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Procedure
1. Choose Service Tools > Maintenance > Routine Maintenance > Trim mA Output 1.
2. Follow the instructions in the guided method.
Important
The HART signal over the primary mA output affects the mA reading. Disconnect the wiring
between the Field Communicator and the transmitter terminals when reading the primary
mA output at the receiving device. Reconnect to continue the trim.
3. Check the trim results. If any trim result is less than −200 microamps or greater than
+200 microamps, contact Micro Motion customer service.
10.17 Check HART communications
If you cannot establish or maintain HART communications, or if the primary mA output is
producing a fixed value, you may have a wiring problem or a HART configuration problem.
Prerequisites
You may need one or more of the following:
• The installation manual for your meter
• A Field Communicator
• A voltmeter
• Optional: The HART Application Guide, available at www.hartcomm.org
Procedure
1. Verify the HART address.
Tip
The default HART address is 0. This is the recommended value unless the device is in a
multidrop network.
2. If the primary mA output is producing a fixed value of 4 mA, ensure that mA Output
Action (Loop Current Mode) is enabled.
For all HART addresses except 0, mA Output Action must be enabled to allow the
primary mA output to report process data.
3. Refer to the wiring diagrams in the installation manual and verify that the primary
mA output is correctly wired for HART support.
4. Ensure that the output is powered.
5. Check for electrical problems at the transmitter terminals.
a. Disconnect the primary mA output wires from the transmitter's MAO1 terminals.
b. Wire and power the MAO1 terminals as shown in the following figure.
Troubleshooting
Configuration and Use Manual 181