Marathon Electric DVR 2000E - Crowbar Shutdown; Generator Soft Start

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Crowbar Shutdown
The Crowbar Shutdown Circuit protects the generator rotor from overcurrent damage resulting from a shorted
DVR
®
2000E power switch. During operation, if the fi eld voltage exceeds the setpoint and the power stage receives
no gating pulses for 1.5 seconds, the Crowbar Circuit activates and places a short-circuit across the DVR
®
2000E
input power terminals. This protects the generator by blowing the input power fuse and removing operating power
from the device.
Generator Soft Start
The DVR
®
2000E incorporates an adjustable soft start feature that controls the time for generator voltage to ramp
to the regulation setpoint. The ramp rate is adjustable from 2 to 120 seconds in 1 second increments through the
Windows® and Palm OS® communication software. The underfrequency feature is also active during soft start
and takes priority in control of the generator voltage. The factory default setting is 3 seconds.