Emerson AMS Trex Device Communicator User Manual page 160

Fieldbus Diagnostics application
September 2021
5.6
160
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WARNING
Do not add any external power to the device when the Trex unit is powering the device.
This can blow a fuse inside the Trex unit. The repair/replacement will need to be
completed at an authorized service center. Ensure the device is disconnected from the
loop/segment and no other wires are connected to the device before providing power
from the Trex unit.
Procedure
1. Connect the lead set to the FF terminals on the Trex unit and directly to the
communication terminals on the unpowered device. Ensure no other wires are
connected to the device and there is no power to the device. Do not attach to a
junction box.
2. Connect the FOUNDATION fieldbus Power Plug to the FF pwr terminal and the
positive (red) terminal on the lead set.
Figure 5-5: Connection for powering a FOUNDATION fieldbus device
A. FOUNDATION fieldbus Power Plug
3. On the Fieldbus Diagnostics Overview screen, tap Power Supply to enable power
to the device.
The Trex unit powers the device.
4. To stop power, tap Power Supply or disconnect the lead set from the Trex unit.
Connect to an externally-powered fieldbus
segment
You can connect the Trex unit at various points, including at the device terminals or a
point along the fieldbus segment. The example below is for connecting to the fieldbus
segment to take measurements in the Fieldbus Diagnostics application.
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