Chapter 6 Troubleshooting; Overview; Safety Messages; Troubleshooting For 4-20 Ma Output - Emerson Rosemount 3051 Manual

Manual
00809-0100-4007
6 Troubleshooting
6.1

Overview

This section provides summarized troubleshooting suggestions for the most common
operating problems.
If you suspect malfunction despite the absence of any diagnostic messages on the Field
Communicator display, consider using
problem.
6.2

Safety messages

Procedures and instructions in this section may require special precautions to ensure the
safety of personnel performing the operations.
See Safety
6.3

Troubleshooting for 4-20 mA output

6.3.1 Transmitter milliamp reading is zero
Recommended actions
6.3.2 Transmitter not communicating with communication
device
Recommended actions
Emerson.com/Rosemount
messages.
1. Verify terminal voltage is 10.5 to 42.4 Vdc at signal terminals.
2. Check power wires for reversed polarity.
3. Check that power wires are connected to signal terminals.
4. Check for open diode across test terminal.
1. Verify terminal voltage is 10.5 to 42.2 Vdc.
2. Check loop resistance, 250 Ω minimum ([PS voltage - terminal voltage]/loop
current).
3. Check that power wires are connected to signal terminals and not test
terminals.
4. Verify clean DC power to transmitter (maximum AC noise 0.2 volts peak to
peak).
5. Verify the output is between 4 and 20 mA or saturation levels.
6. Use the communication device to poll for all addresses.
Diagnostic messages to identify any potential
Troubleshooting
March 2023
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