Description
The Basler DECS-250N is a microprocessor-based digital excitation control system designed for brushless-excited AC synchronous generators and motors. It utilizes a 20-amp, six-thyristor negative forcing bridge output configuration to deliver rapid system transient response and high stability.
Technical Specifications
| Parameter | Value |
| Manufacturer | Basler Electric |
| Product Family | DECS-250N (Digital Excitation Control System with Negative Forcing) |
| Continuous Output Current | 20 Adc (up to 55°C) |
| Field Forcing Capacity | 40 Adc for 10 seconds; 30 Adc for 120 seconds |
| Control Power Options | Style-dependent: 16 to 60 Vdc or 90 to 150 Vdc / 82 to 132 Vac |
| Sensing Inputs | True RMS single-phase or three-phase voltage and current (1 Aac or 5 Aac nominal) |
| Regulation Modes | AVR, FCR, FVR, Power Factor, and Var modes |
| Communication Protocols | USB, Modbus RS-485 RTU, Modbus TCP (Ethernet 100Base-T), J1939 CANbus; optional Profibus or Ethernet 100Base-F |
| Operating Temperature | -40 to +60°C |
| Enclosure Protection | IP20 (with conformal coating applied to internal circuitry) |
| Dimensions (W x H x D) | 159.0 mm x 304.8 mm x 219.0 mm (6.26 in x 12.00 in x 8.62 in) |
| Weight | 6.62 kg (14.6 lbs) |
Supply Terms & Commercial Details
- Availability: Stock levels fluctuate; contact us to verify current inventory status for immediate dispatch or project staging.
- Lead Time: Dependent on factory production schedules and specific model code configurations.
- Warranty: 12-month standard vendor or supplier warranty covering operational defects.
- Condition: New Original Surplus or Factory Fresh (confirm exact status upon inquiry).
- Pricing Note: Listed price is indicative, not final. Price subject to market conditions; contact us for a firm quote.
Engineering & Integration Guidance
When deploying the DECS-250N in critical power generation schemes, utilize Basler’s BESTCOMSPlus software suite for configuration, real-time strip charting, and automated PID loop tuning.
- Firmware and Logic: Configure internal protection parameters (such as elements 25, 27/59, 32R, 40Q, 51F, and 81O/U) using BESTlogicPlus programmable logic blocks to match plant protection coordination studies.
- Field Resistance Verification: Ensure the connected exciter field resistance matches the nominal output range of the specific hardware configuration (e.g., minimum field resistance of 3.15 \Omega for 63 Vdc systems or 12.5 \Omega for 250 Vdc systems) to avoid thermal over-stress or current-limit trips.
- Verification: Always verify terminal wiring layouts and control power parameters against the official OEM instruction manual before energizing the excitation circuit.
Frequently Asked Questions
What is the primary difference between the standard DECS-250 and the DECS-250N?
The standard DECS-250 uses a 15-amp pulse-width-modulated (PWM) power stage, whereas the DECS-250N incorporates a 20-amp six-thyristor negative field-forcing output stage, optimized for rapid transient response and applications requiring an optional Power System Stabilizer (PSS).
Can I use external expansion modules with this controller?
Yes. The DECS-250N supports hardware expansion through compatible modules such as the AEM-2020 Analog Expansion Module and the CEM-2020 Contact Expansion Module.
How is offline logic testing performed without connection to the physical generator?
Engineers can utilize the Offline Simulator tool integrated within the BESTlogicPlus environment to validate protection schemes and control logic prior to physical commissioning.
