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Display; Keypad; Breaker Control - GE L90 Instruction Manual

Line differential relay ur series.
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4.2 FACEPLATE INTERFACE
4 HUMAN INTERFACES

4.2.3 DISPLAY

All messages are displayed on a 2 × 20 character vacuum fluorescent display to make them visible under poor lighting con-
ditions. An optional liquid crystal display (LCD) is also available. Messages are displayed in English and do not require the
aid of an instruction manual for deciphering. While the keypad and display are not actively being used, the display will
default to defined messages. Any high priority event driven message will automatically override the default message and
appear on the display.

4.2.4 KEYPAD

Display messages are organized into 'pages' under the following headings: Actual Values, Settings, Commands, and Tar-
gets. The
key navigates through these pages. Each heading page is broken down further into logical subgroups.
The
MESSAGE
keys navigate through the subgroups. The
VALUE
keys scroll increment or decrement
numerical setting values when in programming mode. These keys also scroll through alphanumeric values in the text edit
mode. Alternatively, values may also be entered with the numeric keypad.
The
key initiates and advance to the next character in text edit mode or enters a decimal point. The
key may be
pressed at any time for context sensitive help messages. The
key stores altered setting values.
4

4.2.5 BREAKER CONTROL

a) DESCRIPTION
The L90 can interface with associated circuit breakers. In many cases the application monitors the state of the breaker,
which can be presented on faceplate LEDs, along with a breaker trouble indication. Breaker operations can be manually
initiated from faceplate keypad or automatically initiated from a FlexLogic™ operand. A setting is provided to assign names
to each breaker; this user-assigned name is used for the display of related flash messages. These features are provided for
two breakers; the user may use only those portions of the design relevant to a single breaker, which must be breaker No. 1.
For the following discussion it is assumed the
!"
!"
!
!
SETTINGS
SYSTEM SETUP
BREAKERS
BREAKER n
BREAKER FUNC-
setting is "Enabled" for each breaker.
TION
b) CONTROL MODE SELECTION AND MONITORING
Installations may require that a breaker is operated in the three-pole only mode (3-Pole), or in the one and three-pole (1-
Pole) mode, selected by setting. If the mode is selected as 3-pole, a single input tracks the breaker open or closed position.
If the mode is selected as 1-Pole, all three breaker pole states must be input to the relay. These inputs must be in agree-
ment to indicate the position of the breaker.
For the following discussion it is assumed the
!"
!"
!
!"
SETTINGS
SYSTEM SETUP
BREAKERS
BREAKER n
BREAKER
setting is "Enabled" for each breaker..
PUSH BUTTON CONTROL
c) USER KEY CONTROL
After the 30 minute interval during which command functions are permitted after a correct command password, the user
cannot open or close a breaker via the keypad. The following discussions begin from the not-permitted state.
d) CONTROL OF TWO BREAKERS
For the following example setup, the symbol (Name) represents the user-programmed variable name.
For this application (setup shown below), the relay is connected and programmed for both breaker No. 1 and breaker No. 2.
The USER 1 key performs the selection of which breaker is to be operated by the USER 2 and USER 3 keys. The USER 2
key is used to manually close the breaker and the USER 3 key is used to manually open the breaker.
4-8
L90 Line Differential Relay
GE Multilin

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