Loop Current Test - Emerson Smart Wireless THUM Adapter Reference Manual

Section 3: Mounting
March 2014
3.3

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.
2.
3.
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
Field communicator
When communicating to the THUM Adapter select: Configure - Manual setup - Wired Device
- Voltage Drop Mode. In the method choose Fixed Voltage Drop.
Function
Voltage Drop
4.
5.
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 Variable Voltage Drop. Hit the
Apply button to make any changes. See
Field communicator
When communicating to the THUM Adapter select: Configure - Manual setup - Wired Device
- Voltage Drop Mode. In the method choose Variable Voltage Drop.
Function
Voltage Drop
26
Place loop in manual control.
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.
Place the THUM Adapter into fixed voltage drop mode.
Key Sequence
2,2,2,2
Verify that the current on the loop reaches the high alarm levels.
Place the THUM Adapter into variable voltage drop mode.
Key Sequence
2,2,2,2
Figure 3-27 on page 27.
Menu Items
Voltage Drop
Figure 3-27.
Menu Items
Voltage Drop
Reference Manual
00809-0100-4075, Rev CA
Mounting