Siemens SITRANS P Bedienungsanleitung PDF herunterladen (Seite 90)

Post-Installation Test UMSITRPDS3-1

November 2010

5-4

5.4.3 Loop Test

This test verifies that a transmitter is operating properly and is capable of transmitting 0% and 100%

analog output signals to a HART Master. The test applies only to transmitters operating in analog mode.

A transmitter configured for digital mode can be tested by setting its address to zero (0).

1. Establish communication; the Online menu displays. First, press 3 Device Setup, then 2

Diagnostics/Service, 2 Simulation/Test, 1 Simulation, and finally 1 Loop Test.

2. A warning appears: “WARN–Loop should be removed from

automatic control.” If the loop status cannot be changed for

operational reasons, press ABORT (F3) to end this

procedure and return to the Online menu. If it is okay to

proceed, go to step 3.

3. Remove the loop from automatic control, then press OK

(F4). When OK is pressed, a list of analog output options is

displayed (at right).

4. Press “1” on the keypad or ENTER (F4) to select the 4 mA

option. The Communicator displays the message “Fld dev

output is fixed at 4.000 mA.” Press OK (F4) to confirm and

proceed with testing or press ABORT (F3) and proceed to

step 8.

5. Read the DMM. The value should be 4 mA.

6. Repeat steps 4 and 5 using the 20 mA output level. The

DMM reading should be 20 mA.

7. For outputs other than 4 or 20 mA, choose option 3, Other,

and enter any desired output value. The DMM reading

should be the entered value in mA.

8. To end the loop override session, press “4” on the keypad or

the ABORT (F3) softkey. The message “Returning fld dev to

original output” appears.

9. When the message “NOTE–Loop may be returned to

automatic control” appears, return the loop to automatic

control, then press OK (F4). This completes verification of

analog output.

IMPORTANT

Failure to exit loop override correctly can cause

the transmitter to remain parked at a fixed

current.

SITRANS P

Choose analog output

level

1 4mA

2 20mA

3 Other

4 End

ABORT|ENTER

Note: If using a Model 375 Field

Communicator, see the inside of

the front cover of this manual.

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