7-42 Inputs, Outputs, Timers, and Other Control Logic Date Code 20001006
SEL-351 Instruction Manual
Circuit Breaker Closed
In Figure 7.32, optoisolated input IN1 is energized when the 52a circuit breaker auxiliary contact
is closed, resulting in:
52A = IN1 = logical 1
DP2 = 52A = logical 1
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
This results in the display of corresponding text setting DP2_0 on the front-panel display:
BREAKER OPEN
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 = 52A (52a circuit breaker auxiliary contact connected to
input IN1 – see Figure 7.32)
DP2_1 = BREAKER CLOSED (displays when DP2 = logical 1)
DP2_0 = (blank)
Circuit Breaker Closed
In Figure 7.32, optoisolated input IN1 is energized when the 52a circuit breaker auxiliary contact
is closed, resulting in:
52A = IN1 = logical 1
DP2 = 52A = logical 1
Courtesy of NationalSwitchgear.com
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