50
11.4.3 Access 4/20mA output sub-menu:
4-20 oP
Access the Rate Totaliser's configuration menu as
described in section 6.2. Using the
&
or
*
push
buttons scroll though the menu until
4-20 oP
is
displayed, pressing
(
will then access the 4/20mA
output sub-menu which is shown in Fig 19.
11.3.4 4/20mA enable:
EnbL
This function allows the 4/20mA output to be
enabled or disabled without altering the calibration.
Using the
&
or
*
push button select
4-20 oP
from
the configuration menu and press
(
to reach
EnbL
in the 4/20mA sub-menu. Pressing
(
will then
reveal the existing setting. The function can be
changed by pressing the
&
or
*
push button
followed by the
)
button to return to the 4/20mA
output sub-menu.
11.4.5 Select rate or total source:
4-20tYPE
The 4/20mA output current can represent the Rate
Totaliser's rate or total display, this should be defined
before any other current output functions are
adjusted.
Using the
&
or
*
push button select
4-20tYPE
in
the
4-20 op
output sub-menu and press
(
to reveal
the existing setting
totAL
or
rAtE
. The function can
be changed by pressing the
&
or
*
push button
followed by the
)
button to return to the
4-20tYPE
prompt in the sub-menu.
11.4.6 Display which corresponds to 4mA
output:
4 . 000
The Rate Totaliser display which corresponds to a
4.000mA output current is defined by this function.
Using the
&
or
*
push button select
4.000
in the
4/20mA output sub-menu and press
(
which will
reveal the existing rate or total display with one digit
flashing. The required display 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
4 . 000
prompt in the 4/20mA
output sub-menu.
11.4.7 Display which corresponds to 20mA
output:
20 . 000
The Rate Totaliser display which corresponds to a
20.000mA output current is defined by this function.
Using the
&
or
*
push button select
20 . 000
in the
4/20mA output sub-menu and press
(
which will
reveal the existing rate or total display with one digit
flashing. The required display 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
20 . 000
prompt in the 4/20mA
output sub-menu
4-20 op
.
Notes:
1.
If the calibration of the rate or total display
defined as the source for the 4/20mA output
is changed, the 4/20mA output will
automatically be set to give a constant 3.5mA
output irrespective of the display. The
4/20mA output should always be reconfigured
following reconfiguration of the source
display.
2.
If the Rate Totaliser and the 4/20mA current
sink output are powered from separate
supplies, the 4/20mA output current will
continue to flow when the Rate Totaliser
supply fails or is turned off. Powering both
from a common supply eliminates this effect.