5.5 Power a FOUNDATION fieldbus device
The Trex unit can power one FOUNDATION fieldbus device. The Trex unit can provide
approximately 10 volts at 25 mA to power a FOUNDATION fieldbus device. (The Trex unit
will draw approximately 12 mA when it is online)
If you try to apply power from the Trex unit when the device is externally-powered, the
Fieldbus Diagnostics application prevents the Trex unit from supplying power. This
protects the Trex unit from damage.
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
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.
Fieldbus Diagnostics application
User Guide 157
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