ABB SM1000 User Manual page 61

...4.6.4 Alarm Configuration
Deviation
Period
Rate filter
See Appendix 1
Enable source
Log enable
0.0%
0 Secs
0 Secs
On
Set the minimum or maximum amount of deviation allowed
within the Rate Alarm Period before the alarm is activated
Note. Fast/Slow rate alarms only – see Fig. 4.15.
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.
Notes.
• Fast/Slow rate alarms only – see Fig. 4.15.
• A rate alarm remains active until the rate has been within
limits for at least one complete 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.
Note. Fast/Slow rate alarms only – see Fig. 4.15.
When the 'Enable source' is active, the alarm is enabled.
When the source is inactive the alarm is disabled. If set to
'None' the alarm is always enabled.
Note. For Delayed Process alarm operation, see
Fig. 4.16.
Set to 'On' to record all changes in the alarm state in the
Alarm event log – see Section 2.7.
4 CONFIGURATION...
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