GE Power Management
LPS-D Line Protection System
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8 LOCAL USER INTERFACE
8.1 INTRODUCTION
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8 LOCAL USER INTERFACE 8.1 INTRODUCTION
8.1.1 DESCRIPTION
The Local User Interface (LUI) for the LPS-D Line Protection System 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. If the user wishes to go back up through the different levels
they just went down, that command key is used. For example, in ACTIONS, the [ACT] key will go back up
through the levels needed to perform that action. The [SET] and [INF] keys work the same way.
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If you make a mistake when you are entering data, just press the [CLR] key once, verify what you just
typed is gone and start re-typing the data or answer.
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Messages will be displayed at times. There may have been a mistake made in entering data or the relay
may be simply 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 but
leave the user at the same level. Pressing the [ACT], [SET] or [INF] keys will let the user continue.
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If a message box or list of items is similar to one preceding it, the new one will not be shown.
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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.
8.1.2 DISPLAY AND KEYPAD
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).
Figure 8–1: LPS-D KEYPAD
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