Basler DECS-250, Instruction Manual

Page: 42 / 352

26 9440300990 Rev J
Regulation DECS-250
•
The BESTCOMS Plus Control Panel screen (available in the BESTCOMS Plus Metering Explorer)
•
A raise or lower command transmitted through the DECS-250 Modbus port
The range of adjustment is defined by Minimum
J
and Maximum
K
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
L
setting. These settings are illustrated in Figure 15.
Figure 15. AVR, FCR, and FVR Regulation Settings
A
AVR Setpoint : Range of adjustment is based on the rated generator voltage and limited by the AVR Min
(B) and Max (C) settings.
B
Min (% of rated) : Adjustable from 70 to 120% in 0.1% increments.
C
Max (% of rated) : Adjustable from 71 to 120% in 0.1% increments.
D
Traverse Rate (s) : Adjustable from 10 to 200 seconds in 1 second increments.
E
FCR Setpoint : Range of adjustment is based on the rated field current and limited by the FCR Min (F)
and Max (G) settings.
F
Min (% of rated) : Adjustable from 0 to 120% in 0.1% increments.
G
Max (% of rated) : Adjustable from 0 to 120% in 0.1% increments.
H
Traverse Rate (s) : Adjustable from 10 to 200 seconds in 1 second increments.
I
FVR Setpoint : Range of adjustment is based on the rated field voltage and limited by the FCR Min (J)
and Max (K) settings.
J
Min (% of rated) : Adjustable from 0 to 150% in 0.1% increments.
K
Max (% of rated) : Adjustable from 0 to 150% in 0.1% increments.
L
Traverse Rate: Adjustable from 10 to 200 seconds in 1 second increments.
Var
When operating in var mode, the DECS-250 regulates the reactive power (var) output of the generator
based on the var setpoint
A
. The setting range of the var setpoint depends on the generator ratings and
other associated settings. Var 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 BESTCOMS Plus Control Panel screen (available in the BESTCOMS Plus Metering Explorer)
•
A raise or lower command transmitted through the DECS-250 Modbus port
The range of adjustment is defined by Minimum
B
and Maximum
C
settings that are expressed as a
percentage of the generator 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
D
. A Fine Voltage Adjustment Band setting
E
defines the upper and lower boundaries of voltage correction when operating in var or power factor
regulation modes. Var mode settings are illustrated in Figure 16.
Power Factor
When operating in Power Factor (PF) mode, the DECS-250 controls the var output of the generator to
maintain the Power Factor setpoint
F
as the kW load on the generator varies. The setting range of the PF