Loop Current Test - Emerson Smart Wireless THUM Adapter Quick Installation Manual

Quick Installation Guide
00825-0100-4075, Rev DA
July 2011

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 23 on
page 18.
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. Verify that the current on the loop reaches the high alarm levels.
5. Place the THUM Adapter into variable 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 Variable Voltage Drop. Hit the Apply button to make any changes. See
Figure 23.
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
Smart Wireless THUM Adapter
Key Sequence
2,2,2,2
Key Sequence
2,2,2,2
Menu Items
Voltage Drop
Menu Items
Voltage Drop
17