Marathon Electric DVR 2000E+ - Generator Soft Start

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entered via the HMI) to calculate the proper rated
reactive power for the droop reference.
The DVR
®
provides a reactive droop compensa-
tion feature to enable reactive load sharing during
parallel generator operation.When this feature is
enabled, the DVR
®
calculates the reactive portion of
the generator load using the sensed generator out-
putvoltageandcurrentquantitiesandthenmodifies
the voltage regulation set point accordingly.
A unity power factor generator load results in almost
no change in generator output voltage. A lagging
power factor generator load (inductive) results in a
reduction of generator output voltage. A leading
power factor generator load (capacitive) results in an
increase of generator output voltage.
Droopisadjustableupto10.0%withratedreactive
power (VAR’s) and rated power factor. The effect of
droop on the set point is displayed in DVRPortal™.
The droop feature is enabled and disabled through
the DROOP_OFF contact input circuit (terminals
J1-10 and J1-4).When single-phase current sens-
ing is used, the droop function responds to phase B
current.Whenthree-phasecurrentsensingisused,
the droop function responds to the average phase
current.
Generator Soft Start
The DVR
®
 incorporates an adjustable soft start
feature that controls the time for generator voltage
to ramp to the regulation set point. This feature
is enabled in AVR3 and AVR1 regulation modes.
The ramp rate is adjustable from 2 to 120 seconds
(default of 3 seconds).This adjustment is made
through DVRPortal™ and cannot be made through
the HMI.The Generator Under Frequency feature
is also active during Generator Soft Start and takes
priority in control of the generator voltage.
Features and Protection
GPN046 04-13.indd 12 4/5/13 10:24 AM