DIGISPENSE 3009 CONTROLLER MODULE, STYLE B
Page 3-6
29 October, 2019
IVEK Corp. P03R017E
3.1.2.8 RS485 Connector (Figure 3.2 Item 8)
The RS485 Connector Provides control of all functions and allows for multi-drop communication. Refer to Section
3.3.9.4 for additional information.
3.1.2.9 LOGIC I/O Connector (Figure 3.2 Item 9)
The LOGIC I/O connector is used for making the electrical connection to the LOGIC I/O Interface Device. Refer to
section 3.3.9.3.
3.1.3 Fluid Movement
Fluid movement in the system is achieved by the displacement actions of the pump. A piston rotates in the pump
chamber moving fluid in and out of ports. The piston rotates to move a flat on the piston between the two ports to
achieve the desired fluid movement through the system. The movement of the piston is initiated by a Motor/Base
Module driven by a motor. The Controller Module provides the control and power to the motor to achieve the desired
fluid movement.
Fluid movement is controllable from two different contexts: Production Mode and Fluidic Setup Mode. Production
Mode is intended for normal controlled fluidic movement operations and Fluidic Setup Modes are intended for
preparing the entire fluidic system for those controlled operations.
3.1.4 Dispense Rate
The optimum value of the Dispense Rate needs to balance decreasing cycle times with an increasing risk of
cavitations of the fluid reducing repeatability. Also, since motor torque decreases with increasing speeds, the
probability of stalling the motor in the Motor/Base Module increases, especially when the viscosity of the fluid is high.
Advantages
Disadvantages
Decreased Rates
Lower probability of stalls& fluid cavitations
Longer cycle time
Increase Rates
Shorter cycle time
Higher probability of stalls & fluid cavitations
3.1.5 Direction
The direction setting determines the direction of fluid movement through the Pump Module.
When the direction is forward, the piston rotates clockwise which causes fluid to move into one port and out of the
other.
When the direction is reverse, the piston rotates counter-clockwise which causes fluid to move through the ports in the
opposite direction relative to the forward setting.
3.1.6 Acceleration
The Acceleration setting determines how quickly the motor reaches the dispense rate from a stopped position. It is
also used to determine deceleration; how quickly the motor slows down when heading towards stop. Increasing the
acceleration may help increase the shearing of certain fluids from the tip improving repeatability. However, with higher
accelerations, high viscosity fluids may be more susceptible to causing the Motor/Base Module motor to stall.
Advantages
Disadvantages
Decreased Acceleration
Lower probability of stalls
Less shear at tip
Lower probability of fluid cavitations
Slightly longer cycle time
Increased Acceleration
More shear at tip
Higher probability of stalls
Slightly shorter cycle time
Higher probability of fluid cavitations