Instruction Manual
IM-106-880, Rev 1.0
January 2007
OCX 8800
4-8
D/A TRIM PROCEDURES
O
2
D/A trim procedure using the LOI
Use the following procedure to perform the O
2
D/A trim procedure at the LOI.
Refer to the LOI menu tree in Figure 4-4.
1. From the operating display use the left-pointing key to select the first
column submenu. Use the down-pointing key to select
SYSTEM
.
2. From the
SYSTEM
menu, use the down-pointing key to select
Input/Output
. Use the right-pointing key to select the
Analog
parameters list.
3. Scroll down to the item
Trim O2 Out
. Touch the right-pointing key to
start the O
2
trim procedure.
NOTE
If you wish to exit D/A Trim with no changes, step through the procedure using
y
es responses, and enter no meter readings.
4. Remove the electronics housing cover.
5. Refer to Figure 2-4. Connect a digital multimeter to read the milliamp
output from the O
2
D/A converter circuit. Connect the positive lead to
the AOUT1+ terminal and connect the negative lead to the AOUT1-
terminal. Then, touch the
Enter
key at the LOI.
6. The LOI displays
4 mA........Meter
. The trim program inputs the
design-equivalent signal for a 4.00 mA output. Read the O
2
millamp
output at the digital multimeter. Use the right-pointing key to select each
digit and use the up- and down-pointing keys to change the value. When
the correct value is displayed, use the
Enter
key to input the value.
7. The LOI displays
20 mA........Meter
. The trim program inputs the
design-equivalent signal for a 20.00 mA output. Read the O
2
millamp
output at the digital multimeter. Use the right-pointing key to select each
digit and use the up- and down-pointing keys to change the value. When
the correct value is displayed, use the
Enter
key to input the value.
8. The LOI displays a
Meter at 4 mA
prompt. Use the right-pointing key to
select the letter
y
es or
n
o. Use the up- or down-pointing key to change
the letter. Then use the
Enter
key to input the reponse. If
n
o, the
process repeats from step 7.
9. The LOI displays a
Meter at 20 mA
prompt. Use the right-pointing key
to select the letter
y
es or
n
o. Use the up- or down-pointing key to
change the letter. Then use the
Enter
key to input the reponse. If
n
o, the
process repeats from step 8.
10. When the reponses in steps 9 and 10 are
y
es, the trim procedure is
complete. Exit the LOI menu and return the control loop to automatic
control.
To avoid a potentially dangerous operating condition, the OCX 8800 must be removed from
the automatic combustion control loop before you start the D/A trim procedure.
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