Winco DGC-500 - Manual (Page 30)

DGC-500 Functional Description 3-10
Weak Battery Voltage
A weak battery voltage pre-alarm occurs when the battery voltage decreases below the weak battery voltage
setpoint for the duration of the weak battery voltage time delay setting. Both settings are made in 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 an 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.