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8.1 INTRODUCTION
up, the trip indicator will be remembered and redisplayed. In either case, as soon as any key on the keypad is
pressed or remote communications resets the target, the LED indicating protective tripping by the relay will
stop flashing and the trip message will be removed from display. The trip information is stored for later use.
When a system failure occurs, the fail message is always shown on the bottom two lines of the display and has
the following format:
BBB FAIL–XXXXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXXXX
where BBB stands for the sub-system name issuing the message, and XXX...XXX is the text which describes
the critical self-test failure. The fail message remains on the display until a key is pressed or until the relay
restarts successfully (with no self-test failures).
If a trip message is already on display when a failure occurs, it is displayed on the top line instead of all four
lines. The fail message is still shown on the bottom two lines of the display, as shown below:
Since a trip has occurred, the LCD background for all four lines will be flashing.
Warning messages are always displayed on the bottom two lines using the same format as failure messages.
The warning message remains on the display until a key is pressed or the relay restarts successfully (with no
self-test warnings). If a trip message is already displayed when a warning occurs, the display format will be the
same as the fail message. Since a trip has occurred the LCD background will be flashing.
The Initialization messages are displayed while the relay is initializing itself during a power up (and not during a
warm restart).
All other messages are the result of keypad operations and remain on the display until another key is pressed,
or until no keys have been pressed for 15 minutes. At the end of this time-out interval, the display is blanked.
Though there are some exceptions (e.g. the display of present values and events), the following apply for any
user-initiated interaction:
•
The top line of the display shows the current category. For example, if the user is editing a setting item, the
top line shows the name of the current category, the setting group number and the setting item number. If
the user is viewing the status of the contact converters, the top line shows CC STATUS.
•
The fourth line usually displays the response to the actions initiated by the user. The response will be
either a success or error message.
8
When the user ends a session by pressing the [END] [ENT] sequence of keys, the display is cleared after 10
seconds. The KEYPAD/DISPLAY INTERFACE access privilege is then set to View Level.
The [SET] command allows the user to edit Protection and General Settings, change the active settings group,
and modify the date and time.
Pressing the [SET] key prompts the user for the Settings level password. If the password is not valid, PASS-
WORD INVALID is displayed on the bottom line of the display. The [CLR] key deletes this error message and
prompts again for the password. If the password is valid, the user's privilege level is set to the one associated
with the entered password.
8-
4
TRIP AG Z1 50.5MI
BBB FAIL-XXXXXXXXXXX
XXXXXXXXXXXXXXXXXXXX
LPS-D Line Protection System
8 LOCAL USER INTERFACE
8.1.5 SETTINGS
GE Power Management
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