Annex A
Page A - 12
HA243820
Issue 5 Mar 98
MODEL 346 INSTALLATION AND OPERATION MANUAL
A5.0 ALARM CONFIGURATION
DISPLAY
SCROLLABLE VALUES
DESCRIPTION OF PARAMETER OR FUNCTION
Alarm channel
1, 2, 3, 4, 5, 6, 7, 8, 9
The up and down arrow keys are used to select the channel for which
the alarm is to be configured. Operation of the Enter key confirms.
Alarm number
1, 2, 3, 4
The up and down arrow keys are used to select which of the four alarms
associated with the chosen channel is to be configured. Operation of
the Enter key confirms.
Alarm type
Off, High, Low, Deadband
The up and down arrows are used to scroll through the available types
Rate-Rising, Rate-Falling
of alarm . See section 4.10 of this manual for further details. If OFF is
selected, no further configuration is possible for the alarm; operation
of the Clear key causes a return to the 'Alarm Number' display, where
further alarms for the selected channel can be configured.
Setpoint
None
The up, down and side arrow keys are used to enter the setpoint for
the alarm, in channel display units.
Hysteresis
None
The up, down and side arrow keys are used to enter the hysteresis for
the alarm in channel display units.
Deadband
None
This display appears only if the selected alarm type is 'Deadband'. The
up, down and side arrow keys are used to enter the deadband value
for the alarm, in channel display units. Note that the value set here is
set both above and below the setpoint previously entered. For exam-
ple, a setpoint of 50 units with a deadband of 10 units will have a total
deadband with of 20 units, stretching from 40 to 60 units.
Alrm Print
On, Off
Allows printing of the alarm on and off messages (see below) to be
enabled (selected ON), or disabled (selected OFF).
Rate Base
/sec, /min, /hour
This display appears only if the selected alarm type is 'Rate-Rising', or
'Rate-Falling'. The up and down arrow keys are used to select a base
time over which the rate-of-change setpoint value is to be measured.
Message
Text entry
The up, down and side arrow keys are used to enter message string
to be printed whenever the alarm becomes active and whenever it
becomes inactive. The enabling of the printing of this message is de-
scribed in 'Alrm Print' above.
Table A5.0 Alarm configuration parameters