Troubleshooting - Emerson Rosemount 3144P Reference Manual

HART Commissioning
December 2019
3.21.1 Output trim
HART 5 Fast Keys
HART 7 Fast Keys
The D/A Trim command allows the user to alter the transmitter's conversion of the input
signal to a 4–20 mA output (see
output signal at regular intervals to maintain measurement precision. To perform a digital-
to-analog trim, perform the following procedure with the traditional Fast Key sequence.
3.21.2 Scaled output trim
HART 5 Fast Keys
HART 7 Fast Keys
The Scaled D/A trim command matches the 4 and 20 mA points to a user-selectable
reference scale other than 4 and 20 mA (2–10 volts, for example). To perform a scaled D/A
trim, connect an accurate reference meter to the transmitter and trim the output signal to
scale as outlined in the Output trim procedure.
3.22

Troubleshooting

3.22.1 Overview
If a malfunction is suspected despite the absence of a diagnostics message on the Field
Communicator display, follow the procedures described in
transmitter hardware and process connections are in good working order. Under each of
four major symptoms, specific suggestions are offered for solving problems. Always deal
with the most likely and easiest-to-check conditions first.
Advanced troubleshooting information for use with Field Communicators is available in
Table
148
3, 4, 5, 1
3, 4, 5, 1
3, 4, 5, 2
3, 4, 5, 2
3-3.
Output trim or scaled output
Reference Manual
00809-0100-4021
trim). Calibrate the analog
Table 3-2 to verify that
Rosemount 3144P