1、 Overview

The DTSF1332 three-phase four wire electronic multi rate energy meter is designed using advanced energy metering chips and reliable MCU circuits. It is an internationally advanced energy metering instrument manufactured using digital processing technology and advanced SMT production processes. The DTSF1332 three-phase four wire electronic multi rate energy meter can record the energy consumed by users in different time periods according to the set multiple rate parameters. Set parameters and read/write data to the electricity meter locally or remotely through an infrared programmer or RS485 interface. Establish long-distance power parameter collection through RS485 data network. Users can view the relevant parameters in the electricity meter through the LCD display. All parameters and performance indicators fully comply with the following technical standards.

2、 Specifications and technical indicators

2.1 Rated voltage: 3 × 100V, 3 × 380V

2.2 Rated frequency: 50Hz

2.3 Basic current: 1.56A, 520A, 1040A, 1560A, 2080A, 30 (100) A

2.4 Meter constant: Refer to the corresponding nameplate markings.

2.5 Accuracy level: Level 1

2.6 Starting current: 0.4Ib (1.0 level), 0.5Ib (2.0 level)

2.7 Stealth: With anti creep logic design, the voltage circuit is rated at 115, and when there is no current in the current circuit, the meter does not generate more than one pulse output.

2.8 Clock Parameters

Clock accuracy (daily error): ≤ 0.5s（23℃）

Battery capacity: ≥ 1Ah

Data retention time after power outage: ≥ 10 years

2.9 Voltage Range

Normal operating voltage: 0.7Un~1.2Un

Maximum operating voltage: 0.0Un~1.2Un

2.10 Power consumption (LCD)

Voltage line power consumption: ≤ 1.0W and 5VA

Current line power consumption: ≤ 1VA（Ib）

2.11 Climate conditions

Normal operating temperature:- 15℃～+55℃

Extreme working temperature:- 20℃～+70℃

Storage and transportation temperature:- 25℃～+70℃

Humidity: ≥ 95 (30 days in a year (spreading naturally)

2.12 Weight: Approximately 2kg

2.13 Average lifespan: ≥ 10 years

3、 Working principle

3.1 The working principle and process are shown in Figure 1.

When the electric energy meter is working, the energy consumed by the user is converted into voltage and current signals. After being sampled by the sampling circuit, they are processed by the dedicated integrated circuit of the electric energy meter into pulse signals proportional to the power consumption. The MCU records the power pulse and stores it. Process and record the electricity consumption during the corresponding time period based on the clock and time slot content. The LCD displays the parameters selected by the user in a loop, and the stored information data can be transmitted through an infrared meter reading machine or RS485 communication interface.

4、 Basic functions:

4.1 Measurement function

4.1.1 Measuring positive and negative active energy; (Reverse energy is accumulated based on forward energy). After power failure, the data is saved in EEPROM, and the power failure data is kept for more than 10 years;

4.1.2 Store energy data for 13 months, including this month, at various rates; The data transfer boundary time is set to the automatic meter reading date.

4.2 Time Period and Rate Function

4.2.1 Use a hardware clock circuit with built-in crystals and a temperature compensation circuit. Automatically adjust time, date, and leap year automatic switching function within the effective time of 2099 to ensure clock error within 30s/month.

4.2.2 Programmable setting of peak, flat, and valley rates for 12 time periods. The default setting is 3 rates, 5 time periods (in accordance with Jiangsu time period requirements), with a minimum interval of 30 minutes between time periods, and time period settings can cross zero. The actual start and end time of any time period shall not deviate from the preset time by more than 5 seconds.

4.3 Display and Monitoring

4.3.1 6-digit LCD display, the energy meter displays a 5-digit integer plus 1 decimal place (it can also be set to a 5-digit integer and then display 2 decimal places), and the data is displayed in a loop.

4.3.2 It can display the current date, time/total, peak, off peak, and valley electricity levels. LCD cycle display: After the electricity meter is powered on, the date, time, current total, current peak, current flat, current valley, the station number of the electricity meter, and the operating period (peak, flat, valley) always participate in the cycle display; The rest will be displayed according to the set display selection. The default display interval of the electricity meter is 10 seconds.

4.5 Communication Function

4.5.1 Infrared communication interface: communication distance ≥ 4m, communication angle: ≥ ±15o

4.5.2 RS485 communication: baud rate 1200bps/s, half duplex, RS485 communication line isolated from the circuit in the meter, communication distance: 1200m. Electrical parameters comply with DL/T645-97 standard;

4.3.2 The running status words in the table can be remotely read through RS485;

4.6 Programming Functions

4.6.1 Programming Control

When programming an energy meter through an infrared communication port or RS485 communication interface, the meter uses hardware switches and software passwords to restrict programming operations. When the programming switch is set to 'programming enabled', various programming can be performed on the electricity meter. When the programming switch is set to 'programming disabled', only projects that comply with regulations (detailed projects can be found in 'DDSF1332 Single phase Electronic Multi rate Energy Meter Communication Protocol and Software Programming Operations') can be operated, and meter reading operations are not controlled by the programming switch.

4.6.2 Programming Content

The programming content includes the following 6 items: time, date, rate period, meter address, display mode selection, and minimum electricity quantity. The above six items can be set separately or set up all at once through "Comprehensive Programming".

4.6.3 Programming check

All programming content can be read back and checked through an infrared meter reading machine or RS485 interface;

5、 Installation and use

Before installing and using the new table, it is recommended to change the programming password and reset the password. Users must remember to change their password, otherwise they will not be able to set up the electricity meter. When the electric energy meter leaves the factory, there are two reset opportunities left for the power supply company without opening the meter cover.

5.2 The electric energy meter should be installed indoors or outdoors in a rainproof meter box, which should be fixed on a sturdy and fire-resistant wall. It is recommended to install it at a height of no less than 2 meters. There are no corrosive gases in the air.

5.3 The electric energy meter should be wired according to the wiring diagram on the terminal cover, preferably using copper wire or copper connectors, and all wiring screws should be tightened.

5.4 The external dimensions and wiring diagram are shown in the following figure:

Dimensions: Length x Width x Height=228.5mm x 144mm x 73mm