4.78
SEL-787 Relay Instruction Manual Date Code 20081022
Protection and Logic Functions
Logic Settings (SET L Command)
If the math variable (MV01) is not equal to 45 in value, output contact
OUT102 asserts (effectively OUT102 := logical 1). If the math variable
(MV01) is equal to 45 in value, output contact OUT102 deasserts (effectively
OUT102 := logical 0). Table 4.28 shows other operators and values that you
can use in writing SEL
OGIC control equations.
Timers Reset When
Power Lost or
Settings Changed
If the device loses power or settings change, the SELOGIC control equation
variables/timers reset. Relay Word bits SVn and SVnT (n = 01–32) reset to
logical 0 after power restoration or a settings change. Figure 4.50 shows an
effective seal-in logic circuit, created by the use of Relay Word bit SV07
(SEL
OGIC control equation variable SV07) in SELOGIC control equation
SV07:
SV07 = (SV07 OR OUT101) AND (OUT102 OR OUT401)
Figure 4.50 Example Use of SELOGIC Variables/Timers
SV/Timers Settings
The SEL-787 includes 32 SELOGIC variables. Table 4.29 shows the pickup,
dropout, and equation settings for SV01 through SV05. The remaining
SEL
OGIC variables are not enabled (see Table 4.25).
Ta b l e 4 . 28 O t h e r S E L OGIC Control Equation Operators/Values
Operator/
Value
Function
Function Type
(Boolean and/or
Mathematical)
0Set SELOGIC control equation directly to logical 0
(XXX := 0)
Boolean
1Set SEL
OGIC control equation directly to logical 1
(XXX := 1)
Boolean
# Characters entered after the # operator are not
processed and deemed as comments
Boolean and
Mathematical
\ Indicates that the preceding logic should be
continued on the next line (“\” is entered only at the
end of a line)
Boolean and
Mathematical
SV06PU
SV06D0
SV07PU
SV07D0
SV06
SV07
OUT101
OUT102
OUT103
OUT401
OUT101
OUT102
OUT401
Ta b le 4. 29 SE LOGIC Variable Settings (Sheet 1 of 2)
Setting Prompt Setting Range Default Settings
SV TIMER PICKUP 0.00–3000.00 sec SV01PU := 3.00
SV TIMER DROPOUT 0.00–3000.00 sec SV01DO := 0.00
SV INPUT SEL
OGIC SV01 := PB01
SV TIMER PICKUP 0.00–3000.00 sec SV02PU := 0.25
SV TIMER DROPOUT 0.00–3000.00 sec SV02DO := 0.00
SV INPUT SEL
OGIC SV02 := PB01 OR PB02 OR
PB03 OR PB04
SV TIMER PICKUP 0.00–3000.00 sec SV03PU := 0.00
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