8.17
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Front-Panel Interface
Rotating Default Display
Rotating Default Display
Rotating default displays on the relay front panel replace indicating panel
lights. Traditional indicating panel lights are turned on and off by circuit
breaker auxiliary contacts, front-panel switches, SCADA contacts, etc. They
indicate such conditions as circuit breaker open/closed.
Traditional Indicating
Panel Lights Replaced
With Rotating Default
Display
The indicating panel lights are not needed if the rotating default display
feature in the SEL-387 is used.
There are 16 of these default displays available in the SEL-387. Referred to as
Display Points, each default display has available two complementary screens
(e.g.,
BREAKER CLOSED and BREAKER OPEN). The settings for these Display
Points are located in the FRONT PANEL area of the Global settings. They are
viewable and settable from the serial ports, via the SHO G or SET G
commands. Since they include SEL
OGIC control equations and variable text,
they cannot be accessed from the front panel.
General Operation of
Rotating Default
Display Settings
SELOGIC control equations display point setting DPn (n = 1 through 16)
controls the display of corresponding, complementary text settings:
DPn_1 (displayed when DPn = logical 1)
DPn_0 (displayed when DPn = logical 0)
Make each text setting through the serial port using the command SET G.
View these text settings using the serial port command SHO G. These text
settings are displayed in pairs on the SEL-387 front-panel display in rotation.
Global setting SCROLD determines how long each pair is displayed. The text
settings must not be longer than 16 characters maximum. Any active Display
Points take precedence as the default display over the standard scroll through
the winding current values. Relay-generated messages, however, take
precedence over the Display Points.
Below are some examples of how the Display Points can be used.
Circuit Breaker Status Indication Example
Make SELOGIC control equations display point setting DP2:
DP2 = IN102 (IN102 is assigned to the 52A2 function for Breaker 2)
Make corresponding, complementary text settings:
DP2_1 = BREAKER 2 CLOSED
DP2_0 = BREAKER 2 OPEN
Display point setting DP2 controls the display of the text settings.
Circuit Breaker Closed
The optoisolated input IN102 is energized when the 52a circuit breaker
auxiliary contact is closed, resulting in:
DP2 = IN102 = logical 1
This results in the display of corresponding text setting DP2_1 on the front-
panel display.
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