Dot Parameters Explained - EFD Ultra 325TT User Manual

Ultra TT User's Guide
®
Version 1.2
A NORDSON COMPANY
APPENDIX D

Dot Parameters Explained

Dot parameters control the different aspects of a dot dispense command. They need to be set
prior to running a program. Although the program already has default settings, it is highly
recommended that the User Operator review and set each Line Parameter to obtain the desired
application results.
Note: All time-related dot parameters are limited to a maximum of
65.535 seconds.
Down Speed
The Down Speed is how fast the dispensing head lowers to
dispense. The higher the value, the faster the dispensing head will
move. The units are mm or inches/second. Typically, 2 in/sec or
50.8mm/sec is the default setting.
Note that height sense accuracy is dependent on Down Speed.
Dispense Gap
The Dispense Gap is the distance between the substrate you are dispensing on and the needle tip.
This distance is one of the more common adjustments to optimize dispensing programs. Typically,
the Dispense Gap is set to half the dot diameter.
The height sensor affects the dispense gap setting. This parameter is active only when the tip-to-
probe offset has been set and a Height Sense instruction is inserted in the program.
Settling Time
This is the length of time that the dispensing head will wait over the dispensing location before
beginning to dispense. The Settling Time is set to 0, except in special circumstances. For more
information, contact your local EFD representative.
Valve-On Time
This parameter controls the time the valve is opened while positioned over the dispensing location.
The time interval affects dot size, i.e. the longer the Valve-On Time, the larger the dot. The units are
in seconds.
The Valve-On time can be as long as 60 seconds, depending on the desired dot size and fluid
properties. You can elect to dispense multiple shots if your desired deposit size takes longer than
60 seconds to achieve.
Number of Shots
This parameter controls how many shots of fluid will be dispensed at a single location. When
making a larger dot with multiple shots, it is desirable to move the needle up between shots. The
default setting is 1.
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