Schweitzer Engineering SEL-351P - Settings Examples

7-8 Inputs, Outputs, Timers, and Other Control Logic Date Code 990215
SEL-351P Manual Técnico
ON/OFF/MOMENTARY X X X X
Disable local control switches by “nulling out” all the label settings for that switch (see
Section 9: Setting the SEL-351P Recloser Control). The local bit associated with this disabled
local control switch is then fixed at logical 0.
Settings Examples
Local bits LB3 and LB4 are used in a few of the factory SEL
OGIC Control Equation settings for
manual trip and close functions. Their corresponding local control switch position labels are set
to configure the switches as OFF/MOMENTARY switches:
Local Bit
Label Settings Function
LB3 NLB3 = MANUAL TRIP trips breaker and drives reclosing relay to
lockout
CLB3 = RETURN OFF position (“return” from MOMENTARY
position)
SLB3 = ON position – not used (left “blank”)
PLB3 = TRIP MOMENTARY position
LB4 NLB4 = MANUAL CLOSE closes breaker, separate from automatic
reclosing
CLB4 = RETURN OFF position (“return” from MOMENTARY
position)
SLB4 = ON position – not used (left “blank”)
PLB3 = CLOSE MOMENTARY position
Figure SECTION 7: .7 and Figure SECTION 7: .8 show local control switches with factory
settings.
Figure SECTION 7: .7: Configured Manual Trip Switch Drives Local Bit LB3
Local bit LB3 is set to trip in the following SEL
OGIC Control Equation trip setting example (see
Figure 5.1 in Section 5: Trip and Target Logic):
TR = ... + LB3 + ...