ABB SM3000 User Manual page 92

...4 CONFIGURATION
...4.6.4 Alarm Configuration
90
Set the minimum or maximum amount of deviation allowed
within the alarm 'Period' (see below) before the alarm is
activated.
Note. Rate alarms only – see Fig. 4.17.
Set the time period over which the deviation is measured. For
fast rate alarms, the alarm becomes active if the value
changes by more than the devation value within the alarm
period. For slow rate alarms, the alarm becomes active if the
channel value changes by less than the deviation within the
alarm period.
Notes.
• Rate alarms only – see Fig. 4.17.
• 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. Rate alarms only – see Fig. 4.17.
Select an alarm Enable source. 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
Fig. 4.18.
Set to 'On' to record all changes in the alarm state in the
Alarm event log – see Section 2.8.
Assign the alarm to one or more of 12 groups.
The alarm states assigned to each group are 'ORed'
together to create an internal digital signal that may be
assigned to relays, digital outputs or internal digital controls.
alarm operation, see