West Control Solutions N6600 - Manual (Page 8)

1.2.2 Alarms
Alarms allow early warning (and automatic corrective action, if necessary) in the
event of abnormal process conditions - heater failure, sensor failure, human error
etc. In addition to giving visual indication of such conditions, alarms can be
connected to outputs; the Controller can intervene automatically as soon as it
detects a problem in the plant.
Two standard alarms are provided which warn if the process variable temperature
moves outside prescribed limits. These alarms can be set to react if the process
variable goes above or below specific temperatures or moves too far away from
the setpoint. In the latter case, the alarm settings need no re-adjustment if the
setpoint is changed.
Heater break alarms allow prompt detection of heater failure, minimising the risk
of damage to the process. Three different types of alarm are provided, permitting
the majority of heater failures to be handled effectively. The actual heater current
can be displayed on the front panel.
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