146 Micro Motion Series 1000 and Series 2000 Transmitters
Troubleshooting
12.14.5 Checking the HART communication loop
To check the HART communication loop:
1. Verify that the loop wires are connected as shown in the wiring diagrams in the transmitter
installation manual.
2. Remove analog loop wiring.
3. Install a 250 Ω resistor across the primary mA output terminals.
4. Check for voltage drop across the resistor (4–20 mA = 1–5 VDC). If voltage drop < 1 VDC,
add resistance to achieve voltage drop > 1 VDC.
5. Connect the Communicator directly across the resistor and attempt to communicate (poll).
If your HART network is more complex than the wiring diagrams in the transmitter installation
manual, either:
• Contact Micro Motion. See Section 12.3.
• Contact the HART Communication Foundation or refer to the HART Application Guide,
available from the HART Communication Foundation on the Internet at www.hartcomm.org.
12.15 Checking the communication device
Ensure that your communication device is compatible with your transmitter.
Communicator
The 275 HART Communicator or 375 Field Communicator is required, and must contain the
appropriate device description. Some of the newest functionality (e.g., meter verification) is not yet
supported by the Communicator.
Note: For the Model 2500 transmitter, the 275 HART Communicator uses the device description for
the Model 2700 transmitter with configurable input/outputs. See Chapter 4 for more information.
Note: The 268 SMART FAMILY Interface is not compatible with Series 1000/2000 transmitters.
To check the device descriptions:
1. Turn on the Communicator, but do not connect it to the transmitter.
2. When the words
No device found appear, press OK.
3. Select
OFFLINE.
4. Select
New Configuration.
5. Select
Micro Motion.
6. Ensure that the correct device description for your transmitter is listed. If the correct device
description is not found, a Generic Device menu is displayed.
• Model 1500/2500 transmitters: You must obtain a 375 Field Communicator. Contact
Micro Motion customer support.
• Model 1700/2700 transmitters: The 275 HART Communicator must be upgraded. Contact
Micro Motion customer support.
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