How The 1500 Series Dispensers Work - EFD 1500XL Operating Manual

How the 1500 Series Dispensers Work

With the air connected and the power on, here's what happens when you
press the foot pedal.
(1) The digital solid-state timer is energized and begins dispense cycle
countdown.
(2) The timer opens a solenoid and closes the vacuum pressure for all
1500 Series dispensers except the 1500D, allowing preset air pres-
sure to flow to the barrel reservoir.
(3) The air pressure pushes the liquid out the dispensing tip.
(4) At the end of the preset time, the timer shuts off, closing the solenoid
and exhausting the air in the barrel.
Note: For all 1500 Series dispensers except the 1500D, the vacuum
is created by air pressure bleeding through the vacuum transducer.
The amount of vacuum is controlled by a vacuum control.
This completes the pulse cycle.
When the timer bypass button is pressed and the display shows dashes,
the microprocessor switches to direct solenoid control by the foot pedal. As
long as the foot pedal is pressed, the solenoid remains open, providing a
bypass flow of liquid for filling or striping.
Suggestions & Reminders
1. Always use an EFD piston to make barrel loading, dispensing and
handling cleaner, safer and more accurate.
Caution (for all 1500 Series dispensers except the 1500D): If you dispense
watery-thin liquids and do not use LV Barriers
pressure rapidly and do not tip the barrel. Vacuum may pull fluid into the
air hose; or when tipped, fluid may run back into the dispenser.
2. Always use new barrels and tips. Carefully dispose of after use. This
procedure ensures maximum cleanliness, prevents contamination
and provides proper safety.
3. To ensure smooth fluid flow from the tip and to make consistent
deposits, always have the tip at about 45° to the work surface.
30
™
—do not increase vacuum