Micom P721, Technical Manual

Page: 46 / 334

P72x/EN FT/C21 User Guide
Page 6/38 MiCOM P721/P723
1.1.3 LCD display and keypad description
The front panel components are shown below. The front panel functionality is identical for
the P721 and P723 relays.
1.1.3.1 LCD display
In the front panel, a liquid crystal display (LCD) displays settings, measured values and
alarms. Data is accessed through a menu structure.
The LCD has two lines, with sixteen characters each. A back-light is activated when a key is
pressed and will remain lit for five minutes after the last key press. This allows the user to be
able to read the display in most lighting conditions.
1.1.3.2
Keypad
The keypad has seven keys divided into two groups:
•
Two keys located just under the screen (keys and
c
).
Keys and
c
are used to read and acknowledge alarms. To display successive alarms,
press key
c
. Alarms are displayed in reverse order of their detection (the most recent alarm
first, the oldest alarm last). To acknowledge the alarms, the user can either acknowledge
each alarm using
or go to the end of the ALARM menu and acknowledge all the alarms
at the same time.
When navigating through submenus, key is also used to come back to the head line of
the corresponding menu.
NOTE: To acknowledge a relay latched refer to the corresponding submenu
section.
•
Four main keys , , , located in the middle of the front panel.
They are used to navigate through the different menus and submenus and to do the setting
of the relay.
The key is used to validate a choice or a value (modification of settings).
Read key
Arrow keys
Enter key
Arrow keys
Clear key
P3950ENc
Read key
Arrow keys
Enter key
Arrow keys
Clear key
P3950ENc