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Regulation DECS-250
The range of adjustment is defined by Minimum and Maximum settings that are expressed as a
percentage of the rated field current. The length of time required to adjust the FCR setpoint from one limit
to the other is controlled by a Traverse Rate setting.
Settings that are related to machine ratings can be set either in actual units or in per unit values. When a
native unit is edited, BESTCOMSPlus automatically recalculates the per unit value based on the native
unit setting and the rated data parameter (on the System Parameters, Rated Data screen) associated
with it. When a per unit value is edited, BESTCOMSPlus automatically recalculates the native value
based on the per unit setting and the rated data parameter associated with it.
Once all per unit values are assigned, if the rated data parameters are changed, BESTCOMSPlus
automatically recalculates all native unit settings based on the modified rated data parameters.
The FCR setpoint has a native unit of Primary Amps and the rated data associated with it is Field Rated
Data, Current – Full Load (on the System Parameters, Rated Data screen).
These settings are illustrated in Figure 7-1.
FVR
FVR (Field Voltage Regulation) mode enables generator modeling and validation testing in accordance
with WECC testing requirements. FVR mode can also be used to smooth the transfer from the active
DECS-250 to a secondary DECS.
When operating in FVR mode, the DECS-250 regulates the level of field voltage it supplies to the field
based on the FVR setpoint. The setting range of the FVR setpoint depends on the field rated data and
other associated settings. FVR setpoint adjustment is made through:
• Application of contacts at DECS-250 contact inputs configured for raising and lowering the active
setpoint
• Application of an analog control signal at the DECS-250 auxiliary Control input
• The BESTCOMSPlus Control Panel screen (available in the BESTCOMSPlus Metering Explorer)
• A raise or lower command transmitted through the DECS-250 Modbus port
The range of adjustment is defined by Minimum and Maximum settings that are expressed as a
percentage of the rated field voltage. The length of time required to adjust the FVR setpoint from one limit
to the other is controlled by a Traverse Rate setting.
Settings that are related to machine ratings can be set either in actual units or in per unit values. When a
native unit is edited, BESTCOMSPlus automatically recalculates the per unit value based on the native
unit setting and the rated data parameter (on the System Parameters, Rated Data screen) associated
with it. When a per unit value is edited, BESTCOMSPlus automatically recalculates the native value
based on the per unit setting and the rated data parameter associated with it.
Once all per unit values are assigned, if the rated data parameters are changed, BESTCOMSPlus
automatically recalculates all native unit settings based on the modified rated data parameters.
The FVR setpoint has a native unit of Primary Volts and the rated data associated with it is Field Rated
Data, Voltage – Full Load (on the System Parameters, Rated Data screen).
These settings are illustrated in Figure 7-1.
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