Logic Schemes; The Active Logic Scheme - Basler DGC-2020 Instruction Manual

Name
Used to control the mains breaker. Connect the inputs and outputs to
inputs and outputs of other logic blocks. (This item is only available
MAINSBRK
when the Mains Breaker Hardware in configured on the Breaker
Hardware screen via the Breaker Management tree branch.)
MODEM
Connect the input to the output of another logic block. When TRUE, the
Modem will dial out.
(Optional)
When this input is TRUE, the DGC-2020 will switch to OFF mode. This
OFFMODE is a pulsed input. It does not need to be held after the desired mode
switch has occurred.
When this input is TRUE and the generator is paralleled to the mains,
PARTOMAINS the generator will regulate at the Base Load Level (%) that is set on the
Governor Bias Control Settings screen.
When this input is TRUE, and the DGC-2020 is in OFF mode, the
RUNMODE DGC-2020 will switch to RUN mode. This is a pulsed input. It does not
need to be held after the desired mode switch has occurred.
The Start input starts the generator and closes the Gen breaker. The
RUNWLOAD
Stop input stops the generator and opens the Gen breaker.

LOGIC SCHEMES

A logic scheme is a group of logic variables written in equation form that defines the operation of a DGC-
2020 Digital Genset Controller. Each logic scheme is given a unique name. This gives you the ability to
select a specific scheme and be confident that the selected scheme is in operation. One logic scheme is
configured for typical control applications and is the default active logic scheme. Only one logic scheme
can be active at a given time. In most applications, preprogrammed logic schemes eliminate the need for
custom programming. Preprogrammed logic schemes may provide more inputs, outputs, or features than
are needed for a particular application. This is because a preprogrammed scheme is designed for a large
number of applications with no special programming required. Unneeded logic block outputs may be left
open to disable a function or a function block can be disabled through operating settings.
When a custom logic scheme is required, programming time is reduced by modifying the default logic
scheme.

The Active Logic Scheme

Digital Genset Controllers must have an active logic scheme in order to function. All Basler Electric DGC-
2020's are delivered with a default, active logic scheme pre-loaded in memory. If the function block
configuration and output logic of the default logic scheme meets the requirements of your application,
then only the operating settings (power system parameters and threshold settings) need to be adjusted
before placing the DGC-2020 in service.
9400200990 Rev I
Description
DGC-2020 BESTlogic+ Programmable Logic
Symbol
5-11