8.20
SEL-751 Relay Instruction Manual Date Code 20170927
Front-Panel Operations
Touchscreen Display Front Panel
Front-Panel Automatic Messages
The relay displays automatic messages that override the present display under
the conditions described in Table 8.6. Relay failure messages have the highest
priority, followed by trip and alarm. When the relay has a trip or alarm
condition, the trip and diagnostic messages screen will appear on the display.
These messages can also be accessed by tapping the Trip & Diag. Messages
application in the Device Info folder.
Front-Panel Security
Use the Access Level folder on the Home screen for login/logout operations.
The SEL-751 front panel typically operates at Access Level 1 and allows you
to view relay measurements and settings. Particular activities, such as editing
settings and controlling output contacts, are restricted to those operators who
know the Access Level 2 password.
When an activity requires Access Level 2, an authentication screen appears on
the display, which requires you to enter the 2AC password to proceed further.
After you have correctly entered the password, you can perform other
Access Level 2 operations without re-entering the password. You will have to
re-enter the password if the front-panel inactivity timer, FPTO, expires.
See PASSWORD Command (Change Passwords) on page 7.44 for the list of
default passwords and for more information on changing the passwords.
Front-Panel Timeout
To help prevent unauthorized access to password-protected functions, the
SEL-751 provides a front-panel timeout setting, FPTO, in the Touchscreen
application in the Settings folder. The timeout resets each time you press a
front-panel pushbutton or tap the display. Once the timeout expires, the access
level resets to the ACC access level. You can manually reset the access level
by tapping Logout in the Access Level folder. The backlight of the display
goes dark 60 minutes after the inactivity timer (1–30 min) expires.
Touchscreen
Navigating the Touchscreen Folders and Applications
Use the front-panel touchscreen and pushbuttons to access data measured and
stored by the relay and to perform relay operations. All relay information and
operations are available through the touchscreen via folders, applications, and
the buttons in the sidebar. Table 8.7 describes the functions of the sidebar
buttons.
Ta b l e 8 . 6 Fr o nt- Pa ne l Au to ma t i c M e ss a g es
Condition Front-Panel Message
Relay detects any failure Displays the latest failure type (refer to
Section 11: Testing and Troubleshooting).
Relay trip occurs Displays the type or cause of the trip (refer to
Table 10.1 for a list of trip display messages).
Relay alarm condition occurs Displays the type of alarm. The TRIP LED also
flashes during an alarm condition (refer to
Ta ble 8 .3 for a list of the warning conditions).
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