00196044-05 - sg x und x4i fse_en.pdf - 第258页
C&P20A Reference Run for C&P20A Head Height Reference Run S tudent Guide (FSE) SI PL ACE X Series and X4I C&P20A Edition 01/2009 EN 258 7.3.6.1 Sequence of Height Reference Run 7-15: Height reference run flow…
C&P20A
Height Reference Run Reference Run for C&P20A Head
Student Guide (FSE) SIPLACE X Series and X4I
Edition 01/2009 EN C&P20A
257
7.3.6 Height Reference Run
With this function we check the correct fitting of the nozzle on the sleeve and that the correct nozzle type
like the programmed one are set to the sleeves. The nozzle length is taken to calculate the pick up and
placement height for the subsequent placements.
7-14: Measuring the nozzle height
Legend
The gantry moves the placement head to the fixed conveyor side at height measurement position.
The star turns the segment for measuring into the pickup/placement position
The value "Vacuum open" is measured for each segment.
The Z axis is positioned downwards:
When the component sensor beam is interrupted, the Z position of the axis is determined for the
component sensor.
When the Z axis touches the conveyor side, the mechanical nozzle length is determined by the Z
position value and the closed vacuum value is measured.
The Z axis is positioned upwards:
When the component sensor beam is no longer interrupted, the Z position of the axis will be
measured again for the component sensor.
1 Top edge of the fixed conveyor side 3 Last step with segment 20 to measure the
nozzle length.
2 First step with segment 1 to measure the nozzle
length.
C&P20A
Reference Run for C&P20A Head Height Reference Run
Student Guide (FSE) SIPLACE X Series and X4I
C&P20A Edition 01/2009 EN
258
7.3.6.1 Sequence of Height Reference Run
7-15: Height reference run flow chart
C&P20A
Determining the Vacuum and Threshold Values Reference Run for C&P20A Head
Student Guide (FSE) SIPLACE X Series and X4I
Edition 01/2009 EN C&P20A
259
7.3.7 Determining the Vacuum and Threshold Values
7-16: Measuring and calculating the vacuum values for a reference run
The vacuum is measured twice at the reference point: first with open and then with closed nozzle
tips.
The value with closed valve depends not anymore on the ambient pressure it is controlled by the
pressure control valve. The nozzle fit (nozzle pickup error) and the quality (contamination/damage)
of the nozzle tip influence the vacuum measurement values.
The value by open valve depends on the nozzle size and condition. The smaller the nozzle, the
greater the open valve value will be. This nozzle-specific value is preset by the SIPLACE Pro
computer. A contaminated or blocked nozzle will also give a higher valve.
The difference between the open and closed nozzles has been preset by the programming system
as an ideal case minimum value. This value is different for all nozzle types e.g. 120 mbar for 1004,
1014 nozzles. If these values are not achieved, the error message "Vakuumdifferenz offen-
geschlossen zu gering" (vacuum difference open-closed is too low) will appear.
The threshold for component acceptance is also set now. Assumed are following values of 660 mbar
In this case we have a value of 660 mbar when the nozzle is open and a value of 852 mbar when
the nozzle is closed. The calculation is performed as follows:
Vacuum distance = (852 (closed) - 660 (open))= 192 mbar
This is greater than the vacuum distance required in the parameter specifications for this nozzle type
(120 mbar). The open vacuum of 660 mbar is significantly greater than the required 250 mbar.