Taylor-Wharton Auto Fill Laser Pak - Manual (Page 17)

17
OPERATION
These instructions are for operators experienced with cryogenic equipment. Before operating the Auto-Fill
Laser Pak, become familiar with the safety precautions in this manual and in the referenced publications.
Make certain all applicable provisions set forth in the Installation Section have been followed before placing
an Auto-Fill Laser Pak into operation. Study this manual and the general arrangement drawing located in the
back of this manual thoroughly. Know the location and function of all system components.
Controller Operation
The controller, located in the larger fiberglass enclosure, automates the operation of the Auto-Fill Laser Pak.
The controller inputs include: two liquid level transmitters (PT-1A & PT-1B), three pressure transmitters (PT-
2A, PT-2B, and the transmitter for the bulk tank), and the “Start/Stop” push button. Controller outputs
include the eight solenoid valves and the four lights on the front of the enclosure. A graphic terminal user
interface, located inside the enclosure, allows the operator to monitor the system and change settings. A
diagram showing the front of the enclosure, indicator lights, and switches is shown on page 2 of the drawing
titled “Controller, Auto-Fill Laser Pak” in the appendix.
The “Power” selector switch controls all power to the system. It should be in the “Off” position during system
installation and maintenance. If power is turned off or lost, all controller settings will be retained in the
memory. When power is reapplied the controller will automatically restart provided the “Start/Stop” button
remains in the inward position.
The “Start/Stop” button begins and stops the automatic operation sequence described in the Operation
Sequence Section. When the inward position is selected, power to the controller and transmitters remains
active and all the solenoid valves are deactivated. Solenoid valves are closed when deactivated unless
operated by manual override. This allows the operator to adjust the controller settings without running the
system. When the Start/Stop button is pulled outward, the controller begins the operation sequence.
The “Alarm” selector switch controls the user-installed alarm. In the “Off” position the alarm will not
function. In the “On” position the alarm will activate when the controller determines that an error has
occurred.
The “System Running” light indicates that the system is at the correct pressure and operating normally. The
“System Start” light becomes illuminated after pressing the “Start/Stop” button. It remains lit while the
system is filling or pressurizing at the beginning of the operation sequence. The “System Stop” light indicates
that the “Start/Stop” button has been pushed inward. It also becomes lit when the controller has stopped the
operation sequence due to an error condition.
The “Error” light indicates that the controller has detected an error condition. The controller activates the
user-installed alarm and the “Error” light simultaneously. Read the Error Conditions section for an
explanation of controller detectable errors.
Graphic Terminal Operation
System operation can be monitored or adjusted using the graphic terminal. It is located inside the panel in the
upper-right corner. Function keys, labeled F1 through F8, allow the operator to select the various screens.
Scroll through the settings displayed on the screen by pressing the left or right arrow keys. Change a setting
by scrolling to it and pressing the Enter key. Type the new value using the keypad. Pressing the Backspace
key deletes the last character entered. If all characters are deleted, pressing the Backspace key returns to the
previous screen without changing the value. Pressing the Enter key sets the value and returns to the previous
screen.