BEKA BA337E, Руководство пользователя

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10.4.8 Alarm output status:
no . nC
Each single pole alarm output may be open or closed
in the non-alarm condition.
When the BA337E or
BA338E power supply is turned off or disconnected,
the alarm output(s) will open irrespective of whether
normally open or normally closed outputs have been
selected. Therefore when designing an alarm system
normally closed
nc
should be selected so that the
output opens when an alarm occurs or if the power
supply fails.
Using the
&
or
*
push button select
no . nC
from the
selected alarm sub-menu and press
(
to check or
change the function. The
&
or
*
push button will
toggle the contact status between
no
and
nC
, when
set as required, press the
)
button to return to the
no,nC
prompt in the alarm sub-menu.
10.4.9 Hysteresis:
H5tr
Hysteresis is only available on rate alarms so the
H5tr
function only appears in the configuration sub-
menu when alarm
tYPE
has been set to
rAtE
. During
configuration hysteresis is shown in the units of rate
previously configured for the rate display.
Using the
&
or
*
push button select
H5tr
in the
selected alarm sub-menu and press
(
which will
reveal the existing hysteresis with one digit flashing.
The required hysteresis can be entered using the
&
or
*
push button to adjust the flashing digit and the
(
button to transfer control to the next digit. When
set as required press
)
to enter the value and return
to the
H5tr
prompt in the alarm sub-menu.
e.g. A Rate Totaliser configured to display a flow of 0
to 5000, with a high alarm set at 4000 and hysteresis
of 100 will perform as follows:
High alarm will be activated when flow
equals or exceeds 4000, but will not reset
until the flow falls below 3900.
10.4.10 Alarm delay:
dELA
This function enables activation of the alarm output to
be delayed for a fixed time following the alarm
condition occurring. The delay can be set in 1 second
increments up to 3600 seconds. If a delay is not
required zero should be entered.
To adjust the delay select
dELA
using the
&
or
*
push button in the selected alarm sub-menu and
press
(
which will reveal the existing delay time in
seconds with one digit flashing. The required delay
time can be entered using the
&
or
*
push button
to adjust the flashing digit and the
(
button to
transfer control to the next digit. When set as
required press
)
to enter the value and return to the
dELA
prompt in the alarm sub-menu.
The Rate Totaliser's alarm annunciator will start
flashing immediately an alarm condition occurs and
will continue for the delay time, after which the alarm
output will be activated and the alarm annunciator
will be permanently activated.
10.4.11 Alarm silence time:
5IL
The alarm silence function 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
(
push button becomes an
alarm accept button.
After an alarm has occurred, operating the
(
button will cause the alarm output to revert to the
non-alarm condition for the programmed alarm
silence time.
When an alarm is silenced by
operating the
(
push button, the Rate Totaliser's
alarm annunciator will flash until the silence time
expires.
To adjust the alarm silence time select
5iL
using the
&
or
*
push button in the selected alarm sub-
menu and press
(
which will reveal the existing
alarm silence time in seconds with one digit flashing.
The required silence time can be entered using the
&
or
*
push button to adjust the flashing digit and
the
(
button to transfer control to the next digit.
When set as required press
)
to enter the value
and return to the
5iL
prompt in the alarm sub-menu.
10.4.12 Flash display when alarm occurs:
FL5H
In addition to the two alarm annunciators on the left
hand side of 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, this function alternates the rate or
total display between the numerical value and the
alarm identification
AL1
or
AL2
when an alarm
occurs.
Using the
&
or
*
push button select
FL5H
from
the selected alarm sub-menu and press
(
to check
or change the function. The
&
or
*
push button
will toggle the function between
oFF
and
on
, when
set as required, press the
)
button to return to the
FL5H
prompt in the alarm sub-menu.
10.4.13 Access Setpoint:
AC5P
This function activates a separate menu that
provides direct access to the alarm setpoints from
the totalisation mode by simultaneously operating
the
(
and
*
buttons. An operator can therefore
adjust the alarm setpoints without having access to
the configuration and alarm sub-menus. Protection
against unauthorised or accidental adjustment is
provided by a separate security access code.
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