2-17
Installation
COMMISSIONING THE
TRANSMITTER FOR USE
WITH THE HART TRI-LOOP
To prepare the Model 3244MV transmitter for use with a Model 333
HART Tri-Loop, you must configure the transmitter to Burst Mode and
set the process variable output order. In Burst Mode, the transmitter
provides digital information for the analog current in mA to the HART
Tri-Loop. The HART Tri-Loop divides the signal into separate 4–20 mA
loops for the primary (PV), secondary (SV), tertiary (TV), and
quaternary (QV) variables. When using the Model 3244MV transmitter
in conjunction with the HART Tri-Loop, you must also consider the
configuration of the differential temperature and Hot Backup features,
if used.
NOTE
These procedures assume that the sensors and the transmitter are
connected, powered, and functioning properly, and that a Model 275
HART Communicator is connected to the transmitter control loop and
is communicating successfully. For communicator usage instructions,
see Appendix B: Model 275 HART Communicator.
Set the Transmitter to Burst
Mode
To set the transmitter to burst mode, follow the steps below.
1. From the Home screen, select
1 Device setup
,
4 Detailed setup
,
3 Output condition
,
2 HART output
,
4 Burst option
to prepare to
set the transmitter to burst command 3. The communicator
displays the Burst option screen.
2. Select
Process vars/crnt
. The communicator returns to the HART
output screen.
3. Select
3 Burst mode
to prepare to enable Burst Mode. The
communicator displays the Burst Mode screen.
4. Select
On
to enable Burst Mode. The communicator returns to
the HART output screen.
5. Select
Send
to download the new configuration information to
the transmitter.
Set Process Variable Output
Order
To set the process variable output order, follow the steps below.
1. From the Home screen, select
1 Device setup
,
1 Process variables
,
7 Variable re-map
. Select
OK
to set the control loop to manual.
The communicator displays the Primary Variable screen.
2. Select the item you wish to set as the primary variable at the
Select PV
prompt.
3. Repeat step 2 for the SV, TV, and QV. The communicator displays
the Variable mapping screen.
4. Select
OK
to accept the order to which the variables are mapped,
or
Abort
to abort the entire procedure.
NOTE
Take careful note of the process variable output order. You must
configure the HART Tri-Loop to read the variables in the same order.
5. Select
OK
to return the control loop to automatic control.
