DECS-200 Digital Excitation Control System
9
The front panel HMI (Human Machine Interface) is composed
of several elements, including a backlit LCD screen, six (6)
pushbuttons and six (6) LEDs. The LCD is the primary interface
because it conveys the majority of the information between the
DECS-200 and the user/operator. Front panel pushbuttons
allow the user to view menu screens and modify the various
screen settings and operating conditions. The LEDs annunciate
their respective states.
A) 64x128 pixel graphic LCD with backlighting. Primary source
for receiving information from the DECS or when locally
programming settings. Displays operations, set points, loop
gains, metering, protection functions, system parameters
and general settings.
B) Pre-Position LED – Turns ON at the predefined setting
(within the limits of the setpoints) of the current mode.
C) Lower Limit LED – Turns ON at the minimum set point value
of the current (active) mode.
D) Upper Limit LED – Turns ON at the maximum set point value
of the current mode.
E) Scrolling Pushbuttons – Scrolls UP/DOWN/LEFT/RIGHT
through the menu tree or when in the EDIT mode, the
LEFT/RIGHT scrolling pushbuttons select the variable to
change and the UP/DOWN scrolling pushbuttons change
the variable.
F) Reset Pushbutton – Cancels editing sessions and can be
used as a quick-access to the metering screen.
G) Serial Port COM0 – D-type 9 pin connector. This port is
dedicated to RS-232 (ASCII commands) communication
with a computer terminal or PC running a terminal emulation
program such as BESTCOMS™.
H) Edit Pushbutton – Enables settings changes. When the EDIT
pushbutton is first pushed, an LED on the pushbutton turns
ON to indicate the edit mode is active. When changes are
complete (using the scrolling pushbuttons) and the EDIT
pushbutton is pushed again, the LED turns OFF, indicating the
changes are saved. If changes are not completed and saved
within five minutes, the edit mode is exited without saving
changes.
I) Null Balance LED – Turns ON when the inactive modes (AVR,
FCR, var, or PF) match the active mode.
J) Internal tracking LED – All inactive modes (AVR, FCR, var, or
PF) track the active mode to accomplish the bumpless
transfer when changing active modes.
FRONT and SIDE PANEL VIEWS
Figure 2 - Side Panel View
