ABB OMD100 - Change-Over Switch Does Not Respond

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AUTOMATIC CONTROL UNIT, OMD100
AUTOMATIC CONTROL UNIT, OMD100
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9.3 Change-over switch does not respond
During the switching sequence, the OMD100 operates the change-over switch (Switch I) first to the
position O from position I. If this transition is not completed in three seconds, the Open 1 Failure is
activated. If switching to the position O is completed, but the transition (Switch II) from O to II fails,
the Close 2 Failure is activated. These alarms will lock the switching logic and can only be reset by
pushing the AUTO key.
During the back switching sequence, similiar transitions will be perfomed from II to O and from O
to I, possibly activating Open 2 Failure or Close 1 Failure.
Figure 9.1 Unsuccesful switching sequence
Figure 9.2 Succesful switching sequence
Close Switch II Close the switch II on LN2
(max. operating duration 3 s)
Switch I status The switch I in position I -status
Switch II status The switch II in position II -status
A04154
Close Switch II
Switch I status
Switch II status
Alarm
Close Switch II
Switch I status
Switch II status
Alarm
Open 1 Failure Close 2 Failure
3 s3 s
Close Switch II
Switch I status
Switch II status
Alarm
A04153
Close
Open
A04231