Marathon Electric DVR 2000E+ - Set Points Sub Panel

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Marathon Electric (a division of RBC Manufacturing Corp.) reserves the right to change specications and this manual without notice.
Revised 06/2011
Set Points Sub Panel
Thispanelcontains editable eldsfor Regulator VoltageSet Point, MaximumVoltage Adjust, FieldCurrentSet
Point, Under Frequency Knee, Under Frequency Slope, Droop, Auxiliary Input Scale Factor, PT Ratio and CT Ratio
and a radio button for configuration of the auxiliary input port. Offsets to the regulator set point are also displayed
in this panel.
Regulator Voltage Set Point is editable in AVR1 or AVR3 Regulation Modes. This value represents the desired
voltage at the regulator voltage sensing terminals, regardless of potential transformers. Offsets from the UP and
DOWNcontacts,auxiliaryinputport,droopand/ortheCANbusarederivedfromthissetpoint.
If there are no PTs (potential transformers) in the system, and the regulator sensing leads are connected line-to-
line, the desired generator output voltage is the Regulator Voltage Set Point. If the regulator sensing leads are
connected midpoint-to-midpoint of a series wye configuration, the desired generator output voltage is twice the
Regulator Voltage Set Point.
If there are PTs in the sensing circuit, the desired generator output voltage is determined by the multiplication of
the PT ratio and the Regulator Voltage Set Point.
Maximum Voltage Adjust is the maximum adjustmentpercentage of the RegulatorVoltage Set Point allowed
through use of the UP and DOWN contact inputs.
Field Current Set Point is editable in FCR Regulation Mode. This value represents the desired field current of the
regulator. The regulator will maintain this fixed level of field current regardless of changes in load.
Under Frequency Knee is the value of frequency below which the regulator operates in a Volts-per-Hertz mode.
Refer to Section 3 – Features and Protection for a detailed description of Generator Under Frequency.
Slope Multiplier is the factor applied to the base slope for voltage roll-off with respect to frequency in a Volts-
per-Hertz mode. Refer to Section 3 – Features and Protection for a detailed description of Generator Under
Frequency.
DroopisthemaximumpercentageofRegulatorVoltageSetPointallowedforadjustmentofvoltageduringload
sharing with another generator. Refer to Section 3 – Features and Protection for a detailed description of Load
Sharing.
Auxiliary Input Scale Factorisusedwhentheauxiliaryinputportisconguredas“Auxiliary–Meter.”Thisvalue
scales the auxiliary input. Refer to Section 3 – Features and Protection for a detailed description of the Auxiliary
Input function.
PT Ratio is the value of the potential transformer ratio of the system. The generator output voltages displayed in
the Generator tab of the Metering panel are equivalent to the voltages displayed in the Regulator tab times this
value. Example: A PT with a 13,200 Volt primary rating and a 230 Volt secondary rating would have a PT ratio of
57.39.
CT Ratio is the value of the current transformer ratio of the system. The generator output currents displayed in the
Generator tab of the Metering panel are equivalent to the currents displayed in the Regulator tab times this value.
Example: A CT with an 800 A primary rating and a 5 A secondary rating would have a CT ratio of 160.