10 Perform loop current test
To verify 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.
Procedure
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.
Configuring fixed voltage drop mode using AMS Device Manager
a) Right click on the THUM Adapter and select Configure.
b) When the menu opens, select Manual Setup from the window
on the left and select the Wired Device tab on the top.
c) Make sure the Time drop down menu at the bottom of the
page has Current selected.
d) Under the Voltage Drop drop down menu in the Smart Power
Options box, select Fixed Voltage Drop.
e) Select the Apply button to make any changes. See Figure 10-1
Configuring fixed voltage drop mode using Field Communicator
a) When communicating to the THUM Adapter select:
Configure → Manual setup → Wired Device → Voltage
Drop Mode
b) In the method select Fixed Voltage Drop.
Function
Fast Key sequence Menu items
Voltage Drop 2, 2, 2, 2 Voltage Drop
4. Verify the current on the loop reaches the high alarm levels.
5. Place the THUM Adapter into variable voltage drop mode.
Configuring variable voltage drop mode using AMS Device
Manager
Quick Start Guide September 2020
30 Emerson.com/Rosemount
To Next Page
Loading...