GE DGP Series Instruction Manual page 177

8 INTERFACE 8.3 KEYPAD
8.3 KEYPAD 8.3.1 DESCRIPTION
The MMI keypad is an interface method on the DGP system. The keypad is comprised of twenty keys. See the
figure below for details on keypad layout.
Figure 8–2: MMI KEYPAD
8.3.2 CLEAR KEY [CLR]
The [CLR] key is used to abort a keyboard sequence in progress (for example, when the user needs to correct
an error). When the [CLR] key is pressed, all or part of the display is blanked. If there is user-entered informa-
tion on the display, only that information will be blanked. For example, if the user is entering a Setting value
when the [CLR] key is pressed, only the user's input will be blanked; the name of the setting remains on the
display. As another example, if the user is responding to an Action prompt, only the user's input will be blanked;
the prompt question remains on the display. If there is no user-entered information on the display, the entire
display is blanked and the DGP expects a command key to be pressed.
If a Trip, Fail, or Warn message is being displayed, the user must press the [CLR] key to blank the error mes-
sage (all other keys will be ignored). When the error message is blanked, the last message will be displayed,
allowing the user to re-enter the correct response.
Fault data is displayed by pressing the [CLR] key while a TRIP message is displayed. Only target information
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(TRIP messages) and the time of the trips for the accumulated faults are displayed. Pressing [CLR] while the
current TRIP message is displayed shows its time of occurrence. Pressing [CLR] again shows the date. Press-
ing [CLR] one more time shows target information for the previous fault. This continues until all the accumu-
lated fault information is displayed. At this point the display becomes blank. TRIP messages for the recorded
faults are displayed in normal intensity and non-blinking; the latest TRIP message is displayed blinking with
high intensity. The target LEDs display the protection functions that operated for the current TRIP message.
Present values scrolling is activated by pressing the [CLR] key when the display is blank (items displayed are
described later under [INF] command key processing). Each item is displayed four seconds before proceeding
to the next item. After scrolling through all of the items, the display is blanked.
Both the fault data display and the present value display are stopped by a TRIP or a keypress.
GE Power Management DGP Digital Generator Protection System 8-
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