Basler Electric DECS-250N - Manual (Page 190)

174 9440500990 Rev D
Configuration DECS-250N
Rated Frequency
A Rated Frequency D setting establishes the rated operating power frequency to be expected by the
DECS-250N.
Maximum Over-Speed
The Maximum Over-Speed E setting establishes the maximum frequency to be expected by the DECS-
250N during an over-speed condition.
Figure 151. Bridge Operating Power Configuration
A Voltage: Select 100-139 or 190-277.
B Firing Pulse Mode: Select Single Phase or Three Phase
C Single Phase Selection: Select A-B, B-C, or A-C.
D Rated Frequency: Adjustable from 20 to 60 Hz, or 61 to 420 Hz in 1 Hz increments depending on style.
E Maximum Over-Speed: Adjustable from 50 to 320% in 1% increments.
Startup Functions
BESTCOMSPlus Navigation Path: Settings Explorer, Operating Settings, Startup
HMI Navigation Path: Settings, Operating Settings, Startup
DECS-250N startup functions consist of soft start and field flashing. These settings are illustrated in
Figure 152.
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
A 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
B 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.