9440300990 23-1
DECS-250 Configuration
23 • Configuration
Before the DECS-250 is placed in service, it must be configured for the controlled equipment and
application.
Generator, Field, and Bus Ratings
BESTCOMSPlus Navigation Path: Settings Explorer, System Parameters, Rated Data
HMI Navigation Path: Settings, System Parameters, Rated Data
Generator, field, and bus rating settings are illustrated in Figure 23-1.
For proper excitation control and protection, the DECS-250 must be configured with the ratings of the
controlled generator and field. These ratings are typically shown on the generator nameplate or can be
obtained from the generator manufacturer. Required generator ratings include the voltage, frequency,
power factor, and apparent power (kVA). Generator current, real power (kW), and reactive power (kvar)
are listed with the other generator ratings as read-only settings. These values are automatically
calculated from the other generator ratings entered by the user. Required field ratings include the no load
dc voltage and current and full load voltage and current.
The ratio of exciter poles to generator poles is used by the exciter diode monitor (EDM) function to detect
open and shorted exciter diodes. The calculated value can be entered directly or calculated using the
pole calculator. A minimum ratio of 1.5 is recommended to ensure consistent EDM operation.
In applications where the generator will be synchronized/paralleled with a bus, the DECS-250 must be
configured with the rated bus voltage.
The nominal operating power input voltage is used to calculate the recommended Ka (Loop Gain) value.
This value is also used in metering calculations.
When using the DECS-250 with an exciter requiring an inverted output, check this box to enable the
inverting of the DECS-250 control output.
• Enabling inverted bridge output with an exciter which does not require inverted
bridge output will result in equipment damage.
• For optimal 40Q (loss of excitation) operation, set the rated PF to a value less than
1.0 on the BESTCOMSPlus Rated Data screen. When the rated PF value is
changed, the rated kW is automatically recalculated and the 40Q and 32 (reverse
power) element settings must be adjusted appropriately.
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