Schweitzer Engineering Laboratories SEL-351-5, Instruction Manual

Page: 294 / 706

7.26
SEL-351-5, -6, -7 Relay Instruction Manual
Date Code 20070117
Inputs, Outputs, Timers, and Other Control Logic
Multiple Setting Groups
Figure 7.23 Active Setting Group Switching (With Rotating Selector Switch)
Time Line
Active Setting Group
Retained
Power Loss
The active setting group is retained if power to the relay is lost and then
restored. If a particular setting group is active (e.g., setting Group 5) when
power is lost, it comes back with the same setting group active when power is
restored.
Settings Change
If individual settings are changed (for the active setting group or one of the
other setting groups), the active setting group is retained, much like in the
preceding
Power Loss explanation.
If individual settings are changed for a setting group other than the active
setting group, there is no interruption of the active setting group (the relay is
not momentarily disabled).
If the individual settings change causes a change in one or more SEL
OGIC
control equation settings SS1–SS6, the active setting group can be changed,
subject to the newly enabled SS1–SS6 settings.
5
3 Remote 4 5 4 3 2 1
Switch
Position
SG1
IN101
IN102
IN103
TGR
3
SG5
SG6
Active
Setting
Group
SG2
SG3
SG4