Height Sensor - EFD Ultra 325TT User Manual

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A NORDSON COMPANY
4.3

HEIGHT SENSOR

Each Ultra TT system is equipped with a standard tactile height sensor. The height sensor allows
the Operator to activate the dispense gap function in a dot/line parameter.
Note: The "Tip To Probe XYZ Offset" routine (in the Valve Setup window) should be performed
anytime this down speed is changed.
Max Distance: This is the maximum length of Z-head travel for the probe to sense the surface of
the part. Default is 100mm or 3.9in. A shorter distance is preferable but not mandatory. To reduce
the amount of over travel in the event that the surface is not found, the "Max Distance" can be
reduced from the default of full travel (100mm). However, if this value is too short and the probe
does not touch the part surface after traversing this length, an error will occur.
Up Speed: Speed in which the Z-head moves upwards after a height sense. Default is 50mm/sec
or 1.97in/sec.
Retract Distance: After a height sense, the Z-head moves up this retract distance before moving to
the dispense location. Technically, the probe touches, the probe is lifted, wait the "Probe Up Delay"
and then the Z-axis is moved up (a relative move) the "Retract Distance."
Your height sense command should be invoked at a location very close to the dispense
location. For this reason, the default is set at 2.5mm or 0.1in. Amend this retract distance to a
higher value if the height sense was invoked farther away from the dispense location and
the dispense-tip/Z-head needs to clear some obstacles while moving to that location.
Probe Up Delay: This is designed to allow the tactile probe to retract completely before starting any
XYZ movements. The units are in seconds. Default is 0.25 seconds
There are six (6) adjustable parameters for the height sensor:
Probe Down Delay: This is the delay, after the tactile probe is
extended (with a height sense command in a program), and before
the Z-head starts to move. Unit is in seconds and the default is
0.25 seconds.
Down Speed: This is the speed (in mm/sec or in/sec, depending on
the Unit setting) that the Z-head moves downward within a height
sense command. Default is 50.8mm/sec or 2in/sec. Down Speed
has the greatest effect to height sense accuracy and should not
exceed 70mm/sec or 2.75in/sec.
Ultra TT User's Guide
Version 1.2
33