Marathon Electric DVR 2000E+ - Page 11

9
DOWN
Closing the DOWN contact across terminals J1-3
and J1-4 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 determined
by the Maximum External Contact Adjust field of
DVRPortal™. The effect generated by the contacts
is displayed in DVRPortal™ on the Set Points Tab as
thevalue“ContactOffset.”
Note: If power is removed from the DVR
®
, the settings
from the remote UP/DOWN contacts will be lost.
DROOP_OFF
This function enables reactive load sharing between
generators operating in parallel. Closing the DROOP_
OFF contact across terminals J1-10 and J1-4 dis-
ables voltage droop. Opening the contact enables
voltage droop.
EXCITATION_OFF
This contact input enables removal of excitation
without removing power to the regulator. Closing the
EXCITATION_OFF contact across terminals J1-11
andJ1-4disablesfieldexcitation.Openingthecon-
tact enables field excitation with a soft start and
clears any alarms or faults.
VAR/PF_OFF (EC+ only)
NOTE: Operation in VAR or PF modes should only
be enabled when generator is paralleled with utility
(infinite bus).
This function enables VAR or PF regulation when the
generator is paralleled to utility. Opening the VAR/
PF_OFF contact across terminals J1-9 and J1-4
enables VAR or PF control. Closing the contact
disables VAR or PF regulation and defaults to AVR3
regulation.
Communication Port (RS-232)
The communication port provides an isolated inter-
face for user programming of the DVR
®
through
DVRPortal™. The connection is made to the female
RS-232 (DB-9) connector with a user-supplied,
standard 9-pin cable. A null modem cable will not
function.
CAN Port
The CAN port provides an isolated interface for
communication with and control of the DVR
®
. This
permits the integration of the DVR
®
as a node on
a CAN network. The connection is made to the
J3 connector with a user-supplied Amp/Tyco Mini
Mate-N-Lok plug. The communication is powered
from a transformer-isolated supply. Refer to Section
3 – Specifications, for connector details.
Controller
The controller portion of the DVR
®
includes the
microprocessor and performs measurement, com-
putation, control and communication functions.
Power Input Stage
Input power is applied to terminals 3 and 4 from a
PMG. It is rectified and filtered before being applied
to the power amplifier and the power supply.
Power Supply
The internal switch-mode power supply is fed from
the power input stage and supplies power at the
requiredDCvoltagelevelstotheinternalcircuitryof
the DVR
®
.
Power Amplifier Stage
The power amplifier is fed from the power input
stage and supplies a controlled amount of power to
the exciter field via terminals F+ and F-.
HMI Display
A four-character light-emitting-diode (LED) display
indicates various operating modes, protective func-
tions,andadjustments.Section 6 – Human-Machine
Interface provides more information about the front
panel display.
HMI Buttons
Changes to settings can be made at the front panel
using the four buttons:
SELECT,UP,DOWNandENTER
Refer to Section 6 – Human-Machine Interface for
more information about the front panel switches.
4
Features and Protection
h
•
i
;
GPN046 04-13.indd 9 4/5/13 10:24 AM