4.165
Date Code 20170927 Instruction Manual SEL-751 Relay
Protection and Logic Functions
Logic Settings (SET L Command)
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 4.97 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 4.97 Example Use of SELOGIC Variables/Timers
SV/Timers Settings
The SEL-751 includes 32 SELOGIC variables. Table 4.62 shows the pickup,
dropout, and equation settings for SV/Timers.
Ta b l e 4 . 61 O t h e r S E LOGIC 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 . 62 S E LOGIC Variable Settings (Sheet 1 of 2)
Setting Prompt Setting Range
Setting Name := Factory
Default
SV TIMER PICKUP 0.00–3000.00 SV01PU := 0.00
SV TIMER DROPOUT 0.00–3000.00 SV01DO := 0.00
SV INPUT SEL
OGIC SV01 := NA
SV TIMER PICKUP 0.00–3000.00 SV02PU := 3.00
SV TIMER DROPOUT 0.00–3000.00 SV02DO := 0.00
SV INPUT SEL
OGIC SV02 := PB02
SV TIMER PICKUP 0.00–3000.00 SV03PU := 0.00
SV TIMER DROPOUT 0.00–3000.00 SV03DO := 0.00
SV INPUT SEL
OGIC SV03 := LT03
SV TIMER PICKUP 0.00–3000.00 SV04PU := 0.00
SV TIMER DROPOUT 0.00–3000.00 SV04DO := 0.00
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