Basler-electric DECS-250N User Manual Page 155

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9440500990 Rev D 139
DECS-250N BESTlogicPlus
BESTlogicPlus
Introduction
BESTlogicPlus Programmable Logic is a programming method used for managing the input, output,
protection, control, monitoring, and reporting capabilities of Basler Electric's DECS-250N Digital Excitation
Control System. Each DECS-250N has multiple, self-contained logic blocks that have all of the inputs and
outputs of its discrete component counterpart. Each independent logic block interacts with control inputs
and hardware outputs based on logic variables defined in equation form with BESTlogicPlus.
BESTlogicPlus equations entered and saved in the DECS-250N system's nonvolatile memory integrate
(electronically wire) the selected or enabled protection and control blocks with control inputs and
hardware outputs. A group of logic equations defining the logic of the DECS-250N is called a logic
scheme.
Two default active logic schemes are preloaded into the DECS-250N. One default logic scheme is
tailored for a system with the PSS option disabled and the other is for a system with PSS enabled. The
proper default logic scheme is loaded depending on the PSS option selected in the system style number.
These schemes are configured for a typical protection and control application of a synchronous generator
and virtually eliminate the need for "start-from-scratch" programming. The default logic schemes are
similar to that of a DECS-200N. BESTCOMSPlus
®
can be used to open a logic scheme that was
previously saved as a file and upload it to the DECS-250N. The default logic schemes can also be
customized to suit your application. Detailed information about logic schemes is provided later in this
chapter.
BESTlogicPlus is not used to define the operating settings (modes, pickup thresholds, and time delays) of
the individual protection and control functions. Operating settings and logic settings are interdependent
but separately programmed functions. Changing logic settings is similar to rewiring a panel and is
separate and distinct from making the operating settings that control the pickup thresholds and time
delays of a DECS-250N. Detailed information about operating settings is provided in other chapters of this
instruction manual.
Overview of BESTlogic™Plus
Use BESTCOMSPlus to make BESTlogicPlus settings. Use the Settings Explorer to open the
BESTlogicPlus Programmable Logic tree branch as shown in Figure 124.
The BESTlogicPlus Programmable Logic screen contains a logic library for opening and saving logic files,
tools for creating and editing logic documents, and protection settings.
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