P44x/EN IT/E33 Introduction
Page 14/24
MiCOM P441/P442 & P444
3.6.1 Default display and menu time-out
The front panel menu has a selectable default display. The relay will time-out and return to
the default display and turn the LCD backlight off after 15 minutes of keypad inactivity. If this
happens any setting changes which have not been confirmed will be lost and the original
setting values maintained.
The contents of the default display can be selected from the following options: 3-phase and
neutral current, 3-phase voltage, power, system frequency, date and time, relay description,
or a user-defined plant reference*. The default display is selected with the ‘Default display’
cell of the ‘Measure’t setup’ column. Also, from the default display the different default
display options can be scrolled through using the ! and " keys. However the menu selected
default display will be restored following the menu time-out elapsing. Whenever there is an
uncleared alarm present in the relay (e.g. fault record, protection alarm, control alarm etc.)
the default display will be replaced by:
Alarms/Faults
Present
Entry to the menu structure of the relay is made from the default display and is not affected if
the display is showing the ‘Alarms/Faults present’ message.
3.6.2 Menu navigation and setting browsing
The menu can be browsed using the four arrow keys, following the structure shown in figure
4. Thus, starting at the default display the # key will display the first column heading. To
select the required column heading use the ( and " keys. The setting data contained in the
column can then be viewed by using the $ and # keys. It is possible to return to the column
header either by holding the [up arrow symbol] key down or by a single press of the clear key
!. It is only possible to move across columns at the column heading level. To return to the
default display press the # key or the clear key ! from any of the column headings. It is not
possible to go straight to the default display from within one of the column cells using the
auto-repeat facility of the # key, as the auto-repeat will stop at the column heading. To
move to the default display, the # key must be released and pressed again.
3.6.3 Password entry
When entry of a password is required the following prompt will appear:
Enter password
**** Level 1
NOTE: The password required to edit the setting is the prompt as shown
above
A flashing cursor will indicate which character field of the password may be changed. Press
the # and $ keys to vary each character between A and Z. To move between the
character fields of the password, use the ( and " keys. The password is confirmed by
pressing the enter key %. The display will revert to ‘Enter Password’ if an incorrect password
is entered. At this point a message will be displayed indicating whether a correct password
has been entered and if so what level of access has been unlocked. If this level is sufficient
to edit the selected setting then the display will return to the setting page to allow the edit to
continue. If the correct level of password has not been entered then the password prompt
page will be returned to. To escape from this prompt press the clear key !. Alternatively, the
password can be entered using the ‘Password’ cell of the ‘System data’ column.
For the front panel user interface the password protected access will revert to the default
access level after a keypad inactivity time-out of 15 minutes. It is possible to manually reset
the password protection to the default level by moving to the ‘Password’ menu cell in the
‘System data’ column and pressing the clear key ! instead of entering a password.
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