Product Introduction

The Basler DECS-100 is the world’s best-selling digital AVR because it packs a 5 MW-capable brain into a lunch-box-sized, fully potted brick that shrugs off 60 °C desert heat and –40 °C Arctic nights. Launched in 2001 as Basler’s fifth-generation microprocessor exciter, the Basler DECS-100 instantly retired analog rheostats on everything from 500 kW diesel gensets to 5 MW hydro turbines. One quarter-turn quick-connect terminal block, one RS-232 port, and the free BESTCOMS wizard turn a 3-hour commissioning nightmare into a 12-minute coffee break.

At its core, the Basler DECS-100 fires 7 A continuous into any shunt, PMG, or auxiliary-wound field while four operating modes—AVR, FCR, VAR, and PF—let a single unit engine island, parallel, or droop-share with the grid. The patented Auto-Tune PID wizard watches your machine’s first ramp, calculates optimum gains in 8 seconds, then locks them into non-volatile EEPROM. No more oscilloscope dances; just press “TUNE” and watch terminal voltage settle within 0.25 %.

Twenty-five years later, the Basler DECS-100 still ships 4,000 units a year because the same 2001 firmware runs on Windows 11, still passes UL/CSA/CE, and still costs less than a new iPhone. One Basler DECS-100, one lifetime of flicker-free power.

Core Advantages and Technical Highlights

7 A Continuous / 10 A Forcing in a Potted Brick

The Basler DECS-100 squeezes a 1,200 W IGBT bridge into a 51 mm thick epoxy block that survives 10 g vibration on mobile crusher gensets. No fan, no dust, no derate: full 7 A from –40 °C to +60 °C. When the grid collapses, 135 V / 10 A forcing slams the rotor in 0.8 s—restoring voltage before the PLC even sees a dip.

Four Control Modes, Zero Code

Switch from AVR to PF control with one contact closure. Islanded hospitals run AVR; paralleled peak-shavers run VAR; co-gen plants run PF—all from the same Basler DECS-100. Droop, line-drop, and cross-current compensation are DIP-switch simple, yet BESTCOMS lets you curve-shape each mode for non-linear LED lighting loads.

Auto-Tune PID + Real-Time Metering

Press the front-panel “TUNE” button and the Basler DECS-100 injects a 2 Hz dither, measures time-constant and gain margin, then writes perfect PID numbers in 8 s. Live oscilloscope screens in BESTCOMS show field volts, amps, VARs, and watts to 0.1 %—no external meters required.

Five Limiters in One Chip

Soft-start ramps field current in 2–30 s to protect lamp filaments. Under-excitation (UEL), over-excitation (OEL), stator current (SCL), and V/Hz limiters run in parallel, each with independent time delays. A single Basler DECS-100 replaces five analog relay cards.

Voltage Matching Before Breaker Close

Close-angle prediction plus 0.5 % matching accuracy lets the Basler DECS-100 sync a 4 MW turbine to the utility in 3 seconds flat. No external synchronizer needed; just wire 52C auxiliary contacts to the “VM” input.

Typical Application Scenarios

Remote Alaskan micro-grids pair a Cat 3516 with a Basler DECS-100 in VAR mode to absorb wind gusts. When the 900 kW turbine spikes, the diesel instantly drops 400 kVAR in 180 ms—keeping village lights rock-steady without battery banks.

Brazilian sugar mills run 3 MW bagasse boilers 24/7. The Basler DECS-100’s OEL limiter caps field current at 105 % for 90 s during crusher starts, then auto-resumes 100 %—preventing $28 k rotor burns every harvest.

Offshore platforms retrofit 2.5 MW emergency diesels in 4 hours: remove the old carbon-pile regulator, bolt the Basler DECS-100 to the same four holes, copy the BESTCOMS file from the sister rig. Voltage settles within 0.3 % on the first crank.

Hospital tri-gen plants parallel three 1 MW cats in PF mode. The Basler DECS-100’s cross-current loop shares reactive load to 2 %, eliminating circulating currents that used to trip breakers every shift change.

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