Panametrics Aurora H2O, Руководство пользователя

Страница: 60 / 170

Aurora H2O User’s Manual 13
Chapter 3. Operation and General Programming
3.5.7 Testing the Output
The Test Menu causes the Aurora H2O to generate a 0- or 4-20mA output at the
percent of scale selected. For example, in 4-20 operation, 0% = 4mA, 50% = 12mA, 100%
= 20mA. This allows the proper function of recording or SCADA equipment to be
verified. In 0-20 operation, 0% = 0mA, 50% = 10mA, 100% = 20mA.
To test system output, from the Output Menu select Test and press Enter . The Aurora H2O
will proceed to check the settings, and a screen similar to this display will appear.
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, and return to the
Output Menu
.
Check your output wiring. If the reading on your SCADA or DCS is off slightly, then
you may use the
Trim
feature to trim the output zero or span.
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.
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:
HiRng Over Range errors are inhibited; NAMUR signaling will NOT occur for Over Range error conditions.
NAMUR signaling will occur for all other errors in the table above.
Lo+Hi Under Range AND Over Range errors are inhibited; NAMUR signaling will NOT occur for these error
conditions. NAMUR signaling will occur for all other errors in the table above.
ALL ALL errors are inhibited; NAMUR signaling will NOT occur for any error in the table above.
Output Menu [Out
A]
Select
Lower
Units NAMUR
Output Menu [Out
A]
Select
Lower
Units NAMUR