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4.8
Power a positioner
If you try to apply power from the Trex unit when the device is externally-powered, the
Loop Diagnostics application prevents the Trex unit from supplying power. This protects
the Trex unit from damage.
CAUTION!
Remove the USB cable from the Trex unit before connecting to a device.
CAUTION!
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
HART + pwr
terminals on the Trex unit and to the
positioner.
Connection for powering a positioner
Figure 4-16:
2.
On the Loop Diagnostics screen, tap
Trex Unit Power
.
3.
Select one of the following:
Option
Description
Power Positioner with 4 mA (0%)
Power a positioner using 4 mA.
Power Positioner with 20 mA (100%)
Power a positioner using 20 mA.
Power Positioner with other mA value
Power a positioner using a specified mA
value.
4.
Tap
OK
.
Loop Diagnostics application
User Guide
139
Содержание AMS Trex
Страница 1: ...User Guide Rev 3 August 2017 AMS Trex Device Communicator User Guide ...
Страница 8: ...Contents vi User Guide ...
Страница 130: ...Field Communicator application 122 User Guide ...
Страница 186: ...Fieldbus Diagnostics application 178 User Guide ...
Страница 198: ...Technical specifications 190 User Guide ...
Страница 206: ...Glossary 198 User Guide ...