Description
Core Product Summary
The Basler DECS-200-2L is a microprocessor-based digital excitation control system designed to regulate terminal voltage, reactive power, and power factor for synchronous generators. It integrates closed-loop voltage regulation, system protection, and monitoring functions into a single hardware platform. The unit controls generator output by modulating the DC excitation current applied to the exciter field winding.
Equipped with True RMS single-phase or three-phase voltage sensing, the DECS-200-2L delivers a voltage regulation accuracy of ±0.25% from no load to full load. It features a pulse-width modulated (PWM) power stage and supports field output voltage selections of 32 VDC, 63 VDC, or 125 VDC at up to 15 ADC continuous current. Configuration and real-time monitoring are handled via an integrated front-panel LCD interface or through PC setup software using onboard serial communication ports.
Key Technical Specifications
| Parameter | Specification |
| Product Type | Digital Excitation Control System / Automatic Voltage Regulator (AVR) |
| Manufacturer | Basler Electric |
| Voltage Regulation Accuracy | ±0.25% (steady state stability ±0.1%) |
| Excitation Output Voltage Options | 32 VDC, 63 VDC, or 125 VDC |
| Continuous Output Current | Up to 15 ADC |
| Forced Excitation Current | 30 ADC for up to 10 seconds |
| Voltage Sensing | True RMS, single-phase or three-phase |
| Control Modes | Automatic Voltage Regulation (AVR), Field Current Regulation (FCR / Manual), Var / Power Factor Control |
| Communication Interfaces | Front-panel RS-232, side-panel RS-485 (Modbus protocol support) |
| Configuration Software | BESTCOMS / Windows-based setup software |
| Operating Ambient Temperature | -40 °C to +60 °C (-40 °F to +140 °F) |
| Dimensions (W × D × H) | 205 mm × 171 mm × 304 mm (8.08 in × 6.76 in × 12.0 in) |
| Net Weight | ~6.35 kg (14 lbs) |
| Approvals & Certifications | UL recognized, CSA certified, CE compliant, DNV certified, GOST-R certified |
Detailed Product Overview
The Basler DECS-200-2L provides precise excitation control for synchronous generators used in industrial, commercial, and marine power generation applications. By utilizing a microprocessor architecture combined with a pulse-width modulated power stage, the unit maintains stable voltage profiles even when feeding non-linear loads.
The controller includes multiple pre-programmed PID stability configurations and user-customizable loop tuning parameters to match diverse prime mover and generator dynamics. Operational security is supported by integrated protective limiters—including minimum and maximum excitation limiters (both on-line and off-line) and a stator current limiter—designed to prevent generator operation outside safe thermal and electrical limits.
Diagnostic tools include sequence-of-events recording and waveform capture (oscillography) to assist engineers during fault analysis. The unit’s auto-tracking function enables bumpless transfer between automatic voltage regulation and manual field current regulation modes, as well as between redundant controller configurations.
DECS-200-2L
DECS-200-2L
System Compatibility & Integration Requirements
| Item / Dependency | Verified Compatibility or Requirement | Practical Note |
| Control Object | Synchronous generator exciter field windings (32V, 63V, or 125V systems up to 15A) | Field parameters must match the selectable output ranges of the controller. |
| Current Transformers (CT) | 1 A or 5 A secondary CT inputs for metering, control, and cross-current compensation | External CT wiring required for Var/PF control and paralleling compensation. |
| Power Supply Input | Control power options include DC or AC configurations (e.g., 16–60 VDC, 90–150 VDC, or 85–132 VAC) | Requires a dedicated control power source independent of main sensing inputs. |
| Remote Setpoint / Interface | ±10 VDC, 4–20 mA analog inputs, and 24 VDC dry contact switching inputs | Accommodates external control signals and power system stabilizers (PSS). |
| Engineering Setup | PC running Windows-based configuration software via RS-232/RS-485 | Serial communication cable required for PC-based parameter loading and diagnostics. |
Dimensions, Mounting & Connection Notes
- Physical Dimensions: 205 mm wide × 171 mm deep × 120 mm high (8.08 in × 6.76 in × 12.0 in).
- Weight: Approximately 6.35 kg (14 lbs).
- Mounting Configuration: Designed for cabinet or cubicle panel assembly within electrical control enclosures.
- Environmental Tolerances: Tested for high shock and vibration resistance per industrial standards; includes salt fog protection compliance (MIL-STD-810E, Method 509.3).
- Surge Protection: Meets IEEE C37.90.1-1989 standards for surge withstand capability and fast transients.
FAQ
What is the primary function of the Basler DECS-200-2L?
The Basler DECS-200-2L is a digital excitation control system and automatic voltage regulator (AVR) that regulates the output voltage, reactive power, and power factor of a synchronous generator by controlling its field excitation current.
What output ratings does the DECS-200-2L support?
The unit accommodates field excitation applications requiring 32 VDC, 63 VDC, or 125 VDC at continuous output currents up to 15 ADC, with a forced excitation capacity of 30 ADC for up to 10 seconds.
What control modes are available on the unit?
It supports Automatic Voltage Regulation (AVR), Manual Field Current Regulation (FCR), and Var / Power Factor control modes, allowing bumpless transfers between modes.
How is the DECS-200-2L configured and monitored?
Configuration, parameter adjustments, and real-time metering can be performed locally using the front-panel backlit LCD screen and HMI pushbuttons, or remotely via a PC running Windows-based setup software connected through the RS-232 or RS-485 ports.
Does the controller support network communications?
Yes, the side-mounted RS-485 port supports the Modbus protocol, enabling communication and data polling over distances up to 4,000 feet.
What operating temperature limits apply to this model?
The unit is rated for an ambient operating temperature range of -40 °C to +60 °C (-40 °F to +140 °F).
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