DTSFU1226 Three-phase Four-wire Instrument Transformer Type Multi-rate Energy Meter

Product Introduction

DTSFU1226 Overview
The DTSFU1226 Three-Phase Four-Wire Electronic Multi-Tariff Energy Meter utilizes large-scale integrated circuits and incorporates a high-precision, dedicated energy metering chip. Integrating digital sampling and processing technologies with SMT manufacturing processes, and designed and manufactured to suit actual user electricity consumption scenarios, it is an energy metering instrument representing the pinnacle of modern advanced technology.

Core Functional Features

Precise Metering Capabilities

• Features an embedded high-speed, high-precision AC voltage and current acquisition module, ensuring high sampling accuracy for real-time, precise energy metering;

• Capable of metering total active energy, total reactive energy, per-phase energy, and demand; supports historical energy recording, instantaneous value reading, and load profile recording/retrieval;

• Covers total and per-phase energy metering for both forward/reverse active energy and forward/reverse reactive energy;

• The maximum demand period can be flexibly selected from 60, 120, 300, 600, 900, or 1200 seconds.

Clear Display Capabilities

• Utilizes a Liquid Crystal Display (LCD) screen for clear and intuitive visual presentation;

• Supports automatic parameter cycling; the specific parameters, display duration, and sequence can be freely configured;

• Equipped with a button-activated display function, allowing for custom configuration of the displayed content and sequence;

• Includes a built-in backlight function that activates upon button press, facilitating easy viewing in dimly lit environments.

Stable Communication Capabilities

• Features a built-in RS485 interface with a default baud rate of 9600 bps, adjustable within the range of 1200 bps to 19200 bps;
• The RS485 interface is electrically isolated from the meter's internal circuitry and incorporates lightning protection circuits to ensure secure and stable communication;
• Compatible with both the MODBUS communication protocol (referencing GB/T 19582.1-2008) and the DL/T 645-2007 communication protocol, making it suitable for a wide variety of industrial automation scenarios.

Output Capabilities

• Provides an active energy test pulse output function;

• Supports remote pulse output, with the remote pulse constant configurable according to specific requirements.

Intelligent Multi-Rate Function

• Up to 4 rates can be configured to meet electricity billing requirements for different time periods;

• Supports two sets of rate schedules, enabling automatic switching to adapt to complex electricity usage scenarios;

• Each rate schedule set allows for the configuration of up to 14 time zones within a one-year period, with a total of 8 selectable time-of-use (TOU) tables available;

• Each TOU table supports up to 14 daily time intervals within a 24-hour cycle, with a minimum interval duration of just 15 minutes;

• Supports the configuration of up to 254 holiday periods, closely aligning with actual electricity billing scenarios.

Comprehensive Event and Data Logging Functions

• Real-time measurement of RMS values ​​for 3-phase (A, B, C) voltage, current, and power, as well as current frequency;

• Features logging capabilities for abnormal events such as overvoltage, overload, and overcurrent, with anomaly thresholds configurable as needed;

• Load profile recording intervals can be configured between 15 minutes and 120 minutes (default: 15 minutes); supports up to 192 load data points, covering voltage, current, frequency, total active energy, and total reactive energy;

• Supports daily data freezing (storing up to 62 records) and scheduled data freezing (storing up to 60 records); frozen data includes total active energy, total reactive energy, and frequency.

Key Technical Specifications

Dimensions and Installation Instructions

Physical Structure

The product features a compact physical design and primarily consists of components such as mounting lugs, a lead-seal point, a hinged cover, Up/Down navigation buttons, a display area, a CT/PT ratio label (sealable), and a test pulse output terminal. The front panel is equipped with red LED indicators for active and reactive energy; the pulse output indicator utilizes a toggle-flip mechanism, remaining unlit upon initial power-up.

The LCD screen clearly displays information such as measurement units, measured values, tariff rates, phase status, power direction, and OBIS codes. The phase status indicator provides real-time feedback on the voltage condition of each individual phase (no display indicates a phase loss; a 1 Hz flash indicates overvoltage or undervoltage; and a 2 Hz flash indicates reverse phase sequence or reverse polarity).

Installation Requirements

• Installation Location: The device must be installed indoors in a well-ventilated and dry environment to ensure safe and reliable operation. If the installation site is subject to excessive contamination or physical damage risks, a protective enclosure must be utilized.
• Installation Method: Standard DIN-rail mounting. All wiring connections must be performed in strict accordance with the product's wiring diagram.

Precise Metering, Intelligent Management-The DTSFU1226 Energy Meter: Safeguarding Your Power Management Needs!