Marathon Electric DVR 2000E+ - Page 47

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auxiliary input, droop, step change and/or
the CAN bus are derived from this set point.
If there are no PT’s and the DVR
®
sensing
leads are connected line-to-line, the desired
generator output voltage is identical to the
Regulator Voltage Set Point. If the DVR
®
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 PT’s in the sensing circuit, the
desired generator output voltage is deter-
mined by the multiplication of the PT ratio
and the Regulator Voltage Set Point.
• Maximum External Contact Adjust is the
maximumadjustment percentage of the UP
and DOWN contact inputs.In FCR Mode,
field current is adjusted from a fixed mini-
mum of -3.000 Adc to a fixed maximum of
+3.000 Adc using the UP and DOWN con-
tacts.
• Field Current Set Point is editable in FCR
Regulation Mode. This value represents the
desired field current of the DVR
®
.
• Under Frequency Knee is the value of fre-
quency below which the regulator operates
in a Volts-per-Hertz mode. Refer to Section
4 – 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V/Hzmode.RefertoSection
4 – 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.
Refer to Section 4 – Features and Protection
for a detailed description of Load Sharing.
• PT Ratio is the value of the potential trans-
former 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
multiplied by this value.
Example: A PT with a 13,200 Volt primary
rating and a 240 Volt secondary rating would
have a PT Ratio of 55.
• CT Ratio is the value of the current trans-
former 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
multiplied by this value.
Example: A CT with an 800 A primary rating
and a 5 A secondary rating would have a CT
ratio of 160.
Auxiliary Input Configuration (4c)
This panel contains controls for modifying the func-
tionality of the auxiliary input.
• Auxiliary Input Type configures the auxiliary
input as a set point modifier, a meter input or
disabled. Refer to Section 4 – Features and
Protection for a detailed description of the
Auxiliary Input function.
• Aux. Meter Scale Factor is used only when
the auxiliary input type is configured as
“AuxiliaryMeter.”Thisvaluescalestheaux-
iliary input. Refer to Section 4 – Features and
Protection for a detailed description of the
Auxiliary Input function.
• Aux. Control Scale Factor is used when the
auxiliaryinputportisconfiguredas“Auxiliary
Control1” or “Auxiliary Control2” This value
scales the auxiliary input. Refer to Section
4 – Features and Protection for a detailed
description of the Auxiliary Input function
DVRPortal
™
Graphical User Interface (GUI)
GPN046 04-13.indd 45 4/5/13 10:24 AM