ABB OMD100 - Manual Back Switching

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AUTOMATIC CONTROL UNIT, OMD100
AUTOMATIC CONTROL UNIT, OMD100
Figure 3.3 Automatic Switching Sequence, manual back switching
Ts: Switching delay, Tbs:Back switching delay
3.1.3 Manual back switching
The switching sequence can be summarized in following steps:
An anomaly occurs on the Line 1
Switching delay
Change-over switch (Switch I) to the position O
Change-over switch (Switch II) to the position II
And the back switching sequence can be summarized in the following steps:
The Line 1 will start the normal functioning
Change-over switch stays in position II
An anomaly occurs on the Line 2
Back switching delay
Change-over switch (Switch II) to the position O
The Line 2 will start the normal functioning
Switching delay
Change-over switch (Switch II) to the position II
LINE 1
LINE 2
Switch I status
A07252
Switch II status
Ts
Tbs
Ts