15 Display

4.15.1 Using an LCD display to display energy meter data:

1) The battery display format is: integer 6 digits+decimal 2 digits,electricitytablePress the button when chargedLCD jumps toNext screen, simultaneously activate backlight, no operation30sAutomatically close afterwardsBacklight.

2) The energy meter uses high brightness, long-life LEDs as indicator lights.

① Pulse indicator light: red, flashing when there is power output.

② Pull off indicator light: yellow, when the relay is pulled off, the indicator light is on.

4.15.2The energy meter displays various values such as electrical energy, voltage, current, power, time, etc; The displayed numerical units adopt the national legal measurement units, such as:kWThekWhTheVTheAPlease refer to Appendix 1 for specific display items;

4.15.3Display symbols include power direction, programming status, battery undervoltage, and other indicators;

4.15.4Display code includes display content encoding and error code; Please refer to the appendix for the display code１－２；

4.15.5It has the function of waking up display after power outage. After the electricity meter loses power, the LCD will automatically turn off. Press the button to wake up the LCD, and press the button to jump to the next screen after waking up; After waking up, there is no button action, and the LCD will be turned off after 30 seconds.

4.16safety protection

The energy meter is equipped with programming password protection measures to prevent unauthorized personnel from performing programming operations. The energy meter can only be programmed in the allowed programming state, and the reading operation is not controlled by the programming switch.

4.16.1Programming switch

1) This table is for softwareProgramming switch, and setting operations can only be performed after enabling programming.

2)In programmable state, if240If there is no operation within minutes, the energy meter will automatically turn off the programming state.

4.16.2Programming password

The energy meter needs to be verified with a programming password before programming or other special operations can be performed.

1) Passwords are managed in two levels, with each level consisting of6Composed of Arabic numerals; Different password permission levels result in different operations that can be performed.

2) Personnel with high-level password permissions can modify low-level passwords and perform all operations related to low-level passwords.

4.17 Communication

The electric meter has RS485, infrared GPRS、NB-IoT has four communication functions. The physical layer of the communication channel is independent, and any damage to one communication channel will not affect the normal operation of other channels; Communication protocol complianceDL/T645-2007、DL/T645-1997。 RS485The interface communication rate can be set，The standard speed is1200bpsThe2400bps、4800bps、9600bps，The default value is2400bps。

Infrared communicationThe communication rate is1200bps.

5. Product installation

5.1 Installation

The electric energy meter should be installed indoors for use. There is a hook screw hole on the upper end of the base of the electric energy meter, which can be fixed with hook screws; There are two mounting holes at the bottom of the electric energy meter, which can be fixed to the terminal block with screws; The base plate for installing the electric energy meter should be placed on a sturdy and fire-resistant wall, and it is recommended to install it at a height of about 1.8 meters. The installation dimensions of the electric energy meter are shown in the following figure:

5.2 Wiring

The electric energy meter should be wired according to the wiring diagram on the terminal box, preferably with copper wire or copper wire ends.

5.3 Testing

This series of electric energy meters are equipped with photoelectric coupling test output ports, located at the wiring terminals, as indicated by c and e in the figure. The wiring method is as follows:

6. Transportation and Storage

The transportation of electric energy meters should not be subjected to severe impacts and should be based onGB/T13384General Technical Conditions for Packaging of Mechanical and Electrical ProductsRegulations on transportation and storage.

Inventory and storage should be placed on racks in their original packaging conditions, with a stacking height of no more than five layers. The storage area should be clean, with an ambient temperature of -40 to 70 ℃, a relative humidity of no more than 85%, and free from harmful substances that can cause corrosion in the air.

7. Warranty period

Within 18 months from the date of manufacture, if the electric energy meter does not meet the requirements specified in the technical regulations, the company will provide free repair or replacement if the user complies with the instructions, uses it correctly, and the manufacturer's lead seal is still intact.

Product damage caused by the following reasons is not within the scope of replacement:

1)Damage caused by not operating according to the instructions;

2)Damage caused by unauthorized disassembly or repair by users, and other human caused damages.

8. Precautions:

8.1 This product has been inspected and qualified before leaving the factory, and is sealed with lead. When using, please follow the wiring diagram on the end cap (the power supply inlet and outlet cannot be reversed). Add terminal lead seal after wiring.

During installation and use, all terminals must be properly connected and tightened.

8.3 The electric energy meter should be installed in a ventilated and dry indoor area, and the base plate for installing the electric energy meter should be fixed on a sturdy, fire-resistant, and vibration resistant wall. The electric energy meter should be installed vertically.

8.4 The working environment of the electric energy meter should have lightning protection measures.