9400200990 Rev I DGC-2020 BESTCOMSPlus Software 4-27
ALARM CONFIGURATION
DGC-2020 alarms and pre-alarms can be used to annunciate system, genset, and engine sender
conditions. The description of the alarm configuration settings is organized as follows:
• Pre-Alarms
• Alarms
• Sender Failure
Pre-Alarms
A pre-alarm is annunciated when a condition programmed to trigger a pre-alarm is met. When a pre-alarm
condition exists, it is annunciated (flashed) on the LCD, the front panel Alarm indicator flashes on and off
and the Horn output (if programmed and enabled) alternates between an energized and de-energized
state. The audible alarm is reset by pressing the front panel Alarm Silence pushbutton. When a pre-alarm
condition ceases to exist for pre-alarms other than weak battery, all displayed annunciations are reset
automatically. A weak battery pre-alarm condition is reset through the front panel by navigating to the
Alarms-Status, Pre-Alarms screen, scrolling through the list of pre-alarms until “Weak Battery” is
displayed, and pressing the Reset key.
Active pre-alarms are displayed on the main display of the LCD. The LCD annunciates an active pre-
alarm by alternating the pre-alarm message with the normally displayed data. All pre-alarms are
individually displayed, in sequence, by scrolling through the LCD pre-alarms list.
Each DGC-2020 pre-alarm is described in the following paragraphs. Pre-alarms may be enabled and
adjusted in BESTCOMSPlus or through the front panel HMI.
BESTCOMSPlus pre-alarm settings (DGC-2020, Alarm Configuration, Pre-Alarms) are illustrated in
Figure 4-27.
High Fu
el Level
High fuel level pre-alarm settings
A
consist of an enable/disable setting, a threshold setting, and an
activation delay. If enabled, a high fuel level pre-alarm occurs when the metered fuel level increases
above the threshold setting.
Low Battery Voltage
Low battery voltage pre-alarm settings
B
consist of an enable/disable setting, a threshold setting, and an
activation delay. If enabled, a low battery voltage pre-alarm occurs when the battery voltage decreases
below the threshold setting for the duration of the activation time delay. The threshold setting range is
based on the nominal battery voltage setting on the BESTCOMSPlus System Settings tab (DGC-2020,
System Parameters, System Settings).
Weak Battery Voltage
Weak battery voltage pre-alarm settings
C
consist of an enable/disable setting, a threshold setting, and an
activation time delay. If enabled, a weak battery voltage pre-alarm latches during engine cranking when
the battery voltage decreases below the threshold setting for the duration of the activation delay. The
threshold setting range is based on the nominal battery voltage setting on the BESTCOMSPlus System
Settings tab (DGC-2020, System Parameters, System Settings).
A weak battery pre-alarm condition is reset through the front panel by navigating to the Alarms-Status,
Pre-Alarms screen, scrolling through the list of pre-alarms until “Weak Battery” is displayed, and pressing
the Reset key.
Battery Overvoltage
Battery overvoltage pre-alarm settings
D
consist of an enable/disable setting and a fixed threshold setting.
If enabled, a battery overvoltage pre-alarm occurs when the battery voltage increases above the
threshold setting.
Maintenance Interval
Maintenance interval pre-alarm settings
E
consist of an enable/disable setting and a threshold setting. If
enabled, a maintenance interval pre-alarm is annunciated when the DGC-2020 maintenance timer counts
down to zero from the threshold time setting.
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