ABB SM3000 User Manual page 99

SM3000
Multipoint Videographic Recorder
IM/SM3000–EN Rev. L
Set the period of time for which to delay alarm activation after
the enable signal is switched on. Once the delay time has
expired, the alarm operates in the same way as a standard
process alarm.
Note. Delayed process alarms only.
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. 6.17, page 94.
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 deviation 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.
Note.

Rate alarms only – see Fig. 6.17, page 94.

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. 6.17, page 94.
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 alarm operation, see Fig. 6.18,
page 95.
Set to 'On' to record all changes in the alarm state in the Alarm
event log – see Section 4.8, page 34.
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.
6 Configuration
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