Basler Electric DECS-100-B11 Digital Excitation Controller Rev. AD

Basler Electric DECS-100-B11 Digital Excitation Controller (Rev. AD)

The Basler Electric DECS-100-B11 (Revision AD) is a digital excitation control system built for brushless, rotary-excited synchronous generators up to 5 MW. Designed for harsh marine engine rooms and industrial power plants, the fully potted enclosure resists moisture, salt fog, and mechanical vibration. It delivers precise voltage regulation, reactive power (var) and power factor (PF) control, and integrated generator protection in one compact panel-mount module.

Model Details:

• Brand: Basler Electric
• Model / Style Number: DECS-100-B11
• Hardware Revision: Rev. AD
• Manufacturer Part Number (MPN): 9287500128 (Style B11, 7 Adc continuous output)
• Style Configuration Breakdown (B11):
  • B: Includes Var/Power Factor (PF) regulation and Voltage Matching.
  • 1: Configured for 1 Aac nominal CT current sensing input.
  • 1: Standard 7 Adc continuous PWM field output stage.

Features

1. High-Precision PWM Power Stage: Delivers 63 Vdc at 7 Adc continuous and forces up to 135 Vdc at 15 Adc for 10 seconds (at 200 Vac input) to recover terminal voltage quickly during heavy motor starts.
2. Multi-Mode Digital Control: Operates in four distinct modes—Automatic Voltage Regulation (AVR), Field Current Regulation (FCR/Manual), Power Factor (PF), and Reactive Power (var)—to support both islanded marine buses and utility parallel tie-ins.
3. Nonlinear Load Immunity: Maintains ±0.25% voltage regulation accuracy across linear loads and ±0.5% accuracy under severe waveform distortion up to 40% Total Harmonic Distortion (THD) caused by 6-pulse SCR drives and bow thrusters.
4. Built-In Generator & Exciter Protection: Monitors and protects against generator overvoltage, field overvoltage, field overcurrent, and loss of voltage sensing (with automatic bumpless transfer to manual FCR mode).
5. PC Commissioning & Diagnostics: Connects via a rear 9-pin DB-9 RS-232 port to Basler BESTCOMS™ software for custom stability tuning, soft-start ramp programming (1 to 7,200 seconds), and real-time metering.

Compatibility

• Compatible Synchronous Alternators: Direct drop-in excitation controller for brushless AC generators up to 5 MW, including Stamford / Newage (HC4, HC5, HC6, HC7, P7, P80), Leroy-Somer (LSA 46.2, LSA 47.2, LSA 49.1, LSA 50.2), Caterpillar (SR4, SR4B, SR4HV), Marathon Electric (MagnaMAX), Kato Engineering, and AvK marine/industrial alternators.
• Compatible Basler Accessories & Relays:
  • Basler MVC104 / MVC108 / MVC300: Manual Voltage Controllers for redundant emergency excitation.
  • Basler ICRM-7: Inrush Current Reduction Module for shunt-excited startup surges.
  • Basler EDM200: Exciter Diode Monitor for rotating rectifier fault detection.
  • Basler DGC-2020 / DGC-2020HD & BE1-11g: Digital Genset Controllers and Generator Protection Systems.

Part Number Cross-References:

• Basler Base Style: DECS-100-B11 / DECS100-B11
• Basler Assembly MPN: 9287500128
• Basler Instruction Manual P/N: 9287500991
• Extended 10A Variant (Reference Only): 9287500147 (10 Adc output, non-marine rated)

Frequently Asked Questions

What is the difference between the Basler DECS-100-B11 and the DECS-100-B15?

The only hardware difference is the current transformer (CT) input rating. The DECS-100-B11 is built for 1 Aac CT secondaries (common in European and marine switchboards), whereas the DECS-100-B15 is built for 5 Aac CT secondaries (standard in North American installations). Both share the exact same 63 Vdc / 7 Adc PWM output, VAR/PF control, and voltage-matching functions.

Is the Basler Electric DECS-100-B11 approved for marine classification societies?

Yes. The standard 7 Adc DECS-100-B11 carries marine type approvals from Bureau Veritas (BV), Det Norske Veritas / Germanischer Lloyd (DNV·GL), and the Russian Maritime Register of Shipping (RMRS), and passes MIL-STD-810E salt-fog testing. (Note: The special-order 10 Adc extended-output variant does not hold these marine class approvals.)

Can the DECS-100-B11 operate on a Permanent Magnet Generator (PMG) supply?

Yes. Its operating power input (terminals 3, 4, and 5) accepts single-phase or three-phase power across a wide 50 Hz to 400 Hz frequency range at 88 to 250 Vac, making it fully compatible with both high-frequency PMG exciters and standard 50/60 Hz shunt-powered auxiliary windings.

What happens if the DECS-100-B11 loses generator voltage sensing while running?

The controller features an integrated Loss of Sensing protection algorithm. If sensing voltage drops out on terminals E1–E3 while field current is active, the DECS-100-B11 can be programmed via BESTCOMS™ to automatically execute a bumpless transfer into Manual Mode (Field Current Regulation) so the generator remains online without a blackout.

What is the minimum exciter field resistance allowed on the DECS-100-B11?

The exciter field winding connected across terminals F+ and F– must have a minimum DC resistance of 9.0 Ohms for standard continuous and 10-second forcing operation. Operating into a field resistance below 9 Ohms risks exceeding the 7 Adc continuous thermal limit of the internal PWM output stage.