1. SGC-250 Synchronous Generator Controller

2. Introduction
Utilizes Basler’s newest Voltage Regulator, the DECS-250, and the optional Multifunctional Relay, the BE1-11g
Increased features and functionality placed onto the SGC-250
Pre-defined styles for quick and easy elections
Designed, built, and tested by one company for increased reliability

3. Brushless Synchronous Generator

4. One-Line Diagram

5. One-Line Diagram

6. Basler Solution for Excitation Control

7. Basler Solution for Excitation Control

8. Visual Comparison
DECS-200 Pan 1
SGC-250

9. Visual Comparison
DECS-200 Pan 3
SGC-250

10. SGC-250 with BE1-11g option Single Dual Single: 21.61” W x 45.74” H
Dual: 29.53” W x 54.14” H

11. Feature/Function/Benefit
Customer Connection
Terminals available for connection to the system
Allows for easy connect and disconnect to the SGC-250
All In One System
Every component required is laid out on the SGC-250
System in one package eliminates the need for additional required components
Designed, Built, and Tested by one company
Basler is only company to handle system from start to finish
Eliminates additional time and fees associated with joint company designs
Minimal Component Use
Only include the necessary components to allow the SGC-250 to run efficiently
Increases MTBF and reduces amount of maintenance required
Field Flashing
Provides supplementary excitation until generator terminal voltage reaches a certain level
Prevents Generator Terminal Voltage from dropping too low

12. Control Modes Automatic Voltage Regulation (AVR)
In AVR mode, the DECS-250 regulates the excitation level in order to maintain the generator terminal voltage setpoint
Field Current Regulation (FCR)
In FCR mode, the DECS-250 regulates the level of excitation current it supplies to the field
Power Factor
Regulates the machine to a specific power factor
Var
Regulates the reactive power of the machine

13. Communication Provisions
USB
Connects the DECS-250 with the PC operating software BESTCOMSPlus®
Ethernet-100 Base-T(Modbus™ TCP)
Allows for connection to a PC or BESTCOMSPlus
RS-485 with Modbus RTU
Used for communication with external accessories such as the AEM-2020 and CEM-2020
RS-232 for external tracking between dual DECS units (backwards compatible)

14. Monitoring Provisions
DECS-250
Real Time Monitoring
2 User-Selectable Plots
Oscillography
Up to 6 Oscillography records with up to 1200 data points recorded per parameter
Saved in Non-Volatile memory
Sequence of Events Recorder
1023 events stored per record scanned every four milliseconds.
The DECS-250 is usually set slower so as to capture the whole system response to stay in the correct control mode while the BE1-11m is set faster to capture every event that happens to alarm and/or trip when necessary.

15. Real Time Monitoring

16. BESTCOMSPlus® Configurable Logic

17. BESTCOMSPlus® Metering Screens

18. Mounting Options Pan Chassis Mounting Plate
Made using a rigid metal panel
Welded with structural supports for added strength
Mounting Plate
Made using a 1/16” thick sheet of galvanized steel
Ability to be hung in specific enclosures

19. Pan Chassis Mounting Plate
Mounting Options Cont.
Pan Chassis Mounting Plate

20. Accessories Analog Expansion Module (AEM-2020)
Provides 8 remote analog inputs, 8 RTD inputs, 2 thermocouple inputs and 4 analog outputs
Contact Expansion Module (CEM-2020)
Provides 10 more contact inputs and 18 or 24 more contact outputs for higher or lower currents
The CEM-2020 connects to the DECS-250 and comes in 2 different modules. The CEM-2020 or the CEM-2020H for higher current

21. Accessories cont, IDP-800 Interactive Display Panel
A 7.5” in diameter Human Machine Interface (HMI) capable of viewing generator parameters locally and remotely