Emerson Rosemount 2051, Справочное руководство, Страница: 37 / 228

27
Reference Manual
00809-0100-4107, Rev BA
Section 2: Configure
April 2013
Configuration
2.9 Performing transmitter tests
2.9.1 Verifying alarm level
If the transmitter electronics board, sensor module, or LCD/LOI Display is repaired or replaced,
verify the transmitter alarm level before returning the transmitter to service. This is useful in
testing the reaction of the control system to a transmitter in an alarm state. Thus ensuring the
control system recognizes the alarm when activated. To verify the transmitter alarm values,
perform a loop test and set the transmitter output to the alarm value (see
Table 2-4 , 2-5 , and
2-6 on page 21 , and “Verifying alarm level” on page 27 ).
Note
Before returning transmitter to service, verify security switch is set to the correct position. Refer
to
“Verify configuration” on page 12 .
2.9.2 Performing an Analog Loop Test
The Analog Loop Test command verifies the output of the transmitter, the integrity of the loop,
and the operations of any recorders or similar devices installed in the loop. It is recommended
that the 4-20 mA (1-5 Vdc) points in addition to alarm levels when installing, repairing, or
replacing a transmitter.
The host system may provide a current measurement for the 4-20 mA (1-5 Vdc) HART output. If
not, connect a reference meter to the transmitter by either connecting the meter to the test
terminals on the terminal block, or shunting transmitter power through the meter at some
point in the loop. For 1-5V output, voltage measurement is directly measured from Vout to (-)
terminals.
Performing a Analog Loop Test test using a Field Communicator
Performing a Analog Loop Test test using AMS Device Manager
Right click on the device and, within the Methods drop down menu, move cursor over
Diagnostics and Test . In the Diagnostics and Test drop down menu select Loop Test .
1. Click Next after setting the control loop to manual.
2. Follow Screen prompts to perform a Loop Test.
3. Select Finish to acknowledge the method is complete.
Performing analog loop test using a Local Operator Interface
To perform an analog loop test using the LOI, the 4mA (1 V), 20mA (5V), and custom mA point
may be set manually. Reference
Figure 2-17 for instructions on how to perform a transmitter
loop test using an LOI.
From the HOME screen, enter the fast key sequence
Device Dashboard Fast Keys
3, 5, 1