Sel 751A, Instruction Manual

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8.4
SEL-751A Relay Instruction Manual Date Code 20100129
Front-Panel Operations
Human-Machine Interface
Figure 8.3 Password Entry Screen
See PASSWORD Command (Change Passwords) on page 7.33 for the list of
default passwords and for more information on changing passwords.
Front-Panel Timeout
To help prevent unauthorized access to password-protected functions, the
SEL-751A provides a front-panel timeout, setting FP_TO. A timer is reset
every time a front-panel pushbutton is pressed. Once the timeout period has
expired, the access level is reset to Access Level 1. Manually reset the access
level by selecting
Quit
from the
MAIN
menu.
Front-Panel Menus
and Screens
Navigating the Menus
The SEL-751A front panel gives you access to most of the information that
the relay measures and stores. You can also use front-panel controls to view or
modify relay settings.
All of the front-panel functions are accessible through use of the six-button
keypad and LCD display. Use the keypad (shown in
Figure 8.4 ) to maneuver
within the front-panel menu structure, described in detail throughout the
remainder of this section.
Table 8.2 describes the function of each front-panel
pushbutton.
Figure 8.4 Front-Panel Pushbuttons
Password=
Del Clr Accept
A B C D E F G H
I J K L M N O P
Q R S T U V W X
Y Z . . . . . .
a b c d e f g h
i j k l m n o p
q r s t u v w x
y z . . . . . .
0 1 2 3 4 5 6 7
8 9 . . . . . .
! " # $ % & ' (
) * + , - . / :
; < = > ? @ [ \
] ^ _ ` { | } ~
ESC