MULTI-POINT CIRCULAR-CHART RECORDER: USER GUIDE
Page 47
HA250385
Issue 7 Nov 06
Conf:Channel 1
Threshold 100.00
Enable Off
Type Absolute low
Dwell 10s
Alarm : Setpoint
Hysteresis 0.00
Scrolls through
Off, Unlatched, Latched, Trigger
Use up/down arrows and cursor
to enter values.
Max 2047s
Channel : Range
Channel : Alarm 1
Channel : Trace
Alarm : Job 1
Scrolls through Absolute low/high,
Deviation in/out, Rate of change rise/fall.
Use arrow keys to select channel
Use arrow keys to select alarm 1 to 4
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4.5.2 Alarm configuration
Up to four alarms can be configured for each channel. For absolute and deviation alarms, a hysteresis value can be
entered to prevent spurious triggering should the process value 'hover' around the alarm threshold. For all types of
alarm, a dwell (or waiting) period can be configured, and if the alarm clears within this period, the alarm is ignored.
Each alarm can initiate up to two jobs, as described in
SETPOINT CONFIGURATION
Allows you to set up alarm type, threshold value, hysteresis etc. Figure 4.5.2a shows display pages for absolute
alarms. For deviation and rate-of-change alarms, some of the display pages will be different from those shown.
Figure 4.5.2a Alarm configuration pages: Absolute alarms.
ENABLE
Off, Unlatched, latched or trigger can be selected for the alarm, using the up or down arrow key.
Off
The alarm is disabled
Unlatched
When triggered, the alarm stays active until the triggering source returns to a non-alarm state. Alarm
indicators flash until acknowledged, then stay permanently on until the alarm is no longer active.
Alarm messages can be printed on the chart if alarm jobs trigger Customer Messages.
Latched
When triggered, the alarm stays active until it has been acknowledged and the triggering source re-
turns to a non-alarm state. Alarm indicators flash until acknowledged, then stay permanently on until
the alarm is no longer active. Alarm messages are printed on the chart. Continuous jobs remain active
only until the source has returned to a non-alarm state (whether or not the alarm has been acknowl-
edged). NOTE - relay action does not latch when alarm is no longer active.
Trigger
When triggered, any jobs associated with the alarm are initiated, and for continuous jobs (e.g. change
chart speed) continue until the triggering source returns to a non-alarm state. Trigger alarms are not
annunciated.
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