S
ection
3
• Overexcitation shutdown
• Generator overvoltage shutdown
• DVR overtemperature shutdown
• Loss of generator sensing shutdown
• Overexcitation limiting
• Crowbar shutdown
Each function, except Crowbar Shutdown, has a corresponding front panel indicator that lights when the function
is active. An active function (except Crowbar Shutdown) is also annunciated through the Windows® or Palm OS®
communication software.
Overexcitation Shutdown (Field Voltage)
This function is enabled or disabled through MARATHON-DVR2000E-32 software. When enabled, if eld voltage
exceeds the setpoint (80 Vdc default), the Overexcitation Shutdown indicator ashes on the front panel and in the
Windows® or Palm OS® communication software, the relay output closes after 15 seconds and the DVR2000E
shuts down. When the DVR2000E is powered up following an over-excitation shutdown, the Overexcitation
Shutdown indicator will ash for 5 seconds.
Generator Overvoltage Shutdown
The DVR2000E monitors the sensed generator output voltage. If it exceeds the overvoltage setpoint (a percent
of nominal) for 0.75 seconds, the Generator Overvoltage indicator ashes on the front panel LED and in the
Windows® and Palm OS® communication software, the relay output closes and the DVR2000E shuts down.
When the DVR2000E is powered up following a generator overvoltage shutdown, the Generator Overvoltage
indicator will ash for 5 seconds. The default setpoint is 120 percent of nominal.
DVR Overtemperature Shutdown
A temperature sensor within the DVR2000E continually monitors the temperature of the device. If the temperature
exceeds 70°C (158°F), the DVR Overtemperature indicator ashes on the front panel and in the Windows® and
Palm OS® communication software, the relay output closes and the DVR2000E shuts down.
Loss of Generator Sensing Shutdown
The DVR2000E monitors the sensed generator output voltage and takes protective action if a loss of sensing
voltage is detected. For single-phase sensing, a sensed voltage of less than 50 percent of nominal is interpreted
as a loss of sensing. For three-phase sensing, the total loss of a sensed phase or an imbalance between phases
of more than 20 percent nominal is interpreted as a loss of sensing. When sensing input continuity is not lost, an
adjustable time delay of 0 to 25 seconds is present when a loss of sensing condition is detected. If sensing input
continuity is lost, the time delay is disabled.
If a loss of sensing occurs, the Loss of Generator Sensing indicator ashes on the front panel and in the Windows®
and Palm OS® communication software, the relay output closes, and the DVR2000E shuts down. When the
DVR2000E is powered up following a loss of generator sensing shutdown, the Loss of Sensing indication will
ash for 5 seconds.
This function is disabled when a generator short circuit condition is detected or when sensed frequency drops
below 12Hz. A generator short-circuit is determined when the phase B CT current exceeds 3PU (>15 Aac sensing
current). Loss of sensing is not active during soft start time.
Overexcitation Limiting (Field Current)
The DVR2000E has a eld current limit that is factory preset at 6.5 amperes. The limit is adjustable from 0 to 7.5
amperes with an adjustable time delay that has a range of 0 to 10 seconds. Both settings are made through the
Windows® and Palm OS® communication software. When the overexcitation limit is exceeded, the Overexcitation
Limiting indicator ashes on the front panel and in the Windows® and Palm OS® communication software. When
the adjustable time delay expires, the relay output closes and the DVR2000E shuts down. When the DVR2000E is
powered up following overexcitation limiting, the Overexcitation Limiting indicator will ash for 5 seconds.
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