Emerson AMS Trex User Manual

3.26.6 Gauge charts ............................................................................................................... 119
3.26.7 Graphs .........................................................................................................................120
3.27 Disconnect a device ................................................................................................................... 121
Chapter 4 Loop Diagnostics application ........................................................................................123
4.1 Open or close the Loop Diagnostics application ......................................................................... 124
4.2 Loop Diagnostics screen .............................................................................................................124
4.2.1 View the connection diagram as a full-screen image ....................................................127
4.3 Powering transmitters or positioners from Loop Diagnostics ......................................................127
4.4 Voltage and current measurements in Loop Diagnostics ............................................................129
4.5 Wiring diagrams for the Loop Diagnostics application ................................................................130
4.6 Power a 2-wire transmitter .........................................................................................................136
4.7 Power a 2-wire transmitter and measure analog output ............................................................. 137
4.8 Power a positioner ..................................................................................................................... 139
4.9 Stroke a valve ............................................................................................................................. 140
4.10 Settings for controlling current .................................................................................................. 141
4.10.1 Change the values for the quick buttons ......................................................................141
4.10.2 Change the scale for the up and down arrow keys .......................................................142
4.10.3 Set the duration to change the current ........................................................................ 143
4.11 Loop checks ............................................................................................................................... 143
4.11.1 Measure voltage on an externally-powered loop ..........................................................145
4.11.2 Measure the control system output ............................................................................. 145
4.11.3 Simulate a transmitter on an externally-powered loop for a loop check ....................... 146
4.11.4 Simulate a transmitter on an unpowered loop for a loop check ....................................147
Chapter 5 Fieldbus Diagnostics application .................................................................................. 149
5.1 Open or close the Fieldbus Diagnostics application .................................................................... 150
5.2 Fieldbus Diagnostics Overview screen ........................................................................................ 150
5.3 GOOD, BAD, and CHECK measurements in Fieldbus Diagnostics ................................................153
5.4 Wiring diagrams for the Fieldbus Diagnostics application ...........................................................155
5.5 Power a FOUNDATION fieldbus device ....................................................................................... 157
5.6 Connect to an externally-powered fieldbus segment ..................................................................158
5.7 Measure the DC voltage, noise, and the fieldbus signal .............................................................. 159
5.8 Details screen .............................................................................................................................160
5.9 View the live measurement values in Fieldbus Diagnostics ......................................................... 161
5.10 View help for a measurement .....................................................................................................161
5.11 Noise spectrum ..........................................................................................................................162
5.11.1 View a spectrum of the noise measurement ................................................................ 165
5.12 Settings ......................................................................................................................................166
5.12.1 View or hide the minimum, maximum, and average values for a measurement ...........167
5.12.2 View or hide the device tags when online .................................................................... 167
5.12.3 Set the number of measurements to average .............................................................. 167
5.12.4 Set the range of values for the GOOD and BAD status .................................................. 168
5.12.5 Reset the Fieldbus Diagnostics settings to the default values .......................................168
5.13 Saving measurements to a log file .............................................................................................. 168
5.13.1 Log file overview ..........................................................................................................169
5.13.2 Enable or disable logging .............................................................................................171
5.13.3 Save measurements to an existing log file ................................................................... 172
5.13.4 Transfer a Fieldbus Diagnostics log file from the Trex unit to a PC ................................ 173
5.14 Troubleshooting Fieldbus Diagnostics ........................................................................................174
Appendices and reference
Contents
iv User Guide

Emerson AMS Trex Specifications

General

Brand	Emerson
Model	AMS Trex
Category	Cell Phone
Language	English