Schweitzer Engineering SEL-387-0 - Page 135

4.9
Date Code 20170601 Instruction Manual SEL-387-0, -5, -6 Relay
Control Logic
SEL
OGIC Control Equation Sets (1—3) Variables
The format of the setting names for these variables is as follows:
Timers SnVmPU and SnVmDO have a setting range of about 4.63 hours:
0.00 through 999999.00 cycles in 0.125-cycle increments
The two types of variables are discussed in the following paragraphs.
Variables/Timers
Figure 4.3 shows the logic for the variables and timers. A SELOGIC control
equation defines the variable SnVm. When this equation is true, the Relay
Word bit SnVm is asserted. If SnVm remains true for the length of the
SnVmPU setting, in cycles, the timer output asserts the Relay Word bit
SnVmT (variable timed out). If SnVm deasserts, SnVmT will deassert
SnVmDO cycles later.
Figure 4.3 Timed Variables in SELOGIC Control Equation Sets
There are 16 variables of this type spread through the three SELOGIC control
equation sets.
Ta b le 4. 4 SE L OGIC Control Equation Variables (SEL-387-0 Relay Only)
SELOGIC Control
Equation Set
Timers
Latch Control Switches
(Latch Bits)
144
244
380
Ta b le 4. 5 SE L
OGIC Control Equation Variables (All But SEL-387-0 Relay)
SELOGIC Control
Equation Set
Timers
Latch Control Switches
(Latch Bits)
144
244
388
Timed Variable
Name: SnVm (n = Set Number; m = Variable Number)
Timer Pickup
Delay: SnVmPU (cycles)
Timer Dropout
Delay: SnVmDO (cycles)
Set Latch Bit: SnSLTm
Reset Latch Bit: SnRLTm (Reset takes precedence over Set)
S
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nVm
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uation
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S
nVmP
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S
nVmD
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n =
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E
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OG
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control e
q
uation set number
m = Variable number
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