Schweitzer Engineering Laboratories SEL-311L, Instruction Manual, Page: 275 / 734

Date Code 20010625 Inputs, Outputs, Timers, and Other Control Logic 7-23
SEL-311L Instruction Manual
Table 7.5: SEL
OGIC
Control Equation Settings for Switching Active Setting Group
Between Setting Groups 1 and 4
Setting Group 1 Setting Group 4
SV8 = SG1 SV8 = SG4
SS1 = 0 SS1 = IN105 * SV8T
SS2 = 0 SS2 = 0
SS3 = 0 SS3 = 0
SS4 = IN105 * SV8T SS4 = 0
SS5 = 0 SS5 = 0
SS6 = 0 SS6 = 0
SEL
OGIC
control equation timer input setting SV8 in Table 7.5 has logic output SV8T, shown in
operation in Figure 7.19 for both setting Groups 1 and 4.
Figure 7.19: SEL
OGIC
Control Equation Variable Timer SV8T Used in Setting Group
Switching
In this example, timer SV8T is used in both setting groups—different timers could have been
used with the same operational result. The timers reset during the setting group change, allowing
the same timer to be used in both setting groups.
Timer pickup setting SV8PU is set greater than the pulse width of the SCADA contact
(Figure 7.18). This allows only one active setting group change (e.g., from setting Group 1 to 4)
for each pulse of the SCADA contact (and subsequent assertion of input IN105). The functions
of the SEL
OGIC
control equations in Table 7.5 are explained in the following example.