Description

The DEIF TAC-311DG is a high-performance automatic synchronizing and load-sharing controller designed for parallel operation of up to 32 generator sets in marine,industrial,and backup power applications.As part of DEIF’s TAC(Turbine&Alternator Controller)series,it provides precise voltage,frequency,and phase matching before closing the circuit breaker—ensuring smooth,shock-free synchronization to the bus or grid.With built-in kW/kVAR load sharing,droop compensation,and dual CAN communication,the TAC-311DG serves as the intelligent core of modern power management systems(PMS).

Application Scenarios

At an offshore oil platform in the North Sea,frequent blackouts occurred during generator switchover due to manual synchronization errors under harsh weather conditions.After upgrading to the DEIF TAC-311DG,the platform achieved fully automatic,bumpless transfers between three 2.5 MW diesel gensets—even during crane operations drawing dynamic loads.The controller’s fast vector tracking algorithm synchronized units in under 3 seconds,while its real-time kW/kVAR balancing prevented circulating currents.Over 18 months,unplanned outages dropped to zero,and fuel consumption decreased by 7%through optimized load distribution—proving the TAC-311DG’s value in safety-critical,remote environments.

Parameter

Main Parameters Value/Description

Product Model TAC-311DG

Manufacturer DEIF A/S(Denmark)

Product Category Automatic Synchronizer&Load Sharing Controller

Max.Generators Supported Up to 32 in parallel(via daisy-chained CAN bus)

Synchronization Method Fast vector tracking with adjustable closing window(±0.2°phase,±0.05 Hz freq)

Voltage Input Range 3-phase:57–690 VAC(PT optional);1-phase:100–400 VAC

Frequency Range 50/60 Hz(auto-detect),45–70 Hz operational

Load Sharing True kW/kVAR control with adjustable droop(0–10%)

Communication Interfaces Dual CAN bus(DEIF proprietary),RS-485(Modbus RTU),optional Ethernet(with add-on)

Protection Functions Reverse power,overload,under/over voltage/frequency,loss of excitation

Compliance&Certifications IEC 60068,IEC 61000-6,UL 1008,DNV-GL,ABS,LR,BV,CCS

Mounting Standard DIN rail(35 mm)

Operating Temperature-25°C to+70°C

Display&Interface Backlit LCD with keypad;configurable via front panel or PC tool(TAC Configurator)

Technical Principles and Innovative Values

In Innovation Point 1:Vector-Based Fast Synchronization–Unlike traditional slip-frequency methods,the TAC-311DG uses real-time phasor calculation to predict the exact moment for breaker closure—reducing sync time to<3 seconds and minimizing mechanical stress on couplings and switchgear.

Innovation Point 2:True kW/kVAR Decoupled Control–By independently regulating active(kW)and reactive(kVAR)power via engine governor and AVR signals,the TAC-311DG eliminates cross-coupling errors that cause instability in older isochronous/droop systems.

Innovation Point 3:Dual CAN Redundancy–Two isolated CAN buses allow daisy-chained communication between generators without single-point failure risk—critical for marine DP(Dynamic Positioning)and hospital backup systems.

Innovation Point 4:Grid-Friendly Black Start Capability–In island mode,the TAC-311DG can form a stable bus from a dead system(“black start”)and sequentially synchronize additional units—ideal for microgrids and remote mines.

Application Cases and Industry Value

A data center in Singapore deployed four 3.2 MW standby generators protected by legacy synchronizers prone to“beat”oscillations during load swings.After retrofitting with DEIF TAC-311DG controllers,the facility achieved seamless transitions during utility outages,with zero IT interruptions over two years.The system’s Modbus RTU interface also enabled integration into the BMS for real-time fuel usage reporting.Total ROI was achieved in 14 months through reduced maintenance,lower fuel burn,and avoided downtime penalties—showcasing the TAC-311DG as both a reliability and sustainability enabler.

Related Product Combination Solutions

DEIF AGC-4/AGC-5:Higher-end PMS controllers for complex multi-source grids(solar+genset+battery).

DEIF AVR-2000:Automatic Voltage Regulator that pairs with TAC-311DG for closed-loop kVAR sharing.

DEIF MPM-300:Multi-function protection relay for busbar and feeder monitoring in the same panel.

DEIF TAC Configurator Software:PC tool for advanced setup,trending,and firmware updates.

Cummins PowerCommand 3.2+:Competitor system—TAC-311DG often used as cost-effective alternative with open protocols.

ABB Emax 2 Circuit Breakers:Commonly paired with TAC-311DG via shunt trip/coil interfaces.

DEIF CAN-IO Module:Expands digital/analog I/O for auxiliary control(cooling,alarms,etc.).

Schneider Electric EcoStruxure:Can ingest TAC-311DG data via Modbus gateway for enterprise energy dashboards.

Installation,Maintenance,and Full-Cycle Support

Installation of the DEIF TAC-311DG requires connection to generator voltage/current transformers,engine actuator(via 4–20 mA or PWM),AVR field control,and circuit breaker status inputs.Wiring follows IEC 60204 standards,with shielded cables for analog signals.Configuration begins with auto-detection of generator rating,followed by tuning of sync windows,droop curves,and protection thresholds using the front panel or TAC Configurator software.

Routine maintenance includes annual verification of sync timing using a power quality analyzer and inspection of terminal torque(recommended:0.6 Nm).Firmware updates are delivered via USB or serial port to add features or address grid code changes.We supply new,factory-sealed TAC-311DG units with full documentation and offer commissioning support—including sync performance validation and load bank testing.

Note:The TAC-311DG is widely used as a direct replacement for obsolete GAC SCS9400 or ComAp InteliSys modules,thanks to its flexible I/O and open communication protocols.

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