DIGISPENSE 3009 CONTROLLER MODULE, STYLE B Page 3-7
29 October, 2019 IVEK Corp. P03R017E
3.1.7 Drawback
Drawback is provided in Dispense and Meter modes to allow the fluid to move in the opposite direction after a
dispense to better separate the fluid at the tip. Often, high viscosity or “stringy” fluids are susceptible to poor
separation at the end of a dispense. Drawback provides a snapping motion in the fluid to attempt to shear it off at the
tip. There are three parameters available for configuration of Drawback: Drawback Volume, Drawback Rate, and
Drawback Dwell.
The Drawback Volume determines the amount of fluid to move backwards after a dispense. Typically, this is
configured for a small fraction of the dispense volume.
The Drawback Rate determines the rate of fluid movement during the backwards drawback.
The Drawback Dwell determines the amount of time the fluid movement pauses between the end of the cycle and the
beginning of the next cycle. Typically, this is left at the default value, but may be increased if it benefits the application.
3.1.8 Torque
The torque setting determines the peak current available to the motor. Increasing the torque decreases the
probability of stalling with high viscosity fluids. Decreasing the torque increases efficiency by decreasing steady state
heat loss in the motor when using low viscosity fluids.
Advantages Disadvantages
Decreased Torque Reduced heat loss in the motor Higher probability of stalls
Increased Torque Lower probability of stalls Increased heat loss in the motor
3.1.9 Initial Rate
The initial rate determines the speed at which acceleration starts. Increasing the initial rate may decrease the overall
dispense cycle time. Decreasing the initial rate may help overcome stalling with larger motors. Typically, this is left at
the default value.
3.2 ELECTRICAL
This device complies with Part 15 of the FCC Rules. Operation is subject to the following two conditions: (1) this
device may not cause harmful interference, and (2) this device must accept any interference received, including
interference that may cause undesired operation. Industry Canada Compliance to CAN ICES-3 (A)/NMB-3(A).
3.3 STANDARD OPERATION
The Controller Module provides the controls for producing liquid flow via a positive displacement pumping mechanism.
The systems utilize solid-state electronics, stepping motor drives, and precision machined ceramic pump heads.
These components combine to provide exceptional accuracy and precision (0.1% or less is achievable), high
reliability, and low maintenance.
Volume commands for the Controller Module use number of full strokes. Rate commands are in revolutions per minute.
Pumping is started using the Start push-button based on the screen being viewed (Prime, Dispense, Meter). Push
the Stop push-button to stop Meter operation or to stop Prime and Dispense operation before their respective
volume setting is reached.
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