Date Code 20001006 Close and Reclose Logic 6-5
SEL-351 Instruction Manual
or
52A = !IN1 (52b auxiliary contact wired to input IN1)
then if breaker status is used in other SELOGIC Control Equations, it can be entered as 52A - the
user doesn’t have to enter IN1 (for a 52a) or !IN1 (for a 52b). For example, refer to Rotating
Default Display in Section 7: Inputs, Outputs, Timers, and Other Control Logic. In the factory
settings, circuit breaker status indication is controlled by display point setting DP2:
DP2 = 52A
Program an Output Contact for Closing
In the factory settings, the resultant of the close logic in Figure 6.1 is routed to output contact
OUT2 with the following SELOGIC Control Equation:
OUT2 = CLOSE
See Output Contacts in Section 7: Inputs, Outputs, Timers, and Other Control Logic for more
information on programming output contacts.
RECLOSE SUPERVISION LOGIC
Note that one of the inputs into the close logic in Figure 6.1 is:
Reclosing Relay Open Interval Time-Out (qualified by 79CLS)
This input into the close logic in Figure 6.1 is the indication that a reclosing relay open interval has
timed out (see Figure 6.6), a qualifying condition (SELOGIC Control Equation setting 79CLS) has
been met, and thus automatic reclosing of the circuit breaker should proceed by asserting the
CLOSE Relay Word bit to logical 1. This input into the close logic in Figure 6.1 is an output of
the reclose supervision logic in the following Figure 6.2.
Courtesy of NationalSwitchgear.com
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