Schweitzer Engineering SEL-351P - Page 346

7-22 Inputs, Outputs, Timers, and Other Control Logic Date Code 990215
SEL-351P Manual Técnico
Table SECTION 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 = IN5 * SV8T
SS2 = 0 SS2 = 0
SS3 = 0 SS3 = 0
SS4 = IN5 * SV8T SS4 = 0
SS5 = 0 SS5 = 0
SS6 = 0 SS6 = 0
SEL OGIC Control Equation timer input setting SV8 in Table SECTION 7: .5 has logic output
SV8T, shown in operation in
Figure SECTION 7: .19 for both setting groups 1 and 4.
Figure SECTION 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 SECTION 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).