Basler Electric DECS-400 - Manual (Page 48)

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var setpoint from one limit to the other is controlled by the Var Traverse Rate setting. The Var Traverse
Rate is adjustable from 10 to 200 seconds.
PF
Power Factor mode is selected through BESTCOMS and enabled by a contact closure received at one of
the programmable contact inputs configured to enable Var/PF mode. When operating in PF mode, the
DECS-400 controls the var output of the generator to maintain a specific power factor as the kW load
varies on the generator. The desired power factor is entered through BESTCOMS or the front panel HMI
as the PF Setpoint setting. The setting range of the PF Setpoint is determined by the PF (Leading) and
PF (Lagging) settings. Once the PF setpoint is established, it can be fine tuned by applying a contact
input to terminals B7 and B8 (raise) or B8 and B9 (lower). Raise and lower inputs may also be applied
through BESTCOMS or Modbus. The PF (Leading) and PF (Lagging) settings control the range of
adjustment for the power factor setpoint. The PF (Leading) setting has a setting range of
–0.500 to –1.000
and the PF (Lagging) setting has a setting range of 1.000 to 0.500. The length of time required to adjust
the PF setpoint from one limit to the other is controlled by the PF Traverse Rate setting. The PF Traverse
Rate is adjustable from 10 to 200 seconds.
Control Mode Pre-Position Setpoints
Each control mode has two pre-position setpoints which enable configuration of the DECS-400 for
multiple system and application needs. Each pre-position setpoint can be assigned to a programmable
contact input. When that contact input is closed, the setpoint is driven to the corresponding pre-position
value. The Pre-Position 1 and Pre-Position 2 functions of each control mode have three settings:
Setpoint, Mode, and Traverse Rate.
The Setpoint range of each pre-position setpoint is identical to that of the corresponding control mode
setpoint.
The Mode setting determines whether or not the DECS-400 will respond to further setpoint change
commands once the operating setpoint is driven to the corresponding pre-position value. If the pre-
position mode is Release, subsequent inputs from the Raise or Lower controls are applied immediately.
Additionally, if the non-active 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 non-active
pre-position mode is Maintain and internal tracking is enabled, the non-active mode will maintain the non-
active setpoint at the pre-position value and override the tracking function.
When a setpoint is traveling toward a pre-position setting, the rules for Release and Maintain modes still
apply. In Release mode or Maintain mode with the pre-position contact open, a Raise or Lower input will
stop setpoint travel and the setpoint can be controlled normally. In Maintain mode, with the pre-position
contact held closed, Raise and Lower inputs are ignored and travel to the pre-position setpoint is
unhindered.
Note
In any pre-position mode, setpoint changes initiated through the HMI
or BESTCOMS will always apply. The pre-position modes affect
setpoint changes initiated only through the Raise and Lower inputs.
A Traverse Rate setting can be enabled to control the rate at which the control mode setpoint is driven
toward the selected pre-position level. This setting is expressed in seconds and controls the length of time
required for the setpoint to traverse the full setpoint range. Application of a pre-position input will typically
result in a traverse time that is a fraction of the traverse rate setting. A Traverse Rate delay of 1 to 720
seconds is possible. When disabled, there is no intentional traverse delay.
Functional Description DECS-400