Schweitzer Engineering Laboratories SEL-387-0, Instruction Manual

Page: 149 / 568

4.11
Date Code 20050919
Instruction Manual SEL-387-0, -5, -6 Relay
Control Logic
SEL
OGIC
Control Equation Sets (1 Through 3) Variables
SEL
OGIC
Control Equation
Sets (1 Through 3) Variables
Each setting group (1 through 6) has three sets of SEL
OGIC
control equation
variables for use in constructing SEL
OGIC
control equations. In the SEL-387
these variables are of two types:
➤
Timed variables
➤
Latch bits
The variables are processed in the order in which they appear in the Setting
Sheets. If variables that appear earlier are used as input to later variables, the
processing of both will occur within the same processing interval. If a later
variable is an input to an earlier variable, the scheme output will be delayed
one processing interval.
The SEL
OGIC
control equation sets must be enabled by Group settings
ESLS1, ESLS2, and/or ESLS3 in the configuration settings.
There are timed variables and latch bits available to the user. The three
SEL
OGIC
control equation sets have different mixes of variable types, as
shown below in Table 4.4 and Table 4.5 .
The format of the setting names for these variables is as follows:
Timers S n V m PU and S n V m DO 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.
Table 4.4 SEL
OGIC
Control Equation Variables (SEL-387-0 Relay Only)
SEL
OGIC
Control
Equation Set
Timers
Latch Control Switches
(Latch Bits)
1 4 4
2 4 4
3 8 0
Table 4.5 SEL
OGIC
Control Equation Variables (All But SEL-387-0 Relay)
SELOGIC Control
Equation Set
Timers
Latch Control Switches
(Latch Bits)
1 4 4
2 4 4
3 8 8
Timed Variable
Name: S n V m ( n = Set Number; m = Variable Number)
Timer Pickup
Delay: S n V m PU (cycles)
Timer Dropout
Delay: S n V m DO (cycles)
Set Latch Bit: S n SLT m
Reset Latch Bit: S n RLT m (Reset takes precedence over Set)