Fishman AIRFREE LDS9000 - Manual (Page 26)

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With the power ON, here’s what happens
when you press the foot pedal:
The program is engaged, the motor is energized beginning the dispense
cycle countdown.
The motor pushes the lead screw, with piston attached to the end,
down the barrel pushing the liquid out the dispensing tip.
At the end of the program, the motor is de-energized—stopping
forward movement of the lead screw and stopping all fluid flow.
If drawback is programmed, the motor is re-energized and begins a
drawback cycle countdown.
The motor retracts the lead screw, with piston attached to the end,
creating a vacuum that stops any post dispense oozing. The vacuum is
controlled by the software program.
When in manual mode the microprocessor switches to direct motor
control by the foot pedal. As long as the foot pedal is pressed, the motor
remains energized, providing a flow of liquid for filling or beading.
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How the LDS9000 Works