Check Hart Address And Ma Output Action - Emerson Micro Motion 1500 Configuration And Use Manual

Troubleshooting
Prerequisites
You will need:
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Procedure
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10.14

Check HART Address and mA Output Action

If the transmitter is producing a fixed current from the mA Output, the mA Output Action
parameter may be set incorrectly.
When the mA Output Action parameter is set to Fixed, the mA Output produces a fixed
value, and does not report process data or implement its fault action.
When HART Address is changed, some configuration tools will automatically change mA
Output Action.
Tip
Always verify mA Output Action after setting or changing HART Address.
Procedure
1.
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A copy of your transmitter installation manual
A 250–600 Ω resistor
A Field Communicator
Optional: the HART Application Guide, available at
Verify that the loop wires are connected as shown in the wiring diagrams in the
transmitter installation manual.
If your HART network is more complex than the wiring diagrams in the transmitter
installation manual, contact either customer service or the HART Communication
Foundation.
Disconnect the primary mA Output wiring from the transmitter.
Install a 250–600 Ω resistor across the transmitter's primary mA Output terminals.
Check the voltage drop across the resistor (4–20 mA = 1–5 VDC for a 250 Ω
resistor).
If voltage drop is less than 1 VDC, add resistance to achieve a voltage drop of greater
than 1 VDC .
Connect a Field Communicator directly across the resistor and attempt to
communicate (poll).
If communication with the transmitter cannot be established, the transmitter may
need service. Contact customer service.
Set HART Address as appropriate for your HART network.
www.hartcomm.org
Micro Motion Model 1500 Transmitters with Analog Outputs