Emerson Rosemount OCX8800A Manual page 79

Manual
00809-0500-4880
7. Read the O
8. Press Right to select yes or no. Press Up and Down to change the selection.
9. Press Right to select yes or no. Press Up and Down to change the selection.
When the responses in
Postrequisites
Exit the LOI menu and return the control loop to automatic control.
4.4.2 COe D/A trim using the local operator interface
(LOI)
Refer to the LOI menu tree in
WARNING
To avoid a potentially dangerous operating condition, remove the transmitter
from the automatic combustion control loop before you start the D/A trim
procedure.
Procedure
1. From the operating display, press Left to select the first column submenu.
2. From the SYSTEM menu, press Down to select Input/Output. Press Right to
3. Scroll down to the item, Trim COe Out. Press Right to start the COe trim
4. Remove the electronics housing cover.
5. Connect a digital multimeter to read the milliamp output from the COe D/A
Rosemount OCX8800A
The LOI displays a 20 mA...Meter. The trim program inputs the design-
equivalent signal for a 20.00 mA output.
milliamp output at the digital multimeter. Press Right to select
2
each digit and press Up and Down to change the value. When the correct
value is displayed, press Enter to input the value.
The LOI displays a Meter at 4 mA prompt.
Then press Enter to input the response. If no, the process repeats from
Step 7.
The LOI displays a Meter at 20 mA prompt.
Then press Enter to input the response. If no, the process repeats from
Step 8.
Step 8
Press Down to select SYSTEM.
select the Analog parameters list.
procedure.
Note
If you wish to exit D/A trim with no changes, step through the procedure
using yes responses and enter no meter readings.
converter circuit. Connect the positive lead to the AOUT2+ terminal and
connect the negative lead to the AOUT2- terminal. Then press Enter on the
LOI.
Refer to Figure 2-4, Figure
Using the local operator interface (LOI)
and Step 9 are yes, the trim procedure is complete.
Figure 4-4.
2-5, and Figure 2-6.
December 2022
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