User`s guide

33
4.3 HEIGHT SENSOR
Each EFD
®
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.
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.
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
www.nordsonefd.com [e-mail] USA & Canada 800-556-3484 Europe [phone] Asia [phone]
Sales and service of Nordson EFD dispensing systems are available worldwide.
EFD
®
TT User's Guide
Version 1.2