Overview
The ADF400L series multi-user energy meter is a high-performance metering device specifically designed for centralized installation and tenant sub-metering.
Utilizing a modular and combinable structure, it flexibly integrates a main module with direct-connect or transformer-connect metering modules.
A single unit can simultaneously meter up to 12 three-phase circuits or 36 single-phase circuits, and can also handle mixed configurations of direct and transformer connections.
The series features prepayment functionality supporting remote or RFID card recharging, and is widely used in residential complexes, schools, commercial buildings, and enterprises requiring centralized power management.
Highlight
Modular Design, Flexible Configuration
- A single unit integrates up to 36 single-phase or 12 three-phase circuits, supporting mixed direct and transformer connections for various scale requirements.
Prepayment & Multiple Controls
- Supports four control modes—balance cutoff, scheduled cutoff, overload identification, and forced cutoff—for refined power management.
Integrated Installation, Simplified Wiring
- All circuits centrally installed with internal bus communication, significantly reducing on-site labor and maintenance costs.
Rich Communication Interfaces
- Standard infrared, up to 3 RS485 ports Modbus protocol, optional Ethernet for easy integration with EMS.
Function
| Function Category | Description |
| Energy Metering | Total active energy, forward/reverse active energy, multi-tariff active energy; reactive energy (metering version). |
| Electrical Measurement | Voltage, current, active power, reactive power, apparent power, power factor, frequency. |
| LCD Display | 8-segment LCD with backlight, cyclic display of energy, parameters, alarms, etc. |
| Key Programming | On-site programming of communication parameters, circuit count, phase mode, external control mode via keys. |
| Pulse Output | Each three-phase metering module provides one active energy pulse output; configurable pulse constant. |
| Multi-tariff | Supports 4 time zones, 2 tariff schedules, 14 daily time periods, 4 tariffs (peak, flat, off-peak). |
| Prepayment Protocol | Tariff control (forward & reverse active energy), time control, load control (malicious load identification), forced control. |
| Recharge Records | Stores last 20 recharge transaction records. |
| Digital I/O | Main module: 2DI+2DO (dry contact); Transformer-connect module: 2DI+4DO (DI 220V wet contact). |
| Communication | Infrared; up to 3 RS485 ports (Modbus-RTU; optional Ethernet. |
| Historical Energy | Last 12 months historical energy data storage (metering version). |
| Harmonics & Unbalance | Total harmonic distortion, 2nd–31st individual harmonics, voltage/current unbalance (metering version). |
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Specification
| Parameter | Specification |
| Auxiliary Power | Voltage: 3×220/380V (short terminals 1,2,3 for single-phase) Power consumption: ≤10W |
| Voltage Input | Rated voltage: 3×220/380V, 3×57.7/100V Reference frequency: 50Hz Accuracy: ±0.2% |
| Current Input | Direct connect: 0.1-0.5(80)A (GB/T 17215.321-2021) Transformer connect: 0.015-0.075(6)A (GB/T 17215.321-2021) Accuracy: ±0.2% Starting current: Direct 4%Itr, CT 2%Itr |
| Power Measurement | Active, reactive, apparent power accuracy: ±0.5% |
| Measurement Performance | Accuracy class: Class C Clock accuracy: ≤0.5s/d |
| Pulse Output | One active energy pulse per three-phase module Pulse width: 80ms±20ms Pulse constant: CT type 6400 imp/kWh, direct type 400 imp/kWh |
| Digital I/O | Main module: 2DI (dry) + 2DO Transformer-connect module: 2DI (220V wet) + 4DO |
| Communication | Infrared port RS485: Modbus-RTU, DL/T645-07 Ethernet (optional): Modbus-TCP, TCP/IP |
| Environment | Operating temperature: -25℃～+55℃ Storage temperature: -40℃～+70℃ Humidity: ≤95% RH, non-condensing Altitude: ≤2000m |
| Installation | 35mm DIN rail Torque: direct ≤3N·m, CT ≤0.5N·m |
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Selection Guide
Model code example: ADF400L-5H2S5DY
- H: Number of transformer-connected 3-phase circuits (max 12, must be even)
- S: Number of direct-connected 3-phase circuits (max 12)
- D: Number of direct-connected single-phase circuits (max 36)
- Y: Prepayment type (omitted for metering type)
- Options: IC (RFID card), CE (Ethernet), K (digital I/O), *C (up to 3 RS485 ports)
Configuration principle: One main module supports up to 36 circuits (1 three-phase = 3 single-phase). For example, 5 transformer-connected circuits (count as 6), 2 direct 3-phase circuits, 5 direct single-phase circuits: total circuits = 6×3 + 2×3 + 5 = 29 ≤36, model = ADF400L-5H2S5DY, requiring 3 transformer modules, 2 three-phase direct modules, and 2 single-phase direct modules.
Summary
The ADF400L series multi-user energy meter provides an integrated solution for centralized multi-circuit metering and prepayment management with its modular design and highly integrated functionality. It consolidates metering, monitoring, and control for up to 36 single-phase or 12 three-phase circuits into a single unit, significantly simplifying on-site wiring, reducing installation costs, and saving valuable distribution space. Supporting multiple control modes (prepayment, time control, load control, forced control) and flexible communication options (RS485, infrared, Ethernet), it can be easily integrated into various energy management systems to meet the refined power management needs of residential complexes, schools, commercial buildings, and more. Strictly complying with national standards, this series ensures high measurement accuracy, reliable operation, and is an ideal choice for users aiming to achieve intelligent power management and improve operational efficiency.
FAQ
After power-up, press the second button on the main module to scroll through user numbers. Check for error codes below the number. No display means normal; Err1, Err2, Err3 indicate address error, type mismatch, or missing module. Check wiring and module order.
Two alarm thresholds can be set. When remaining energy falls below alarm1, LCD shows “Please purchase”. Below alarm2, the meter automatically trips. Reclosing delay can be set 0-255s (255 = no auto-reclose). If overdraft exceeds limit, power is also cut.
Supports Modbus-RTU and DL/T645-07. Address, baud rate, and parity can be set via keypad programming menu. For Ethernet models, IP address, gateway, etc., must also be configured.
Direct-connect modules support up to 80A. Terminals must be tightened securely with torque ≤3N·m, and ensure neutral wire is properly connected (the two N terminals are internally connected).
Fuses connected to terminals 44 and 47 should have voltage rating higher than system voltage and current rating of 3-5A to protect the control circuit.
