Baker Hughes Panametrics Aurora H2O, Руководство пользователя

Страница: 42 / 92

3.5.8 Trimming the outputs
The trim menu enables the operator to compensate for differences in measurement of the 0/4-20 mA outputs by connected
recorders or SCADA equipment. To trim the output:
Select trim from the output
menu and press enter. The
following screen appears.
NOTE: The trim applies to whichever output is chosen with
the select menu item, and displayed on the menu title bar.
Use the left and right arrow
keys to select an output
(A, B or C) and press enter.
The screen returns to the
previous display.
When performing a trim
operation, the Aurora H2O
unit requires you to first
reset the trim. To reset the
trim output, highlight reset
trim and press enter. The
following screen appears.
Use the left or right arrow
keys to highlight yes and
press enter. This cancels
any previous trim values,
and returns the Aurora H2O
to its factory adjustment.
The display returns to the
previous screen with trim
zero highlighted.
To trim the zero value,
press enter. A screen
similar to the following
appears.
This will cause the
Aurora
H2O to output 4.000
mA on the output being
trimmed. The output value
should then be read using
the connected recorder,
SCADA equipment, or DVM.
enter the value read from
the connected equipment
as the zero trim value, as
follows:
NOTE: Since you cannot trim 0 mA for negative offsets, trim
for the lower end of the scale is at the 4 mA output level.
Use the left and right
arrow keys to select each
digit to be changed,
and the up and down
arrow keys to increase or
decrease its value. Press
enter to save (or cancel to
keep the previous value).
The trim menu returns with
trim span highlighted. To
change the span value,
press enter. A screen
similar to the following
appears.
This will cause the
Aurora
H2O to output 20.000
mA on the output being
trimmed. The output value
should then be read using
the connected recorder,
SCADA equipment, or DVM.
Enter the value read from
the connected equipment
as the span trim value.
Use the left and right
arrow keys to select each
digit to be changed,
and the up and down
arrow keys to increase or
decrease its value. Press
enter to save (or cancel to
keep the previous value).
Trimming is complete.
Accuracy can be verified
using the test menu,
above.
Example: Trim is reset, then trim zero is selected. The SCADA
input reports 3.977 mA.
The operator enters 3.977” as the zero trim value.
Trim span is selected. The SCADA input reports 19.985 mA.
The operator enters “19.985” as the span trim value.
Aurora H2O adjusts the output accordingly to true the
output as read by the customer recorder, SCADA or DVM.
Using the test menu, the operator verifies that a test value of
0% now reads 4.000 mA at the SCADA equipment, and a test
value of 100% now reads 20.000 mA.
32