Basler DECS-250, Инструкция по эксплуатации

Страница: 153 / 352

9440300990 Rev J 137
DECS-250 BESTlogic™ Plus
BESTlogic™Plus
Introduction
BESTlogic™ Plus Programmable Logic is a programming method used for managing the input, output,
protection, control, monitoring, and reporting capabilities of Basler Electric's DECS-250 Digital Excitation
Control System. Each DECS-250 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 BESTlogic
Plus .
BESTlogic Plus equations entered and saved in the DECS-250 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-250 is called a logic scheme.
Two default active logic schemes are preloaded into the DECS-250. 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-200. BESTCOMS
Plus
®
can be used to open a logic scheme that was previously saved as
a file and upload it to the DECS-250. The default logic schemes can also be customized to suit your
application. Detailed information about logic schemes is provided later in this chapter.
BESTlogic Plus 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-250. Detailed information about operating settings is provided in other chapters of this
instruction manual.
Overview of BESTlogic™Plus
Use BESTCOMS Plus to make BESTlogic Plus settings. Use the Settings Explorer to open the
BESTlogicPlus Programmable Logic tree branch as shown in Figure 123.
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.