Product Core Brief

• Model: AGC/GS/3 (Full series name AGC-3 GS variant)
• Brand: DEIF (Denmark, professional power generation control brand)
• Series: AGC-3 high-end paralleling genset controller platform
• Core Function: Fully automatic control for single/multiple generator sets; realize auto start/stop, mains parallel, genset paralleling, load sharing, mains fail backup, full electrical & engine protection, data monitoring & remote communication
• Product Type: Microprocessor-based PLC programmable genset master controller
• Key Specs: Supports 50/60Hz 90–480V 3-phase; multi-unit synchronous paralleling; CAN power management bus; RS485 Modbus RTU; built-in PLC logic editor
• Note: New original OEM; matched HMI display modules, CT transformers and communication accessories sold separately

 

Key Technical Specifications

Electrical Input

1. Generator voltage: 90–480V AC 3-phase, 45–65Hz auto detection
2. Mains bus voltage: same range as generator
3. Current CT input: 0.5/5A secondary standard
4. Auxiliary supply: 12/24V DC engine battery wide range
5. Speed pickup: Magnetic pickup 0–3600 RPM compatible

Control & Output

• Relay outputs: Multi configurable NO/NC relays for breaker, alarm, governor, AVR control
• Analog I/O: 4–20mA / ±25mA analog outputs for governor speed & AVR voltage regulation
• PLC function: Onboard free logic programming for custom interlock & process logic

Communication Interfaces

1. RS485: Modbus RTU (SCADA/HMI remote monitoring)
2. PM CAN bus: Redundant CAN for multi-generator load sharing & synchronization
3. USB front port: Local parameter upload/download, firmware upgrade
4. Optional Ethernet module for TCP/IP remote access

Environmental & Mechanical

• Protection class: Front panel IP54, rear terminal IP20 (cabinet installation)
• Operating temperature: -20°C ~ +70°C; storage -40°C ~ +85°C
• Humidity: 5%–95% RH non-condensing
• Dimensions: 261mm (W) × 172mm (H) × 100mm (D); weight ~1.5kg
• Mount: Standard cabinet cutout flush mounting

Protection Functions (Full ANSI standard)

Over/under voltage, over/under frequency, reverse power, overcurrent, short circuit, overload, engine overspeed, low oil pressure, high coolant temp, battery low, loss of excitation, earth fault protection

 

Product Introduction

The AGC/GS/3 is DEIF’s flagship paralleling genset controller, designed for critical power scenarios including data centers, hospitals, marine vessels, oil & gas, factory backup power plants.

1. Mains parallel & island mode dual support: Auto transfer between grid and genset; seamless closed transition synchronization without load drop.
2. Multi-generator parallel load sharing: Up to dozens of gensets synchronous operation, active/reactive power equal distribution via CAN bus, eliminate circulation current.
3. Built-in PLC logic: Users can customize interlock logic without additional external PLC, simplify cabinet wiring and reduce hardware cost.
4. Complete monitoring & alarm log: Real-time display voltage, current, power factor, kW/kVar, engine temp, oil pressure, running hours; store thousands of historical fault records for maintenance traceability.
5. Wide compatibility: Works with diesel, natural gas, biogas generator engines; match all electric governor and AVR brands.

 

QA & Testing SOP

1. Incoming Inspection: Verify DEIF original serial number anti-counterfeit label; inspect front LCD screen, terminal spring pins, USB/CAN port integrity, no PCB corrosion or bent pins.
2. Bench Function Test: Supply 24V DC auxiliary power, connect 3-phase simulated voltage source and CT signal; test auto start sequence, mains loss transfer, synchronization logic, all protection trip points, Modbus communication data readout, PLC logic execution.
3. Paralleling Simulation Test: Link two AGC/GS/3 via PM CAN bus; simulate load fluctuation to verify active/reactive load balance error within ±2%.
4. Firmware & Parameter Backup: Export factory default parameter set via DEIF Utility Software; photograph terminal wiring definition for replacement matching.
5. Final Packaging: ESD anti-static bag sealed, equipped with test report recording all protection trip values, serial number and 24-hour continuous operation log.

 

Installation Pitfalls & Operation Guide

❗ CAN Bus Daisy-Chain Termination Risk: PM CAN bus must install 120Ω terminal resistor at the first and last controller; missing termination causes communication jitter, load sharing imbalance, genset unstable synchronization.❗ CT Wiring Polarity Reversal: Incorrect CT wiring leads to reverse power false alarm, parallel unit circulation current, breaker accidental trip. Strictly follow terminal polarity marking.❗ Separate Power & Signal Cable Routing: Route high-current breaker power cables far away from CAN/Modbus low-signal wiring; EMI noise distorts synchronization signal and triggers random protection alarms.❗ Improper DC Auxiliary Power: Do not share battery charging alternator unstable power directly; add filter diode to avoid voltage surge burning internal CPU board.❗ ESD Damage Risk: Touch grounded anti-static wristband before plugging/unplugging CAN/USB communication ports; static discharge damages communication transceiver chips.

4-Step Replacement Guide

1. Pre-install lockout: Cut off genset DC battery power, disconnect mains & generator high-voltage circuit breaker; photograph all terminal wiring, CAN bus daisy chain layout, CT polarity connection.
2. Removal: Unplug all green terminal blocks, release cabinet mounting clips, extract old controller from cutout frame.
3. Installation: Flush mount new AGC/GS/3 into cabinet cutout; rewire all terminals strictly per photo record; install CAN bus terminal resistor at both bus ends.
4. Commissioning Test: Restore DC auxiliary power; upload original parameter file via USB; simulate mains failure, single genset auto start, multi-unit parallel load test; confirm all protection functions trigger normally before putting into production.

 

FAQ

Q1: What is the difference between AGC/GS/3 and standard single-unit AGC controller?A: GS suffix stands for Grid Synchronization & Genset Paralleling, supporting multi-machine parallel and mains closed transition; basic AGC models only support single genset mains backup without paralleling function.

Q2: How many generators can AGC/GS/3 synchronize together?A: Unlimited quantity via PM CAN bus daisy chain; actual engineering stable parallel up to 32 gensets with precise load sharing.

Q3: Can it realize mains closed transition parallel switch?A: Yes, built-in synchronization algorithm automatically match voltage, frequency, phase angle; closed transition transfer avoids power interruption for sensitive loads like servers.

Q4: Does AGC/GS/3 support remote cloud monitoring?A: Native RS485 Modbus; optional Ethernet communication module upload data to SCADA, cloud platform or remote HMI system.

Q5: Can I edit custom logic without extra PLC?A: Yes, onboard free PLC programming function via DEIF PC software; customize engine interlock, fault delay logic, sequence control without external hardware.

Q6: What warranty applies to original DEIF AGC/GS/3 spare parts?A: Standard 12-month factory warranty covering CPU, analog measurement circuit, CAN communication modules; damage from wrong wiring, ESD mishandling, overvoltage surge and ungrounded installation is excluded.