Marathon Electric DVR 2000E+ - Section 3: Features and Protection

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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
SECTION 3 – FEATURES AND PROTECTION
INTRODUCTION
This section describes how the DVR
®
2000E+ functions and explains its operating features. DVR
®
2000E+
functions are illustrated in the block diagram of Figure 3-1.
DVR
®
2000E+ FUNCTION BLOCKS
The following paragraphs describe each of the function blocks, inputs and outputs illustrated in Figure 3-1.
Generator Voltage
Generator voltage is measured at terminals E1 (A-phase), E2 (B-phase), and E3 (C-phase). Nominal voltages of up
to 600Vac may be sensed at these terminals. Voltage applied to these inputs is scaled, conditioned and applied
to the controller.
Line Currents
Generatorlinecurrents(IA,IB,IC)aremeasuredviacurrenttransformers(CTs)atconnectorJ2orterminalsCT1
and CT2. Current up to 5 Arms may be monitored at these terminals. These currents are scaled, conditioned and
applied to the controller. Refer to Specifications in Section 1 for connector pin assignments.
Field Voltage
Voltage across the regulator field is monitored at terminals, F+ and F-.
Field Current
Current through the exciter field winding is measured at terminal F+. Field current is scaled, conditioned and
applied to the input of the controller.
Contact Input Circuits
Four contact input circuits powered from an internal 3.3 Vdc supply provide input control from user-supplied
contacts (UP, DOWN, DROOP_OFF, EXCITATION_OFF).
UP
ClosingtheUPcontactacrossterminalsJ1-2andJ1-4causestheactiveoperatingsetpointtoincrease.Keeping
the contact closed will continue to increase the operating set point until the limit is reached. The limit is determined
bythevalueenteredintheMaximumVoltageAdjusteldoftheWindows®software.Thiseldisadjustablein
0.1% increments and allows an input range of 0.0% to 15.0%. The effect the UP and DOWN contacts are having
on the set point is displayed in the Windows
®
software.