5-2 9492600990
Regulation DECS-150
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 (on the System Parameters, Rated Data screen).
The AVR/FCR Setpoints screen is illustrated in Figure 5-1.
Figure 5-1. AVR/FCR Setpoints Screen
Var
When operating in var mode, the DECS-150 regulates the reactive power (var) output of the machine
based on the var setpoint. The setting range of the var setpoint depends on the machine ratings and
other associated settings. Var setpoint adjustment is made through any one of the following methods:
• Application of contacts at DECS-150 contact inputs configured for raising and lowering the active
setpoint
• Application of an analog control signal at the DECS-150 Auxiliary Control input
• The BESTCOMSPlus Control Panel screen (available in the BESTCOMSPlus Metering Explorer)
• A raise or lower command transmitted through the DECS-150 Modbus port.
The range of adjustment is defined by Minimum and Maximum settings that are expressed as a
percentage of the machine rated kVA output. The length of time required to adjust the Var setpoint from
one limit to the other is controlled by a Traverse Rate setting. A Fine Voltage Adjustment Band setting
defines the upper and lower boundaries of voltage correction when operating in var or power factor
regulation modes.
Settings that are related to machine ratings can be set in either actual units of voltage 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 Reactive Power Control setpoint has a native unit of Primary kvar and the rated data associated with
it is Machine Rated Data, Rating (kVA) (on the System Parameters, Rated Data screen).
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