Date Code 20001006 Inputs, Outputs, Timers, and Other Control Logic 7-43
SEL-351 Instruction Manual
This results in the display of corresponding text setting DP2_1 on the front-panel display:
BREAKER CLOSED
Circuit Breaker Open
In Figure 7.32, optoisolated input IN1 is deenergized when the 52a circuit breaker auxiliary
contact is open, resulting in:
52A = IN1 = logical 0
DP2 = 52A = 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-351 Relay is protecting a 12 kV distribution feeder, labeled “Feeder 1204,” the feeder
name can be continually displayed with the following settings
DP5 = 1 (set directly to logical 1)
DP5_1 = FEEDER 1204 (displays when DP5 = logical 1)
DP5_0 = (“blank”)
This results in the continual display of text setting DP5_1 on the front-panel display:
FEEDER 1204
This can also be realized with the following settings:
DP5 = 0 (set directly to logical 0)
DP5_1 = (“blank”)
DP5_0 = FEEDER 1204 (displays when DP5 = logical 0)
This results in the continual display of text setting DP5_0 on the front-panel display:
FEEDER 1204
Courtesy of NationalSwitchgear.com
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