Marathon Electric DVR 2000E+ - Load Sharing; Generator Soft Start

16
Marathon Electric (a division of RBC Manufacturing Corp.) reserves the right to change specications and this manual without notice.
Revised 06/2011
: If the DC voltage is removed from the Auxiliary Input, the operating set point will no longer
be modified and the regulator will regulate to the programmed regulation set point.
Auxiliary - Meter
Inthismodetheauxiliaryinputfunctionsasameterwithuser-denedscaling.Avoltageupto+/-5Vdcoracur-
rentof4to20mAmaybeappliedtoterminalsJ1-1(+)andJ1-12(-).Thecircuitimposesa2260-ohmburdenon
the DC source for voltage input. The circuit imposes a 250-ohm burden on the DC source for current input when
ajumperisappliedacrossterminalsJ1-5andJ1-8.Thedefaultscalingis5000countsfora+5Vdcvoltageinput
and 5000 counts for a 20 mA current input. The user provides further scaling through the Windows
®
communica-
tion software. For example, if the user provides a scale factor of 0.20 units, the metered value corresponding to a
+5 Vdc voltage input will be +100 units. The metered value corresponding to a 20 mA current input will be +100
units.
Load Sharing
The DVR
®
2000E+ provides a reactive droop compensation feature to assist in the sharing of reactive load during
parallel generator operation. When this feature is enabled, the DVR
®
2000E+ calculates the reactive portion of
the generator load using the sensed generator output voltage and current quantities and then modifies the volt-
age regulation set point accordingly. A unity power factor generator load results in almost no change in genera-
tor 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percentwithratedlinecurrentand0.8powerfactor.Theeffectofdroopontheset
point is displayed in the Windows
®
communication software. The droop feature is enabled and disabled through
theDROOP_OFFcontactinputcircuit(terminalsJ1-10andJ1-4).Whensingle-phasecurrentsensing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
®
2000E+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sec)inone-secondincrements.ThisadjustmentismadethroughtheWindows
®
communication software 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.