BESTCOMS. The weak battery voltage setpoint has a setting range of 8 to 16 Vdc for 24 Vdc systems
and 4 to 8 Vdc for 12 Vdc systems. The weak battery voltage time delay has a setting range of 1 to 10
seconds.
Maintenance Interval
A maintenance interval pre-alarm occurs when the DGC-500 maintenance timer counts down to zero from
the maintenance interval setting programmed in BESTCOMS. The maintenance interval duration has a
setting range of zero to 5,000 hours.
Battery Charger Failure
A battery charger failure pre-alarm occurs when one of the three DGC-500 programmable contact inputs
detects a contact closure due to a battery charger failure. In order for a battery charger failure pre-alarm
to occur, the battery charger failure pre-alarm function must be enabled in BESTCOMS and one of the
three programmable inputs must be programmed as a battery charger failure pre-alarm input. Refer to
Section 4, BESTCOMS Software for information about configuring the programmable contact inputs.
Fuel Level Sender Failure
A fuel level sender failure pre-alarm occurs when an open circuit or short circuit is detected across the
DGC-500 fuel level transducer terminals and a fuel level sender failure is programmed in BESTCOMS to
cause a pre-alarm.
MPU Failure
An MPU (magnetic pickup) failure pre-alarm occurs when MPU-GEN is selected as the generator speed
signal source, the MPU signal is lost, and the Global Sender Failure Alarm time delay expires.
Active DTC
When CAN and DTC support are both enabled, an “active DTC” pre-alarm may be enabled (through
BESTCOMS) to announce the presence of a condition that is causing a DTC to be sent from the ECU to
the DGC-500.
CAN Failure
A CAN failure annunciation may be enabled only when the CAN interface is enabled. The CAN interface
is enabled through BESTCOMS. When configured to alarm, annunciation occurs when CAN
communication stops due to a lost connection between the DGC-500 and ECU, or an ECU malfunction. If
CAN communication is lost and the annunciation is a pre-alarm, a screen stating the pre-alarm will appear
in the Alternate Display menu. This screen will be viewable only when the pre-alarm is active.
Audible Alarm
A pre-alarm is annunciated through the DGC-500 Horn output when the audible alarm feature is enabled
in BESTCOMS. When the audible alarm is enabled, a pre-alarm condition causes the horn output to
alternate between an energized and de-energized state.
Alarms
An alarm is annunciated when a condition programmed to trigger an alarm is detected. When an alarm
condition exists, the front panel Alarm indicator lights, the Horn output energizes, and the cause of the
alarm is displayed on the LCD.
An alarm condition stops the engine by opening the Fuel output contact.
Each DGC-500 alarm is described in the following paragraphs.
Low Oil Pressure
A low oil pressure alarm occurs when the engine oil pressure decreases below the low oil pressure alarm
setpoint for the duration of the low oil pressure time delay setting. Both settings are made in BESTCOMS.
When a low oil pressure alarm occurs, the LCD indicates LOW OIL PRESSURE and the current low oil
pressure alarm setting. A 10-second activation time delay prevents low oil pressure annunciation during
engine startup.
The low oil pressure setpoint has a setting range of 3 to 150 psi or 20 to 1,035 kPa and the low oil
pressure time delay has a setting range of 5 to 15 seconds.
3-10 DGC-500 Functional Description 9355400990 Rev H
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