Specifications

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ection

Protection

The DVR

2000E has the six protective functions listed below:

•

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-DVR

2000E-COMS software. When enabled, if ﬁ eld

voltage exceeds the setpoint (80 Vdc default), the Overexcitation Shutdown indicator ﬂ ashes on the front panel

and in the Windows® or Palm OS® communication software, the relay output closes after 15 seconds and

the DVR

2000E shuts down. When the DVR

2000E is powered up following an over-excitation shutdown, the

Overexcitation Shutdown indicator will ﬂ ash for 5 seconds.

Generator Overvoltage Shutdown

The DVR

2000E monitors the sensed generator output voltage. If it exceeds the overvoltage setpoint (a percent

of nominal) for 0.75 seconds, the Generator Overvoltage indicator ﬂ ashes on the front panel LED and in the

Windows® and Palm OS® communication software, the relay output closes and the DVR

2000E shuts down.

When the DVR

2000E is powered up following a generator overvoltage shutdown, the Generator Overvoltage

indicator will ﬂ ash for 5 seconds. The factory default setpoint is 120 percent of nominal.

DVR

Overtemperature Shutdown

A temperature sensor within the DVR

2000E continually monitors the temperature of the device. If the temperature

exceeds 70°C (158°F), the DVR

2000E Overtemperature indicator ﬂ ashes on the front panel and in the Windows®

and Palm OS® communication software, the relay output closes and the DVR

2000E shuts down.

Loss of Generator Sensing Shutdown

The DVR

2000E 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 ﬂ ashes on the front panel and in the Windows®

and Palm OS® communication software, the relay output closes, and the DVR

2000E shuts down. When the

DVR

2000E is powered up following a loss of generator sensing shutdown, the Loss of Sensing indication will

ﬂ 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 DVR

2000E has a ﬁ eld current limit that is factory preset at 6.15 amperes. The limit is adjustable from 0 to 6.5

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 ﬂ 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 DVR

2000E shuts down. When the DVR

2000E

is powered up following overexcitation limiting, the Overexcitation Limiting indicator will ﬂ ash for 5 seconds.