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Alarms
Signals
If equipment is connected that has lower limits than the system, the alarm levels must
be set accordingly.
If an analog or digital signal passes the predetermined alarm level, several things happen
at once:
•
The system is set to Pause mode.
•
The valves and other components on the system are set to their default positions.
The Valve Pause Function can be enabled in UNICORN for certain components (air trap,
column) to retain the original valve positions.
Test
To test a specific instrument alarm it is possible to lower the alarm limit for the instrument
below the current process value.
Reset
The alarm is reset through the control system by acknowledging the alarm message.
The process can be started again using the Continue function in UNICORN, if the situation
has been rectified.
Differences between UNICORN 5
and UNICORN 7
In UNICORN 5 you start the three installation wizards (Flow Kit Installation with Compo-
nent Test, Troubleshoot Failed Component Test and Column Installation) by clicking
Instant Run on the File menu in the System Control module.
In UNICORN 7 you start the same wizards by clicking New Method on the File menu in
the Method Editor module. The installation wizard will create a method that you must
save and then run in the System Control module.
The content of these methods are the same for UNICORN 5 and UNICORN 7. They are
described in
Chapter 6 Flow kit installation, on page 77
failed component test, on page 117
and
Chapter 9 Column installation, on page 122
In UNICORN 5 there is limited method editing support from the column list in
UNICORN. In UNICORN 7 the user must enter column parameters manually,
see
Edit column parameters in UNICORN 7, on page 130
.
Note:
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ÄKTA ready Operating Instructions 28960345 AD
3 System description
3.5 UNICORN control system