6. Test the Frequency Input.
a) Set the remote input device to generate a known fixed current.
b) Choose
Device Tools
>
Diagnostics
>
Testing
>
Read Frequency Input
.
c) Return the remote input device to normal operation.
Postrequisites
•
If the mA Output readings are within 20 microamps of the expected values, you can correct this
discrepancy by trimming the output.
•
If the discrepancy between the mA Output readings is greater than 20 microamps, or if at any step the
reading was faulty, verify the wiring between the transmitter and the remote device, and try again.
•
If the mA Input reading was slightly off at the transmitter, calibrate the mA signal at the remote input
device.
•
If the Frequency Input reading was slightly off at the transmitter, calibrate the frequency signal at the
remote input device.
•
If the Discrete Input readings are reversed, check the setting of
Discrete Input Polarity
.
17.27.3 Perform loop tests using the Field Communicator
Restriction
You cannot use the Field Communicator to perform loop tests on the mA Input or the Frequency Input. If you
are using those input types, you must use another method to perform the loop tests.
Procedure
1. Test the mA Output(s).
a) Choose
Service Tools
>
Simulate
>
Simulate Outputs
and select the mA output to test.
•
Channel A = mA Output 1
•
Channel B = mA Output 2
•
Channel C = mA Output 3
b) Select
4 mA
.
c) Read the mA current at the receiving device and compare it to the transmitter output.
The readings do not need to match exactly. If the values are slightly different, you can correct
the discrepancy by trimming the output.
d) Press
OK
.
e) Select
20 mA
.
f) Read the mA current at the receiving device and compare it to the transmitter output.
The readings do not need to match exactly. If the values are slightly different, you can correct
the discrepancy by trimming the output.
g) Press
OK
.
Configuration and Use Manual
Troubleshooting
MMI-20025166
March 2019
Configuration and Use Manual
295
