2.5.4.3Alarm and Warning Trigger Conditions
The diagram above illustrates the Alarm and Warning trigger conditions for the engine coolant temperature as an example.
The Warning threshold is set at 105° C, where the Alarm threshold is reached at 110° C. To prevent repeated on/off cycles of
the Warning or the Alarm an activation hysteresis is applied. Therefore in above example an Alarm is turned off, if the tempe-
rature falls below 108° C and the warning is cancelled at 103° C. The hysteresis is 2° C in this case and is the same for both
Alarm- and Warning condition. In addition a turn-on delay from 1 sec to 4 minutes can be configured. The delay time starts,
when the threshold is reached. If the input value falls below the threshold value, then the delay time restarts from this point in
time.
It can be configured, that the Warning is triggered, if a value rises above a threshold (as in the case of the engine coolant
temp.), or if the input value falls below a threshold (e.g. fuel level).
2.5.4.4Alarm and Warning Trigger enabling with Engine running
Triggering of some Alarms and Warnings only makes sense, when the engine is actually running. Examples are engine oil
pressure or hydraulic pressure. For these situations triggering an Alarm and Warning can be disabled until the engine is run-
ning. This conditional trigger enable is selectable for every Alarm and Warning (together) during configuration.
Engine running is detected, by exceeding a separately configurable threshold value: the Alarm and Warning enable engine
speed threshold. The minimum threshold is 0 rpm and the maximum is 32.000 rpm.
An additional trigger-enable time delay starting from engine running condition can be configured. This is helpfull in cases,
where it takes a while until a pressure is built up.
This delay time is settable from 0 to 250 sec with a resolution of 1sec.
2. Functional Specification
Product Manual
T/°C
time/sec
105
103
110
108
Warning
on
Alarm on
Alarm off
Warning off
Technische Änderungen vorbehalten Technical details subject to change
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TU00-0726-0000002
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Summary of Contents for CANcockpit Series
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