User guide

Operation 4-1
4 Operation
Overview
All Century Series systems work in accordance with the same theory of operation demonstrating the
highly developed process control. The main differences in operation between Century Series models
operations are in the operation of the part heaters and options.
In this theory of operation, all configurations are considered and included. However, system operation for
your specific application will vary with respect to part heaters and installed options.
Theory of Operation
Typically, dispensing processes involve each of the critical operations listed below. The way in which
each is accomplished may vary depending upon system configuration.
• Loading and unloading of the part.
• Heating of the part in one or all of the heating zones: Pre-dispense Zone, Dispense Zone, and
Post-dispense Zone.
• Fluid control (heating, pumping).
• Dispensing process control (Dispensing Head control).
Operation
A typical dispensing process is described below. Setup and programming procedures are not included in
this description. Figure 4-1 shows a typical operation flow chart.
A part enters the system.
When a part enters the system, a sensor detects its presence and indexes the part. It is conveyed into the
Pre-dispense Zone. A stop pin drops to stop the part transport. The lift table rises to hold the part in
place. The system can also be configured to move the part directly to the Dispense Zone if required.
The part is heated.
The part heaters turn on and heat the part to a pre-programmed temperature. The part remains in the Pre-
dispense Zone as long as necessary. Pre-programmed timers and/or sensors can be used to tell the
conveyor when to move the part into the Dispense Zone.
The part is conveyed into the Dispense Zone.
The lift table drops, then the part moves into the Dispense Zone. The stop pin drops to stop the part
transport. The lift table rises to hold the part in place during the dispensing process. Another part is
loaded into the Pre-dispense Zone.
The part is heated.
The part heaters for the Dispense Zone heat the part to a pre-programmed temperature.
Dispensing preparations are performed.
The Dispensing Head moves to the Purge Station and performs a purge. The Height Sensor performs a
drop to check and record the height of the part. The dispensing program is executed.
The dispensing patterns are dispensed on the part.
The part is conveyed into the Post-dispense Zone (optional).
When dispensing is complete, the lift table releases the part, then the part moves into the Post-dispense
Zone. The stop pin drops to stop the part transport. The lift table rises to hold the part in place.