ABB OMD800 - Line 2 Priority

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AUTOMATIC CONTROL UNIT, OMD800
AUTOMATIC CONTROL UNIT, OMD800
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3.1.3 Line 2 priority
The switching sequence of OMD800 can be summarized in following steps:
An anomaly occurs on the Line 2
Switching delay
If Pre-transfer signal active: Pre-transfer output on,
Pre-transfer II to I delay
Change-over switch (Switch II) to the position O
Dead band II to I delay
Change-over switch (Switch I) to the position I
If Pre-transfer signal active: Pre-transfer output off
And the back switching sequence can be summarized in the following steps:
The Line 2 will start the normal functioning
Back switching delay
If Pre-transfer signal active: Pre-transfer signal output on,
Pre-transfer I to II delay
Change-over switch (Switch I) to the position O
Dead band I to II delay
Change-over switch (Switch II) to the position II
If Pre-transfer signal active: Pre-transfer signal output off
Figure 3.3 Automatic Switching Sequence, Line 2 priority
Ts: Switching delay, DBs: Dead band II to I, TBs: Back switching delay, Ds: Dead band I to II
Please note that generator cannot be in use, when priority is set to Line 2
(see page 34 Generator usage).
Ts DBs TBs Ds
LINE 1
LINE 2
Switch I status
Switch II status