Schweitzer Engineering SEL-351P, Quick Start Manual

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1-46 Factory-Set Logic Date Code 990215
SEL-351P Manual Técnico
pressed and a pending close or trip results (and LED flashes), as described in Figure SECTION
1: .35 and
Figure SECTION 1: .36.
FECHAR and ABRIR operator control outputs (Relay Word bits PB8 and PB9) are routed into
close logic (see Figure SECTION 1: .20) and trip logic (see Figure SECTION 1: .19),
respectively.
Time delay PB8D
Corresponding
Relay Word Bit
Output
PB8
FECHAR
operator control
pushbutton
Pressed momentarily
for random length of
time
The corresponding RELIGADOR FECHADO LED flashes during the timing of time delay
PB8D. This flashing indicates a pending pulsing of Relay Word Bit PB8, regardless of the
setting of corresponding SEL
OGIC
Control Equation setting LED8.
If the FECHAR operator control pushbutton is pressed again (or the ABRIR operator control
pushbutton is pressed) while PB8D is timing, the RELIGADOR FECHADO LED stops
flashing, PB8D stops timing, and Relay Word Bit PB8 is not pulsed. The pending close
operation is aborted. The RELIGADOR FECHADO LED returns to its regular operation, per
SEL
OGIC
Control Equation setting LED8 (see Figure 1.32).
If time delay setting PB8D is set PB8D>0, then the assertion of SEL
OGIC
setting ULCL
(unlatch close) to logical 1 also aborts pending closes and prevents the FECHAR operator
control pushbutton from starting a pending close in the first place. See Figure 1.21.
If time delay setting PB8D is set PB8D=0 (no time delay), then Relay Word bit PB8 functions
in a manner similar to Figure 1.33.
Pulses to logical 1
for one processing
interval (1/4 cycle)
DWG: MP351P025
Figure SECTION 1: .35 : FECHAR Operator Control Pushbutton Output