Fig 20 4/20mA output configuration sub-menu
10.6.4 4/20mA output:
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 20.
10.6.5 Enable 4/20mA output:
Enbl
This function allows the 4/20mA current output to be
disabled or enabled without altering the calibration.
Using the
&
or
*
push button select
EnbL
in the
4-20 op
sub-menu and press
(
to reveal the existing
setting
on
or
oFF
. The function can be changed by
pressing the
&
or
*
push button followed by the
)
button to return to
EnbL
prompt in the sub-menu.
10.6.6 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 4/20mA 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.
10.6.7 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.
10.6.8 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.
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.
47
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