Basler Electric DGC-2020HD - Manual (Page 244)

234 9469300990 Rev B
Name Description Symbol
User
Programmable
Alarm x When the Trigger input is true, the label of a user alarm is
displayed on the Alarms screen on the front-panel display and in
sequence of events report after the activation delay expires.
Voltage Trim
Inhibit When true, this element inhibits operation of the DGC-2020HD
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-
2020HD 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-
2020HD units 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-2020HD in service.
Sending a Logic Scheme to the DGC-2020HD
To send settings to the DGC-2020HD, it must be connected to a computer through a communications
port. Once the necessary connections are made, settings can be uploaded to the DGC-2020HD by
selecting Upload Settings and Logic to Device or Upload Logic to Device on the Communication pull-
down menu.
Caution
Always remove the DGC-2020HD from service prior to changing or
modifying the active logic scheme. Attempting to modify a logic
scheme while the DGC-2020HD is in service could generate
unexpected or unwanted outputs.
Modifying a logic scheme in BESTCOMSPlus does not automatically
make that scheme active in the DGC-2020HD. The modified scheme
must be uploaded into the DGC-2020HD.
Operational settings are not included in the default logic scheme. Each
element, function, alarm, etc. will have to be enabled and programmed
separately using the Settings Explorer in BESTCOMSPlus.
BESTlogic
™Plus
DGC-2020HD