Emerson AMS Trex Device Communicator User Manual page 150

Loop Diagnostics application
September 2021
4.11.4
150
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2. On the Loop Diagnostics screen, tap Trex Unit Current.
3. Tap one of the quick buttons to increase the current being supplied, use the up and
down arrow keys, or tap the pencil icon to enter a new value.
4. Verify the digital control system is reading the same current value.
Simulate a transmitter on an unpowered loop for a loop
check
The Trex unit can provide power and control current to simulate a device for a loop check.
In this setup, the control system is not providing power to the device. This task is used if
the loop will have a 4-wire transmitter.
The Trex unit supplies loop power from the HART + pwr terminals, and Loop Diagnostics
lets you control the current on the loop.
Procedure
1. Connect the lead set to the HART + pwr terminals on the Trex unit and to the
unpowered loop.
Figure 4-20: Connection for providing power and simulating a transmitter
A. Analog input.
2. On the Loop Diagnostics screen, tap Trex Unit Power.
3. Tap Simulate Transmitter with 4 mA.
4. Change the current value by pressing the quick buttons or the up and down arrow
keys.
5. Verify the digital control system is reading the same current value.
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