BEKA BA317NE, Manual

Page: 31 / 40

9.4.9 Hysteresis:
H5tr
Hysteresis is only available on speed alarms so the
H5tr
function only appears in the configuration sub-
menu when alarm
tYPE
has been set to
5PEEd
. During
configuration hysteresis is shown in the units of
5PEED
previously configured for the Tachometer 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 Tachometer configured to display a rotational
speed of 0 to 500 RPM, with a high alarm set at 400
RPM and hysteresis of 10 RPM will perform as
follows:
The high alarm will be activated when speed
equals or exceeds 400 RPM, but will not reset
until the speed falls below 390 RPM.
9.4.10 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 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.
9.4.11 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 configured alarm silence time. When
an alarm is silenced the 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 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
5iL
prompt in the alarm sub-menu.
9.4.12 Flash display when alarm occurs:
FL5H
In addition to the two alarm annunciators at the
bottom left hand side of the Tachometer 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 speed or
run-time 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.
9.4.13 Access Setpoint:
AC5P
This function activates a separate menu that
provides direct access to the alarm setpoints when
the Tachometer is in the display 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.
Using the
&
or
*
push button select
AC5P
from the
configuration menu and press
(
to reach the
enable function
EnbL
. Pressing
(
will reveal the
existing setting which can be toggled between
on
and
oFF
by pressing the
&
or
*
push button.
When set as required, press the
)
button to return
to the
EnbL
prompt from which a separate security
access code can be entered using the
ACCd
function
which can be selected using the
&
or
*
push
button.
To enter a new security code select
ACCd
from the
sub-menu and press
(
which will cause the
Tachometer to display
0000
with one digit flashing.
The flashing digit may be adjusted using the
&
and
*
push button, when set as required
operating the
(
button will transfer control to the
next digit. When all the digits have been adjusted
press
)
to return to the
ACCd
prompt.
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