Air Products GASGUARD TE10, Installation, Operation And Maintenance Manual, Page: 121 / 196

Section 7: System Description
Revision – September 2009 7 - 13
User Entry Time-Out Feature
Operator Prompts may appear on the LCD display during some operating
sequences. After completing the specified task, the operator must press
. The controller will go to the next step. There is an User Entry
Time Out feature on Operator Prompts. If the task is not completed within the
time limit, the controller initiates a shutdown alarm and drops out of the selected
sequence. The sequence must be repeated from the beginning.
7.5.3 Distribution Mode Menu Operations
Note: The following descriptions of system sequences are not
intended as a guide to operation. Use specific operating
procedures, provided in Section 8, to operate the system.
The following sections provide a brief description of what occurs during each of
the operations in the Distribution Mode Menu.
Process Gas Flow
This operation is highlighted when the desired Branch Target menu is selected. It
starts process gas flow to the process tool for the selected Branch, or stops flow if
the Branch is currently flowing gas.
The start sequence enables all Branch specific process alarms and checks for
adequate process gas pressure.
If problems are found, an alarm is displayed. Details of these alarms are located in
Section 11 (System Specific Information) of this manual.
If no problems are found, flow is started and continues until a process stop is
selected, or an alarm condition causes a shutdown. The excess flow alarm is
disabled for a brief variable time at the start of flow to prevent false trips during
initial filling of the process line.
Line Purge
NOTE: Line refers to the component assembly within the Branch
that can be removed for maintenance or replacement. The Branch
outlet manual valve is closed during the Line purge sequence.