7
F O R M
DVR
®
2400 and DVR
®
2500 Digital Voltage Regulator
Installation, Operation and Maintenance Manual
SB0056E
Revised
November 2018
Regal Beloit America, Inc.
100 East Randolph Street
Wausau, WI 54402-8003
www.regalbeloit.com/Brands/
Marathon-Generators
FEATURES AND PROTECTION
INTRODUCTION
This section describes how the regulator functions and explains its operating features. Regulator
functions are illustrated in the block diagram of Figure 4-1.
Before proceeding forward, carefully read and fully understand the warnings, cautions, & safety notice statements in this manual. Failure to do so could
cause severe injury, death, and/or equipment damage.
DVR® REGULATOR FUNCTION BLOCKS
The following paragraphs describe each of the function blocks, inputs and
outputs. Refer to Figure 4-1.
Generator Voltage
Generator voltage is measured at terminals E1 (A-phase), E2 (B-phase),
and E3 (C-phase), for ABC rotation, or E1 (C-phase), E2 (B-phase), and
E3 (A-phase) for CBA rotation. Nominal voltages of up to 600Vac may be
sensed at these terminals. Voltage applied to these inputs is scaled, condi-
tioned and applied to the controller.
Line Currents
Generator line currents (IA, IB, IC) are measured via CTs at connectors
P1 and P2. Current up to 5 Arms may be monitored at these terminals.
These currents are scaled, conditioned and applied to the controller. Refer
to
, for connector pin assignments.
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
Nine contact input circuits powered from an internal 3.3 Vdc supply pro-
vide input control from user-supplied contacts: UP, DOWN, DROOP_OFF,
EXCITATION_OFF, VAR/PF_OFF, *PS0, *PS1, *DVR_RESET and *VM
(*2500 only)
UP
Closing the UP contact across terminals P1-7 (UP) and P1-11 (DG) causes
the active operating set point to increase.
DOWN
Closing the DOWN contact across terminals P1-8 (DN) and P1-11 (DG)
causes the active operating set point to decrease.
Keeping either contact closed will continue to increase (UP) or decrease
(DOWN) the operating set point until a limit is reached. The limit is de-
termined by the Maximum External Contact Adjust field of DVRPortal™
software. The effect generated by the contacts is displayed in DVRPortal™
software on the Set Points Tab as the value “Contact Offset.”
Analog
Input
Power
Input
Stage
Power
Supply
Power
Amplifier
Stage
Contact
Inputs
Controller
Fault
Output
Contact
CAN
Port
USB 2.0
Port
HMI
Interface
RTD
Module
Exciter Field
Input
Power
Generator Sensing
Exciter Field Sensing
Auxiliary Input
Up
Down
Droop Off
ExcitaKon Off
VAR/PF Off
Reset
PS0
PS1
VM
BaOery
Power
Eight 3-wire
RTD’s
Shunt Module
Figure 4-1. Simplified Block Design
