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Connection for an externally-powered 2-wire transmitter
Figure 3-28:
A. Voltage source
b. Tap
HART
.
c. Tap
No
when asked if you intend to provide power.
d. Tap
Transmitter
.
e. Tap
No
when asked if you want to change polling. (This assumes the device is at
address zero.)
f. Tap
Yes
when asked if you want to increase loop resistance.
g. Tap
Next
.
A message is displayed to indicate the internal resistor is being enabled.
3.
To disable the internal resistor, disconnect the device from the Trex unit, or close
the Field Communicator application.
3.12
Power and connect to a HART device
The Trex unit can provide up to 16 volts (at 22.5 mA) to power a HART device. The Trex
unit must have the Device Communicator Plus communication module to power a HART
device (transmitter or positioner).
You do not need to add an external resistor. The Trex unit has a 167 Ohm internal resistor
in the HART + pwr terminals that is used when the Trex unit powers the transmitter.
If you try to apply power from the Trex unit when the device is externally-powered, the
Field Communicator application prevents the Trex unit from supplying power. This
protects the Trex unit from damage.
Field Communicator application
78
User Guide
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 ...