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8 LOCAL USER INTERFACE
8 LOCAL USER INTERFACE 8.1 INTRODUCTION
The Local User Interface (LUI) for the Line Protection System (LPS-O) consists of a 4-line liquid crystal display
(LCD), a keypad, and trip and status LEDs.
There a few conventions used with the keypad and display that will be mentioned periodically in this section.
However, to aid the user in using this section more effectively, they will be described briefly here.
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When a command key is pressed a menu will be displayed. There are several levels of choices and menus
which will be needed to perform a certain task. To scroll back up through the different levels previously
scrolled down, the same command key is used. For example, in the ACTIONS menu, the [ACT] key will go
back up through the levels needed to perform that action. The [SET] and [INF] keys work the same way.
•
If a mistake is made while entering data, press the [CLR] key once. Verify that the incorrect text has been
deleted re-type the data or answer.
•
Messages will be occasionally displayed. There may have been a mistake made in entering data or the
relay may be informing the user of a state they have just put the relay in. These messages must be cleared
before any other keypad input can be accepted. The [CLR] key will remove these messages and leave the
user at the same level. Pressing the [ACT], [SET] or [INF] keys will let the user continue.
•
If a message box or list of items is similar to one preceding it, the new one will not be shown.
•
There are lists of items that have numbers next to them that appear on the display. If the number of an item
is known the number can be pressed followed be the [ENT] key. This will position the cursor on the item.
The user must press the [ENT] key one more time to actually enter the item the cursor is on.
a) DISPLAY
The LCD display consists of four 20-character lines. The LCD character contrast can be adjusted through the
[ACT] key on the keypad. For more information see Section 8.1.11: ACTIONS on page 8–9.
b) KEYPAD
The keypad consists of twenty keys: 10 numeric keys, a decimal point, eight function keys and an [INV] key (as
shown below):
GE Power Management
Figure 8–1: LPS-O KEYPAD
LPS-O Line Protection System
8.1 INTRODUCTION
8.1.1 DESCRIPTION
8.1.2 DISPLAY & KEYPAD
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8
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