Dynamic SFC3, Operator'S Manual

Page: 19 / 141

Dynamic Fluid Measurement SFC3 Liquid Pulse Manual Quick Start
— 1-14
Date: 8/1/2019
INPUT/OUTPUT: Assignment, Ranging, Wiring, and Calibration
Input/Output Assignment
We will now configure your Smart Flow Computer’s inputs and outputs. The flow computer allows the
user to configure the inputs and outputs. i.e. Analog #1 is pressure for Meter #1. Unassigned inputs are not
used by the flow computer.
How to assign a transmitter to an I/O point:
Before beginning the procedure of assigning inputs and outputs, it is advisable to set up the meter (
Meter
|
Set Up
). This is because certain parameters on the
Transducer Input Assignment
page
change (or may not appear, etc.) based on
Meter
|
Set Up
.
1 Use your arrow keys to scroll to menu item
I/O
(between
Meter
and
Report
). Its first
entry is
Transducer Input Assignment
. Press < ENTER> .
2. Use the down/up arrow key to scroll through this menu. The first four parameters are used to
set the number of decimals you would like to see in your live inputs (these numbers do not
affect the precision of your calculated data). Spare inputs are inputs that the flow computer
will read and display in the diagnostic data but are not used in the calculations. Spare inputs
high and low limit alarms are documented in the historical alarm report.
3. After the parameters used for setting the number of decimals come a series of parameters
ending with the words
Assignment (1-n) . Assignments 1-4 are analog
inputs attached to terminal P3 of the back panel. These
inputs accept
4-20mA or 1-5 volts input and are suitable for temperature, pressure,
density, BS&W, or spare inputs. Assignments 5 and 6 are strictly RTD (temperature) inputs
only for the meter, prover, densitometer or spare; temperatures are inputted via terminal P5
on the back panel. Assignment 7 indicates a density frequency input; it is assigned
automatically once you choose live density frequency input in the setup menu at density type
selection (and it can
only be assigned via
Meter
|
Set Up
|
Density #
n , where n = 1 to
4). Assignment 10 (module 1) and assignment 11 (module 2) are used for Rosemount multi-
variable module only. DP, pressure, and temperature for the meter can be assigned.
Ranging the Transmitter Inputs:
1. Enter the range values : after assigning the inputs scroll down the transducer inputs
assignment menu to scale the 4-20mA. Enter the value at
…@4mA
and
…@20mA
. Enter both
values similar to the way the transmitter is ranged. 1-5 volts is equivalent to 4-20mA. Enter
the 1 volt value at the 4mA, and 5 volt value at 20mA.
2. Enter the high and low limits : high limits and low limits are simply the alarm points in
which you would like the flow computer to flag as an alarm condition. Enter these values
with respect to the upper and lower range conditions. Try to avoid creating alarm log when
conditions are normal. For example: If the line condition for the pressure is between 0 to 500
PSIG. then you should program less than zero for low pressure alarm, and 500 or more for
high pressure alarm. High and low limits are also used in the scale for the Modbus variables.
3. Set up the fail code:
Maintenance
and
Failure Code
values tell the flow computer
to use a default value in the event the transmitter fails. The default value is stored in
Maintenance
. There are three outcomes: the transmitter value is always used, no matter
what (
Failure Code
= 0); the
Maintenance
value is always used, no matter what
(
Failure Code
= 1); and the
Maintenance
value is used only when the transmitter’s
value indicates that the transmitter has temporarily failed (
Failure Code
= 2).