Basler Electric DGC-2020 - Manual (Page 258)

Name Description Symbol
STOPKVARRAMP The Stop kvar Ramp logic element, when true, causes the
generator to freeze the ramping of kvar and maintain a
constant output.
STOPKWRAMP The Stop kW Ramp logic element, when true, causes the
generator to freeze the ramping of kW and maintain a
constant output.
TESTINHIBIT When this logic element is true, the generator exercise
timer cannot start the generator. If the TESTINHIBIT logic
function is false during an exercise period, or transitions
from true to false at any time during an exercise period,
the DGC-2020 will start and run the generator for the
duration of the exercise period.
VOLTAGETRIM
INHIBIT When true, this element inhibits operation of the
DGC-2020 voltage trim PID controller. For example,
voltage trim is not desired in multiple generator systems
during start up synchronization until the generators are
stable.
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.
Copying and Renaming Preprogrammed Logic Schemes
Copying a saved logic scheme to the active logic (Logic Name) and assigning a unique name is
accomplished by loading the saved logic scheme into BESTCOMSPlus and then typing over the logic
scheme's name. Changes are not activated until the new settings have been saved and uploaded to the
device.
Sending and Retrieving Logic Schemes
Retrieving a Logic Scheme from the DGC-2020
To retrieve settings from the DGC-2020, the DGC-2020 must be connected to a computer through a
communications port. Once the necessary connections are made, settings can be downloaded from the
DGC-2020 by selecting Download Settings and Logic on the Communication pull-down menu.
Sending a Logic Scheme to the DGC-2020
To send settings to the DGC-2020, the DGC-2020 must be connected to a computer through a
communications port. Once the necessary connections are made, settings can be uploaded to the DGC-
2020 by selecting Upload Settings and Logic on the Communication pull-down menu.
5-30 DGC-2020 BESTlogic ™ Plus Programmable Logic 9400200990 Rev X