7.39
Date Code 20060320 Instruction Manual SEL-311C Relay
Inputs, Outputs, Timers, and Other Control Logic
Rotating Default Display (Only on Models With LCD)
This results in the display of corresponding text setting DP2_0 on the front-
panel display:
Additional Settings
Examples
Display Only One Message
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 = IN101 (52a circuit breaker auxiliary contact connected to input IN101–
see Figure 7.30)
DP2_1 = BREAKER CLOSED (displays when DP2 = logical 1)
DP2_0 = (blank)
Circuit Breaker Closed
In Figure 7.30, optoisolated input IN101 is energized when the 52a circuit
breaker auxiliary contact is closed, resulting in:
DP2 = IN101 = logical 1
This results in the display of corresponding text setting DP2_1 on the front-
panel display:
Circuit Breaker Open
In Figure 7.30, optoisolated input IN101 is de-energized when the 52a circuit
breaker auxiliary contact is open, resulting in:
DP2 = IN101 = logical 0
Corresponding text setting DP2_0 is not set (it is “blank”), so no message is
displayed on the front-panel display.
Continually Display a Message
To continually display a message in the rotation, set the SELOGIC control
equation display point setting directly to 0 (logical 0) or 1 (logical 1) and the
corresponding text setting. For example, if an SEL-311C is protecting a
230 kV transmission line, labeled “Line 1204,” the line name can be
continually displayed with the following settings:
DP5 = 1 (set directly to logical 1)
DP5_1 = LINE 1204 (displays when DP5 = logical 1)
DP5_0 = (“blank”)
BREAKER OPEN
BREAKER CLOSED
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