8.18
SEL-387-0, -5, -6 Relay Instruction Manual Date Code 20170601
Front-Panel Interface
Rotating Default Display
Circuit Breaker Open
The optoisolated input IN1 is de-energized when the 52a circuit breaker
auxiliary contact is open, resulting in:
DP2 = IN102 = logical 0
This results in the display of corresponding text setting DP2_0 on the front-
panel display.
Display Only One Message Example
To display just one screen, but not its complement, set only one of the text
settings. For example, to display just the
Breaker Closed condition, but not
the
Breaker Open condition, make the following settings:
DP2 = IN102 (52a circuit breaker auxiliary contact connected to input
IN102)
DP2_1 = BREAKER 2 CLOSED (displays when DP2 = logical 1)
DP2_0 = (blank)
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.
Circuit Breaker Open
The optoisolated input IN102 is de-energized when the 52a circuit breaker
auxiliary contact is open, resulting in:
DP2 = IN102 = logical 0
Corresponding text setting DP2_0 is not set (it is “blank”), so no message is
displayed on the front-panel display.
Dynamic Display
You can display relay time-overcurrent pickup settings, metering values,
breaker wear monitor values, and RTD readings on the SEL-387 front-panel
LCD (subject to the number of available Display Points); these dynamic
Display Points reflect actual settings and values in the relay and are in
addition to the programmable text discussed previously. The relay displays
these settings and metering quantities on the rotating default display.
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