Emerson AMS Trex User Manual page 110

Field Communicator application
Note
When the Trex unit powers a FOUNDATION fieldbus device, two internal terminators and a power
conditioner are applied. Ensure the device is not connected to a fieldbus segment, even if the
segment is unpowered.
CAUTION!
Remove the USB cable from the Trex unit before connecting to a device.
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
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102
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.
Connect the FOUNDATION fieldbus Power Plug to the FF pwr terminal and the
positive (red) terminal on the lead set.
Figure 3-42: Connection for powering a FOUNDATION fieldbus device
A. FOUNDATION fieldbus Power Plug
Open the Field Communicator application.
Tap Fieldbus.
Tap Yes when prompted if you want to provide power to the device from the Trex
unit.
The Trex unit provides power and searches for connected devices to display on the
Device List.
User Guide