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
, 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
. 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
Front-Panel Display Message Settings on page 4.44 in Section 4:
. 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
Содержание SEL-701
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