Marathon Electric DVR 2000E+, User Manual

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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
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