e.g. A Rate Totaliser with a high alarm set at 9000
and an alarm delay of 30 seconds will perform as
follows:
The alarm annunciator will start to flash when an
increasing rate display equals 9000, but the alarm
output will not be activated until the alarm
condition has existed continuously for 30 seconds.
When the alarm output is activated, the alarm
annunciator will stop flashing and become
permanently activated.
If the ‘FL5H’ function, which flashes the Rate
Totaliser display when an alarm occurs, has been
enabled, it will not start to function until the alarm
output is activated.
See section 9.3.11
9.3.10 Alarm silence time: 5iL
This function is primarily intended for use in small
installations where the alarm output directly
operates an alarm annunciator such as a sounder
or beacon. When the alarm silence time, which is
adjustable between 0 and 3600 seconds in 1
second increments, is set to any figure other than
zero, the
P
push-button becomes an alarm accept
button. After an alarm has occurred, operating the
P
button will cause the alarm output to revert to the
non-alarm condition for the programmed alarm
silence time. If the alarm condition still exists at
the end of the silence time, the alarm output will be
reactivated. During the silence time the Rate
Totaliser alarm annunciator will flash until the
silence time expires or the alarm is cleared.
If the ‘FL5H’ function, which flashes the Rate
Totaliser display when an alarm occurs has been
enabled, it will only function when the alarm
output is activated, not during the silence time.
See section 9.3.11
To adjust the alarm silence time select '5iL' from
the alarm configuration menu and press
P
which
will reveal the existing silence time. The flashing
digit of the silence time can be adjusted using the
▲
and
▼
push buttons, and the
P
button to move
control to the other digits. When the required
silence time has been entered press
E
to return to
the alarm menu.
9.3.11 Flash display when alarm occurs
‘FL5H’
In addition to the two alarm annunciators on the
Rate Totaliser display which show the status of
both alarms, this function provides an even more
conspicuous indication that an alarm condition has
occurred.
When enabled, the rate or total display depending
upon which has caused the alarm, alternates
between the numerical value and the alarm
reference, ‘ALr1’ or ‘ALr2’ when the alarm output is
activated. If both alarm outputs are activated by
one variable, the display alternates between the
numerical value and ‘Alr1-2’.
To enable or disable the function select 'FL5H'
from the alarm menu and press
P
which will reveal
the current setting. The function can be changed
by pressing the
▲
or
▼
button followed by the
E
button to return to the alarm menu.
9.3.12 Access setpoint in display mode:
AC5P
This function enables a separate menu providing
access to the alarm setpoints from the display
mode by simultaneously operating the
P
and
▲
push buttons. An operator can therefore adjust the
alarm setpoints without having access to the Rate
Totaliser configuration menu. Protection against
accidental adjustment of the setpoints when the
Rate Totaliser is in the display mode is provided by
a separate security code.
This direct setpoint access menu is enabled and
the separate security code entered from the 'AC5P'
function in the alarm configuration menu as shown
in Fig 14. To change the menu parameters select
'AC5P' from the configuration menu and press
P
which will display the enable prompt 'EnbL'. Press
P
again to reveal if the direct access menu is 'on'
or 'oFF'. The
▲
or
▼
button will toggle the display
between the two conditions.
If 'oFF' is selected, the operator will not have
access to the setpoints from the display mode.
Return to the 'AC5P' prompt in the main menu by
pressing
E
twice.
If 'on' is selected, the operator will have direct
access to the alarm setpoints from the display
mode via a separate optional security code. To
define this four digit security code press
P
to return
to the 'Enbl' prompt followed by the
▲
or
▼
button
to select the access code prompt 'ACCd'.
Pressing
P
will reveal the current security code.
Each digit of the code may be changed by
operating the
▲
and
▼
push buttons, and the
P
button to move control to the next digit. When the
required code has been entered, press
E
twice to
return to the 'AC5P' prompt in the configuration
menu.
Default code 0000 will disable the security code
allowing direct access to the setpoints in the
display mode by pressing the
P
and
▲
buttons
simultaneously. Unless otherwise requested new
instruments with alarms are supplied with this
function disabled and the security code set to
0000.
31
