Owner's manual

Beginning Programming 6-41
6.7.2 Flow Rate/Dot Weight Parameters
Flow Rate/Dot Weight Parameters are defined in Fluid Setup and must closely resemble fluid dispensing
conditions during your production run. Flow Rate parameters include:
 Calibration Frequency
 Dispense Duration and Time between Dispenses
 Dispensed Weight Bias
 Valid Flow Rate/Dot Weight Range
 NOTE For additional information, refer to 5.4.1 Fluid Setup.
6.7.2.1 Dispensed Weight Bias
Dispensed Weight Bias is generally used with Weight Control Lines. If the weighed fluid is consistently
over or under the desired percentage of fluid after a flow rate calibration, you can set the bias to
compensate for the variation. Bias is necessary to ensure consistent fluid dispensing.
When creating a dispensing program, typically several samples of a dispensed pattern are weighed to
make sure that the proper amount of fluid is being dispensed. If the amount of fluid actually dispensed is
consistently over or under the desired amount, Dispensed Weight Bias can be used to adjust the amount
(weight) of fluid dispensed. All Line Parameters are automatically adjusted to ensure that the fluid is
evenly distributed.
 NOTE If Local Machine Offsets is active, the “Dispensed Weight Bias” parameter will be
labeled “Local Machine Valve Bias.
6.7.2.2 Valid Flow Rate /Dot Weight Range
The Valid Flow Rate/Dot Weight is the acceptable range for the flow rate or dot weight measurements
taken during a calibration. If the measurement falls outside of this range, an error will be displayed.
6.7.3 Measure Flow Rate Command
The Measure Flow Rate Command is used to perform a Mass Flow Calibration. Measure Flow Rate
simulates fluid dispensing during a production run to ensure flow rate, accuracy, and consistency for
weight control lines and dots. The following occurs during a Flow Rate Measurement:
1. FmXP first conducts a purge to make sure the needle is clear of any obstacles.
2. The dispensing head then moves to the Weigh Station.
3. Fluid is dispensed according to the Flow Rate Parameters established in the Fluid Manager.
4. When complete, a dialog box is displayed detailing the results of the flow rate
measurement.
 NOTE If your system is equipped with the Dual-Action Dispensing Head, you can conduct a
flow rate measurement for each valve, with separate flow rate parameters.