Schweitzer Engineering Laboratories SEL-751 - Table 8.1 Front-Panel Automatic Messages (FP_AUTO:= OVERRIDE)

8.3
Date Code 20170927 Instruction Manual SEL-751 Relay
Front-Panel Operations
Two-Line Display Front Panel
You can use the following features of the versatile SEL-751 front-panel to
customize it to your needs:
➤ Rotating display on the HMI
➤ Programmable tricolor target LEDs
➤ Programmable tricolor pushbutton LEDs
➤ Slide-in configurable front-panel labels to change the
identification of target LEDs, pushbuttons, pushbutton LEDs
and their operation.
Two-Line Display
Human-Machine
Interface
Contrast
You can adjust the LCD screen contrast to suit your viewing angle and
lighting conditions. To change screen contrast, press and hold the ESC
pushbutton for two seconds. The SEL-751 displays a contrast adjustment box.
Pressing the Right Arrow pushbutton increases the contrast. Pressing the Left
Arrow pushbutton decreases the screen contrast. When you are finished
adjusting the screen contrast, press the ENT pushbutton; this process is a
shortcut for changing the LCD contrast setting FP_CONT in the front-panel
settings.
Front-Panel Automatic Messages
The relay displays automatic messages that override the rotating display under
the conditions described in Table 8.1. Relay failure has the highest priority,
followed by trip and alarm when the front-panel setting
FP_AUTO := OVERRIDE.
If the front-panel setting FP_AUTO := ROTATING, then the rotating display
messages continue and any TRIP or ALARM message is added to the rotation.
Relay failure still overrides the rotating display.
Front-Panel Security
Front-Panel Access Levels
The SEL-751 front panel typically operates at Access Level 1 and provides
viewing of relay measurements and settings. Some activities, such as editing
settings and controlling output contacts, are restricted to those operators who
know the Access Level 2 passwords.
NOTE: The reduced SEL-751 model
with four pushbuttons does not
support AUX 1 through AUX4
(i.e., PB05 through PB08).
NOTE: See the Preface for an
explanation of typographic
conventions used to describe menus,
the front-panel display, and the front-
panel pushbuttons.
Table 8.1 Front-Panel Automatic Messages (FP_AUTO := OVERRIDE)
Condition Front-Panel Message
Relay detecting any failure Displays the type of latest failure (see Section 11: Testing
and Troubleshooting).
Relay trip has occurred Displays the type or cause of the trip. Refer to Table 10.1
for a list of trip display messages.
Relay alarm condition has
occurred
Displays the type of alarm. The TRIP LED is also flashing
during an alarm condition. See Tab le 8.3 for a list of the
alarm conditions.