Schweitzer Engineering Laboratories SEL-701 - Normal Front-Panel Display; Figure 5.2 Default Meter Display Screen; Figure 5.3 Default Display Message Screen

701 Motor Protection Relay Date Code 20010719
Front-Panel Operation
Normal Front-Panel Display
5.2
Normal Front-Panel Display
In normal operation, the Relay Enabled LED should be lit. Usually, you will find
the front-panel vacuum fluorescent display dark. The relay is equipped with a
front-panel timeout setting (see Front-Panel Configuration Settings on page 4.43 in
Section 4: Settings Calculation) that extends the life of the vacuum fluorescent display
and improves front-panel security. After a settable period of inactivity, usually 15
minutes, the relay automatically shuts off the display. If the front panel was in Access
Level 2, it automatically returns to Access Level 1 when the display times out.
To activate the display, press the {ESC} pushbutton.
When the front-panel display is active, the relay can place several screens in a
rotation, showing each screen for about two seconds before moving to the next. The
default meter screen, shown in Figure 5.2, includes the phase current and maximum
phase-to-phase voltage magnitudes. If the relay is equipped with optional voltage
and/or RTD inputs, you can enable the relay to add real and reactive power, power
factor, and frequency meter screens and/or the temperatures of the hottest RTDs to the
default rotation.
Figure 5.2 Default Meter Display Screen.
The relay automatically displays custom text messages in rotation with the meter
screens. The factory default settings define three display messages. Two of these
messages are always included in the default display rotation and are shown in
Figure 5.3. The third is only shown if an RTD failure is detected.
Figure 5.3 Default Display Message Screen.
Control the contents of these custom messages using the Display Message
settings, described in Front-Panel Display Message Settings on page 4.44 in Section 4:
Settings Calculation. If you wish to change the conditions under which the relay
displays a message, refer to Appendix B: SELogic® Control Equations & Relay Logic.
IA= 10.8 IB= 10.8
IC= 10.9 V= 481V
SEL-701
MOTOR RELAY