ACT - Accuracy Check Tool mit SSW 6xx User Manual 2017 - 第126页
ACT with SSW 6xx / User Manual 07/2017 Edition 62 6 Troubleshooting 6.1 Specification of False Placemen t Programs If other data is specif ied by SIPLA CE Pro or changes on t he ACT objects are per formed in SIPLACE Pro …
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6 Troubleshooting
6.1 Specification of False Placement Programs
If other data is specified by SIPLACE Pro or changes on the ACT objects are performed in
SIPLACE Pro (directory names and object names of components), the following error messages
occur at the station.
ACT in station software 605.x
6.2 Measuring Errors
6.2.1 Several Components Cannot be Measured
The ACT measurement is performed with front-light.
I.e. the illumination of the board camera is used to illuminate the component on the plate.
To keep the contrast in the image constant, the so-called light plate (black protective plate) is used
at the bottom side of the ACT glass plate.
Possibly, this light plate was not inserted or it is scratched or dirty.
See section 4.2.3.
6.2.2 Dirty Components / Foil
In principle, the double-sided adhesive foil can be used several times until (too many) measuring
errors or runaway values occur.
"Runaway values" are often caused by dirt on the adhesive foil.
E.g.: crumbs, lint, hair, rubbed-off parts from the scraping equipment (e.g. board edges), locally
concentrated adhesive/scraps, etc.
These particles may interfere with the optical measurement of the fiducials or cause the
components to slip, tilt or rotate during placement, which must not be charged to the placement
process.
► Check the foil after each scraping with sufficient illumination from several angles.
If the number of error measurements exceeds a certain limit, the overall result is statistically
doubtful or an indication of another problem.
Until station software 707.x there is no output which features were not detected.
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Examples of error measurements
From the video view at the station – up to 10 (part of) images of the buffer are visible:
In the second of 4 part images of a glass component (image in the middle) the upper two fiducials
are clearly covered by the used adhesive foil.
However, this error measurement will first be output with the last part image and is not integrated in
the calculations of the placement accuracy.
Cleaning the glass components
The CC02-05 glass components must not be cleaned in an ultrasonic bath.
► Clean the glass side of the components with a lint-free cloth and glass cleaning agent (alcohol).
► Brush the holes at the top (with the fiducials) carefully with a fine brush.
NOTICE
The glass disk is glued into the plastic housing. The disk is only 0.2 mm thick.
► Therefore, when cleaning the fiducial holes, be careful not to pressure the brush on
the glass.