GE LPS-O Instruction Manual page 171

8 LOCAL USER INTERFACE
b) ARROW KEYS
The arrow keys are used to scroll through the lists of commands and categories and adjust the contrast of the
LCD display. By pressing the ↑ and ↓ keys, the user can select any item in the menu displayed. The LCD
scrolls upward or downward when there are more items than can be displayed on four lines.
When the user reaches the desired category, pressing the [ENT] key will produce the name of the category on
the top line and the first three items in that category on the following three lines. The user can use ↑ or ↓ keys
to scroll through the items.
The ↑ key scrolls in a backward direction through a list of categories or items while the ↓ key scrolls forward
through a list. The ↑ will select the item before it in a list (for example, from item 5 to item 4). The ↓ will select
the item after it in a list (for example, from item 5 to item 6).
Both the ↑ and ↓ keys wrap. Wrapping happens when the top or bottom of a list is reached. The last item
becomes the first and the first item becomes the last.
c) ENTER KEY [ENT]
The [ENT] key is used to enter data or make a selection. When a category name or command is selected on
the display and the [ENT] key is pressed, the user is choosing to scroll through that category. After an item is
selected to be edited using the [ENT] key, the numeric keys and decimal point are used to enter the value.
When the correct value has been entered, the [ENT] key is used to accept the new value for the selected item.
d) DATA ENTRY KEYS
The numeric keys [1/Y] and [3/N] have two meanings, depending on the context. If the user is entering numeric
values, the [1/Y] and [3/N] keys are used as the numbers 1 and 3. If the user is responding to a YES/NO
prompt, the [1/Y] key is used and displayed as YES and the [3/N] key is used and displayed as NO.
The [INV] key is used to invert the values of logic signals used with the programmable outputs. For example, if
the user needs to invert the value of the ZONE 1 AB logic signal (Index number 65) for input into programma-
ble output A1, the key sequence [INV] followed by [6] then [5] is entered. The display will indicate: !85.
All messages on the display are the result of some keypad action, with four exceptions: the Trip message when
the relay has caused a protective trip; the Fail message when the relay has discovered a critical self-test fail-
ure; the Warning message when the relay has discovered a non-critical self-test failure; and the Initialization
messages when the relay is initializing during a power-up.
If a protective trip occurs when there is no self-test message (Self-test Failure or Warning) on the display, the
TRIP message will be displayed on four lines of the display. An example is shown below:
The TRIP message will be displayed with the background flashing to indicate that the relay has caused a pro-
tective trip. The red TRIP LED will also be flashing to indicate the trip, and that the trip has not been acknowl-
edged. Three fields of information form the TRIP message on display. They are: a two or three character fault
type (e.g. AB), a two or three character trip type (see Section 8.2.3: REQUEST FAULT INFORMATION on
page 8–19 for a list of the trip types), and distance to the fault (in user-specified units). The message will
remain on the display until removed by a keypad operation or by the remote communications Target Reset
command. If the relay restarts or is powered down and up, the trip indicator will be remembered and redis-
GE Power Management
TRIP
AB
Z1
50.5 MI
LPS-O Line Protection System
8.1 INTRODUCTION
8.1.4 MESSAGES
8-
3
8