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2.6.2 Alarm enable: ‘EnbL’
This function allows the alarm output to be
enabled or disabled without altering any other
parameters. To check or change the function
select 'EnbL' from the alarm menu and press
P
which will reveal the current setting. The function
can be changed by pressing the
Up
or
Down
button followed by the
E
button to return to the
alarm menu.
2.6.3 Type of alarm: ‘tYPE’
The ‘tYPE’ function conditions the alarm to
operate from the total or rate display.
To check or change the type of alarm, select
'tYPE' from the alarm menu and press
P
which
will reveal the current setting, ‘tOtAL’ or ‘rAtE’.
The function can be changed by pressing the
Up
or
Down
button followed by the
E
button to return
to the alarm menu.
Note:
When ‘tYPE’ is changed, the alarm
parameters are automatically set to the default
values and the alarm is disabled. It must
therefore be reprogrammed before use.
2.6.4 Setpoint adjustment: ‘SPt1’ or ‘SPr1’
The setpoint, which is displayed in the units and
format selected when the instrument was
programmed, may be positioned anywhere in the
positive instrument display range.
Note:
The setpoints can not be negative.
To adjust the setpoint of alarm 1 select 'SPt1' or
‘SPr1’ from the main menu. SPt1 is displayed
when a total alarm has been selected and SPr1
when a rate alarm has been selected. Pressing
P
will reveal the existing setpoint value with one
digit flashing. Each digit may be adjusted using
the
Up
and
Down
push-buttons and the
P
button
will transfer control to the next digit. When set as
required, pressing
E
will return the display to the
alarm menu.
2.6.5 Alarm function: ‘HI.LO’
Each alarm may be conditioned as a high or low
alarm. To check or change the alarm function
select 'HI.LO' from the alarm menu and press
P
to reveal the current setting. The function can be
changed by pressing the
Up
or
Down
buttons
followed by the
E
button to return to the alarm
menu.
2.6.6 Alarm output status: ‘no.nc’
The alarm output may be open or closed in the
non-alarm condition. When the BA364D power
supply is turned off or disconnected, both the
alarm outputs will open irrespective of whether
normally open or normally closed outputs have
been selected. Therefore an open output should
be the alarm condition for fail-safe operation.
To check the alarm output status select 'no.nc'
from the alarm menu and press
P
to reveal the
current setting. The function can be changed by
pressing the
Up
or
Down
button followed by the
E
button to return to the alarm menu.
2.6.7 Hysteresis: ‘HStr’
Hysteresis is only available when the alarm has
been conditioned as a rate alarm. During
programming, hysteresis is shown in the units
that the instrument has been calibrated to
display.
To adjust the hysteresis, select 'HStr' from the
alarm menu and press
P
to reveal the existing
figure. Each digit can be adjusted using the
Up
and
Down
push-buttons. The
P
button transfers
control to the next digit. When the required
hysteresis has been entered, press
E
to return to
the alarm menu.
e.g. When calibrated to display frequency with a
high alarm at 100Hz and hysteresis of 5Hz, the
alarm will perform as follows:
High alarm will be activated when frequency
(rate) equals or exceeds 100Hz, but will not
reset until the frequency falls below 95Hz.
2.6.8 Alarm delay: ‘dELA’
The alarm output may be delayed for a fixed time
following the alarm condition occurring. The
delay can be programmed in 1 second
increments up to 3600 seconds. If a delay is not
required zero should be entered. To adjust the
delay select 'dELA' from the alarm menu and
press
P
which will reveal the existing delay time.
Each digit of the delay can be adjusted using the
Up
and
Down
push-buttons, and the
P
button to
move to the next digit. When the required delay
has been entered, press
E
to return to the alarm
menu.
The front panel alarm annunciator will start
flashing immediately an alarm occurs and
continue for the delay time after which the alarm
output will be activated.
2.6.9 Alarm silence time: ‘SIL’
This is primarily intended for use in small
installations where the alarm output directly
operates an annunciator such as a sounder.
When the alarm silence time is set to any figure
other than zero, the
P
push-button becomes an
alarm accept button.
