Reference Manual
00809-0100-4075, Rev BA
October 2010
Smart Wireless THUM Adapter
3-14
Figure 3-26. Wiring Diagram for
THUM Adapter as Router, no
wired device
The 1200 Ohm resistor should be adequately rated for the application (3W
minimum).
LOOP CURRENT TEST
To verify that the THUM Adapter will work under all conditions, a loop current
test should be performed. This test will exercise the loop under the highest
possible voltage drop conditions.
1.
Place loop in manual control.
2.
Drive loop to high alarm level. For details see wired device instruction
manual.
•
When the THUM Adapter is connected to a valve, this will need to be
done at the current source and not from the valve.
•
When the THUM Adapter is connected to a transmitter, this will need to
be performed at the transmitter.
3.
Place the THUM Adapter into fixed voltage drop mode.
AMS
Right click on the THUM Adapter and select
Configure
. When the menu
opens, select
Manual Setup
from the window on the left and select the
Wired
Device
tab on the top. Make sure that the
Time
drop down menu at the bottom
of the page has
Current
selected. Under the
Voltage Drop
drop down menu in
the
Smart Power Options
box, select
Fixed Voltage Drop
. Hit the
Apply
button to make any changes. See Figure 3-27 on page 3-15.
Field Communicator
When communicating to the THUM Adapter select:
Configure - Manual
setup - Wired Device - Voltage Drop Mode
. In the method choose
Fixed
Voltage Drop
.
4.
Verify that the current on the loop reaches the high alarm levels.
5.
Place the THUM Adapter into variable voltage drop mode.
THUM Adapter
Red
Green
Black
White
Ground
250
Ohm
Resistor
1200
Ohm
Resistor
Yellow
24V
Power
Supply
Junction Box
Function
Key Sequence
Menu Items
Voltage Drop
2,2,2,2
Voltage Drop
Содержание Rosemount Smart Wireless THUM
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