Emerson AMS Trex User Manual page 87

CAUTION!
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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.
User Guide
The Trex unit cannot power a 4-wire device. Do not connect Trex unit to the power
terminals of a 4-wire device. This can blow a fuse inside the Trex unit. The repair/
replacement will need to be completed at an authorized service center.
Remove the USB cable from the Trex unit before connecting to a device.
Do not use the Trex unit to power a WirelessHART device. Providing power to a
WirelessHART device may damage the device.
Connect the lead set to the HART + pwr terminals on the Trex unit and to the
communication terminals on the device.
Figure 3-29: Power a HART transmitter
Figure 3-30: Power a HART positioner
Field Communicator application
79