5-4 BESTCOMS Software DECS-200
SYSTEM SETTINGS
DECS-200 settings, metering values, and data records are arranged into seven groups within
BESTCOMS:
• System Configuration
• Setting Adjustments
• Control Gain
• Analysis
• Protection/Relay
• Data Log
• Metering/Operation
Each group is contained on a BESTCOMS screen. A screen’s settings and parameters are further
organized by labeled tabs within the screen. In the following paragraphs, settings, metering values, and
data records are arranged and defined according to the organization of the BESTCOMS screen and tabs.
System Configuration
The System Configuration screen consists of four tabs labeled System Options, System Data, Rated
Data, and Auxiliary Input. To view the System Configuration screen, click the Configure button on the
toolbar or click S
creens on the menu bar and click System Configuration.
System Options
System Options tab functions are shown in Figure 5-7 and described in the following paragraphs.
Figure 5-7. System Configuration Screen, System Options Tab
Limiter Mode.
This setting disables all limiters or enables the underexcitation limiter (UEL), overexcitation
limiter (OEL), or stator current limiter (SCL). Selection of the following limiter combinations is also
possible: OEL/UEL, SCL/UEL, SCL/OEL, and SCL/OEL/UEL.
Sensing Configuration.
Configures the generator sensing voltage as either single-phase or three-phase.
Underfrequency Mode.
Configures underfrequency limiting for V/Hz or underfrequency operation.
Generator Frequency.
Selects either 50 hertz or 60 hertz as the nominal system frequency.
Voltage Matching.
Enables or disables voltage matching. For voltage matching to be enabled, the DECS-
200 must be operating in AVR mode, var/power factor correction must be disabled, and the system must
be off line.
Version Numbers.
These two read-only fields display the version of BESTCOMS software and the
firmware version of the DECS-200 connected to the PC operating BESTCOMS. In order for the DECS-
200 firmware version to be displayed, communication must be established between BESTCOMS and the
DECS-200.
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