ABB SM2000 User Manual page 71

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...4.6.4 Alarm Configuration
Note. Delayed process alarms only – see Fig. 4.15.
Set the value, in engineering units, at which the alarm is to
activate.
Set the hysteresis value in engineering units and the delay
time in seconds.
Output
0
40
0
Time in seconds (s)
Timer
Timer
Timer
Started
Reset
Started
The delay time is the period of time for which alarm activation
is delayed after the enable signal is switched on. Once the
delay time has expired, the alarm operates in the same
manner as a standard High/Low process alarm.
Notes.
• Rate alarms only – see Fig. 4.14.
• A rate alarm remains active until the rate has been within
limits for at least one complete Alarm Period.
Set the minimum or maximum amount of deviation allowed
within the Rate Alarm Period before the alarm is activated.
Set the time period over which the deviation is measured. For
high rate alarms, the alarm becomes active if the value
changes by more than the devation value within the alarm
period. For low rate alarms, the alarm becomes active if the
channel value changes by less than the deviation within the
alarm period.
Set the filter time to be used to reduce the number of
spurious alarm trips. The source signal is averaged over the
filter period prior to the rate alarm being determined.
4 CONFIGURATION...
Alarm
Trip Point
70
130
Alarm On
Alarm Off
Hysteresis
Timer
Time
Reset
Elapsed
69

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