Basler Electric DECS-250N - Manual (Page 43)

9440500990 Rev D 27
DECS-250N Regulation
Power Factor
When operating in Power Factor (PF) mode, the DECS-250N 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
setpoint is determined by the PF – Leading G and PF – Lagging H settings. The length of time required to
adjust the PF setpoint from one limit to the other is controlled by a Traverse Rate setting I . A Fine Voltage
Adjustment Band setting E defines the upper and lower boundaries of voltage correction when the
DECS-250N is operating in Var or Power Factor regulation modes. PF Active Power Level J establishes
the level of generator output power (kW) where the DECS-250N switches to/from Droop
Compensation/Power Factor mode. If the level of power decreases below the setting, the DECS-250N
switches from Power Factor mode to Droop Compensation mode. Conversely, as the level of power
increases above the setting, the DECS-250N switches from Droop Compensation mode to Power Factor
mode. A setting of 0 to 30% may be entered in 0.1% increments.
Power Factor mode settings are illustrated in Figure 16.
Figure 16. Var and Power Factor Regulation Settings
A Setpoint: Range of adjustment is based on the generator ratings and limited by the Var Minimum (B) and
Var Maximum (C) settings.
B Min (% of rated): Adjustable from –100 to 100% in 0.1% increments.
C Max (% of rated): Adjustable from 0 to 100% in 0.1% increments.
D Traverse Rate (s): Adjustable from 10 to 200 seconds in 1 second increments.
E Fine Voltage Adjustment Band: Adjustable from 0 to 30% in 0.01% increments.
F PF Setpoint: Range of adjustment is determined by the PF Leading (G) and Lagging (H) settings.
G PF – Leading: Adjustable from –1 to –0.5 in 0.005 increments.
H PF – Lagging: Adjustable from 0.5 to 1 in 0.005 increments.
I Traverse Rate (s): Adjustable from 10 to 200 seconds in 1 second increments.
J PF Active Power Level: Adjustable from 0 to 30% in 0.1% increments.
Pre-Position Setpoints
Each regulation mode has three pre-position setpoints which allow the DECS-250N to be configured for
multiple system and application needs. Each pre-position setpoint can be assigned to a programmable
contact input. When the appropriate contact input is closed, the setpoint is driven to the corresponding
pre-position value. Each pre-position function has two settings: Setpoint and Mode. The setting range of
each pre-position setpoint
A is identical to that of the corresponding control mode setpoint. The Mode B
setting determines whether or not the DECS-250N will respond to further setpoint change commands
while the pre-position command is being asserted. If the pre-position mode is Release, setpoint change
commands are accepted to raise and lower the setpoint while the pre-position command is being
asserted. Additionally, if the inactive pre-position mode is Release and internal tracking is enabled, the
pre-position value will respond to the tracking function. If the pre-position mode is Maintain, further
setpoint change commands are ignored while the appropriate contact input is closed. Additionally, if the
inactive pre-position mode is Maintain and internal tracking is enabled, the inactive mode will maintain the