Micom P721, Техническое руководство

Страница: 49 / 334

User Guide P72x/EN FT/C21
MiCOM P721/P723 Page 9/38
1.2 Menu structure
The relay’s menu is arranged in a tabular structure. Each setting in the menu is referred to
as a cell, and each cell in the menu may be accessed by reference to a row and column
address. The settings are arranged so that each column contains related settings, for
example all of the disturbance recorder settings are contained within the same column. As
shown in the figure, the top row of each column contains the heading that describes the
settings contained within that column. Movement between the columns of the menu can only
be made at the column heading level. A complete list of all of the menu settings is given in
the Menu Content tables (P72x/EH HI section).
Column
P0106ENb
data
settings
Column header
OP
param
Config.
Measur.
Comm. Autom. Ctrl
Records
Protections
MENU STRUCTURE
1.3 Password
1.3.1 Password protection
A password is required for relay settings, especially when changing the various thresholds,
time delays, communication parameters, allocation of inputs and outputs relays.
The password consists of four capital characters. When leaving factory, the password is set
to
AAAA . The user can define his own combination of four characters.
Should the password be lost or forgotten, the modification of the stored parameters is
blocked. It is then necessary to contact the manufacturer or his representative and a stand-
by password specific to the relay may be obtained.
The programming mode is indicated with the letter "P" on the right hand side of the display
on each menu heading. The letter
"P" remains present as long as the password is active
( 5 minutes if there is no action on the keypad).
1.3.2 Password entry
The input of the password is requested as soon as a modification of a parameter is made for
any one of the six/eight menus and the submenus. The user enters each one of the 4
characters and then validates the entire password with
.
After 5 seconds, the display returns to the point of the preceding menu.
If no key is pressed inside of 5 minutes, the password is deactivated. A new password
request is associated with any subsequent parameter modification.