Low Fuel Level
A low fuel level alarm occurs when the fuel level decreases below the setpoint programmed in
BESTCOMS. When a low fuel level alarm occurs, the LCD indicates LOW FUEL LEVEL and the current
low fuel level alarm setting.
The low fuel level setpoint has a setting range of zero to 100 percent.
High Coolant Temperature
A high coolant temperature alarm occurs when the coolant temperature exceeds the setpoint
programmed in BESTCOMS. When a high coolant temperature alarm occurs, the LCD indicates HIGH
COOLANT TEMP and the current high coolant temperature setting. A 60-second activation time delay
prevents high coolant temperature annunciation during system startup.
The high coolant temperature setpoint has a setting range of 100 to 280°F or 38 to 138°C.
Overspeed
An overspeed alarm occurs when the engine speed exceeds the overspeed setpoint for the duration of
the overspeed time delay. Both settings are made in BESTCOMS. When an overspeed alarm occurs, the
LCD indicates OVERSPEED and the current overspeed setting.
The overspeed setpoint has a setting range of 105 to 140 percent and the overspeed time delay has a
setting range of zero to 500 milliseconds.
Loss of Generator Voltage
A loss of generator voltage alarm can occur only when the loss of generator voltage alarm is enabled in
BESTCOMS. When the sensed generator voltage decreases below 1.5 Vac for the duration of the global
sender failure alarm time delay, a loss of generator voltage alarm occurs. The global sender failure alarm
time delay is adjustable from 1 to 10 seconds.
Oil Pressure Sender Failure
An oil pressure sender failure alarm occurs when the DGC-500 oil pressure transducer input senses a
sender failure for the duration of the global sender failure alarm time delay. The oil pressure sender failure
alarm is enabled and the global sender failure alarm time delay is set in BESTCOMS.
Coolant Temperature Sender Failure
A coolant temperature sender failure alarm occurs when the DGC-500 coolant temperature transducer
input senses a sender failure for the duration of the coolant temperature alarm delay time. The coolant
temperature sender failure alarm is enabled and the coolant temperature alarm delay is set in
BESTCOMS. The coolant temperature alarm delay is adjustable from 5 to 30 minutes in 5 minute
increments.
Speed Source Failure
A speed source failure can occur for either of two conditions. If MPU (magnetic pickup) is selected as the
generator speed signal source and the MPU signal is lost, a speed source failure alarm will occur. If GEN
FREQ (generator frequency) is selected as the generator speed signal source and a loss of generator
frequency is detected, a speed source failure alarm will occur.
CAN Failure (If Equipped)
A CAN failure annunciation may be enabled only when the CAN interface is enabled. The CAN interface
is enabled through BESTCOMS. When configured to pre-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 configured as an alarm, then a normal alarm
sequence will occur, including a CANBUS FAILURE message that appears on the HMI display.
Real-Time Clock
The real-time clock supplies time and date information to the event log for the time stamping of events.
Clock data is held in volatile memory; clock settings are lost when DGC-500 operating power is removed.
When DGC-500 operating power is restored, the DGC-500 prompts the user to set the real-time clock.
The DGC-500 keeps time in 24-hour mode and uses the HH:MM:SS format. The date format is
MM/DD/YYYY. Adjustment for daylight saving time can be enabled or disabled. Clock settings may be
viewed and entered in BESTCOMS or at the front panel HMI.
9355400990 Rev H DGC-500 Functional Description 3-11
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