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Configuration DECS-250
Startup Functions
BESTCOMSPlus Navigation Path: Settings Explorer, Operating Settings, Startup
HMI Navigation Path: Settings, Operating Settings, Startup
DECS-250 startup functions consist of soft start and field flashing. These settings are illustrated in Figure
23-4.
Soft Start
During startup, the soft start function prevents voltage overshoot by controlling the rate of generator
terminal voltage buildup (toward the setpoint). Soft start is active in AVR, FCR, and FVR regulation
modes. Soft start behavior is based on two parameters: level and time. The soft start level is expressed
as a percentage of the nominal generator terminal voltage and determines the starting point for generator
voltage buildup during startup. The soft start time defines the amount of time allowed for the buildup of
generator voltage during startup. Two groups of soft start settings (primary and secondary) provide for
independent startup behavior which is selectable through BESTlogic™Plus.
Field Flashing
To ensure generator voltage buildup, the field flashing function applies and removes flashing power from
an external field flashing source. Field flashing is active in AVR, FCR, and FVR control modes. During
system startup, the application of field flashing is based on two parameters: level and time.
The field flash dropout level determines the level of generator voltage where field flashing is withdrawn. In
AVR mode, the field flash dropout level is expressed as a percentage of the generator terminal voltage. In
FCR mode, the level is expressed as a percentage of the field current. And in FVR mode, the level is
expressed as a percentage of the field voltage.
The field flash time defines the maximum length of time that field flashing may be applied during startup.
To use the field flashing function, one of the DECS-250 programmable contact outputs must be
configured as a field flashing output.
Figure 23-4. Startup Function Settings
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