DECS-400 Digital Excitation Control System
SZF-5
9-10
• Microprocessor-based design
• Five Control Modes, with autotracking between modes
- Automatic Voltage Regulation (AVR)
- Power Factor (PF)
- Field Current Regulation (FCR)
- Field Voltage Regulation (FVR)
- Var Control
• 0.20% Voltage Regulation Accuracy
• Two pre-position set points for each mode
• Two Programmable Analog Outputs
• Setup from Front Panel HMI or by PC (local or remote)
• 40 Standard Stability Settings
• Time synchronization using IRIG or NTP (via Ethernet)
• Optional Integral Power System Stabilizer
- Dual input, integral of accelerating power (IEEE PSS2A/2B)
- Customer selectable speed-only sensing
- Two wattmeter power measurement
- Optional Frequency Based Operation
- Generator or Motor control modes
• Customizable Stability Setting with two PID setting groups
• Reactive Droop, Line Drop Compensation
• Generator Voltage Soft-Start during Buildup
• Real Time Metering for 19 Generator Parameters
• Voltage Matching
• Autotracking with Optional Backup DECS-400
• Flexible Remote Set point Control
- Contact inputs
- Proportional Analog input, ±10 Vdc or 4-20 mA
- Digital Communications
Local RS-232, ASCII, Modem Capabilities
RS-485, Modbus™, RJ-45 Ethernet
(continued on page 2)
The DECS-400 Digital Excitation Control System is a microprocessor-based controller that provides excitation
control, flexible logic control, and optional power system stabilization for synchronous machines in an
integrated package. The controller provides an analog output to control the DC output of an external rectifier
bridge and monitors machine parameters to control, limit, and protect the synchronous machine from
operating beyond its capability limitations.
The optional Power System Stabilizer is an IEEE-type PSS2A/2B, dual input, "integral of accelerating power"
stabilizer that provides supplementary damping for low-frequency local mode, inter area, and inter unit power
system oscillations.
Setup and initial operation are facilitated by Basler Electric's user-friendly BESTCOMS PC software that
incorporates real time monitoring test analysis, flexible oscillography, trending, and expanded testing
capabilities, including means for performing frequency response tests with a graphic display of results. This
replaces the need for an external Dynamic System Analyzer.
DECS-400
Digital Excitation
Control System
P. O. BOX 269 HIGHLAND, ILLINOIS, U.S.A. 62249 PHONE 618-654-2341 FAX 618-654-2351
DESCRIPTION and
SPECIFICATIONS
Pages 2 through 6
FEATURES and
FUNCTIONS
Pages 6 through 9
FRONT VIEW
and DIMENSIONS
Page 9
INTERCONNECT
DIAGRAM
Page 10
BESTCOMS SOFTWARE
Pages 10 and 11
CUTOUT and ORDERING
Page 12
FEATURES
ADDITIONAL INFORMATION
INSTRUCTION MANUAL
Request Publication 9369700990
WINDOWS
®
SOFTWARE
Interface for setting and communicating with Basler products
Request BESTCOMS-DECS400
