The LOI displays a 20 mA...Meter. The trim program inputs the design-
equivalent signal for a 20.00 mA output.
7. Read the O
2
milliamp output at the digital multimeter. Press Right to select
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.
8. Press Right to select yes or no. Press Up and Down to change the selection.
Then press Enter to input the response. If no, the process repeats from
Step 7.
The LOI displays a Meter at 20 mA prompt.
9. Press Right to select yes or no. Press Up and Down to change the selection.
Then press Enter to input the response. If no, the process repeats from
Step 8.
When the responses in Step 8 and Step 9 are yes, the trim procedure is complete.
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 Figure 4-4.
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.
Press Down to select SYSTEM.
2. From the SYSTEM menu, press Down to select Input/Output. Press Right to
select the Analog parameters list.
3. Scroll down to the item, Trim COe Out. Press Right to start the COe trim
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.
4. Remove the electronics housing cover.
5. Connect a digital multimeter to read the milliamp output from the COe D/A
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 2-5, and Figure 2-6.
Manual Using the local operator interface (LOI)
00809-0500-4880 December 2022
Rosemount OCX8800A 79
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