D-serie level 1 EN - 第75页

Reference Run Height Reference Run Reference Run (D-Series) S tude nt Guide Advanced Level 1 SIPLACE D-Series EN 05/2007 Reference Run 5-7 5.1.4.3 Rot ating the Nozzles into the 0 Degrees St arting Position While the va …

Reference Run

Reference Run (D-Series) Vacuum Reference Run

Student Guide Advanced Level 1 SIPLACE D-Series

Reference Run EN 05/2007

5-6

5.1.4.2 Determining the Vacuum and Threshold Values

5-6: Measuring and calculating the vacuum values for a reference run

Legend

1. The vacuum is measured twice during the reference run:

– Once with closed

– and once with open valve, while air flows through the nozzle.

2. The value with closed valve depends on the ambient pressure and may vary, according to the local

weather conditions and altitude. The higher the ambient pressure, the lower the vacuum at closed

valve.

3. The value with open valve depends on the nozzle size and condition. The smaller the nozzle, the

greater the open valve value will be. A contaminated or blocked nozzle will also give a higher valve.

4. The difference between the open and closed nozzles has been preset by the line controlling line

computer (LC or SIPLACE Pro), as a minimum value. This value is different for all nozzle types e.g.

120 mbar for 914 and 904 nozzles. If these values are not achieved, the error message

"Vakuumdifferenz offen-geschlossen zu gering" (vacuum difference open-closed is too low) will

appear.

5. The threshold for component acceptance is also set now. In this case we have a value of 700 mbar

when the nozzle is open and a value of 900 mbar when the nozzle is closed. The calculation is

performed as follows:

Threshold = (900(closed) - 700(open))= x 0.2 + 700(open) = 200 x 0.2 + 700 = 740

Reference Run

Height Reference Run Reference Run (D-Series)

Student Guide Advanced Level 1 SIPLACE D-Series

EN 05/2007 Reference Run

5-7

5.1.4.3 Rotating the Nozzles into the 0 Degrees Starting Position

While the vacuum values are being measured, the turning station can rotate all segment sleeves into the

0° starting position.

Sequence:

X The star axis rotates all segments through the working positions.

X The turning station swivels in during vacuum measurement.

X The axis controller positions the relevant segment at the light-dark transition, which represents the

0 degrees position of the sleeves. (The long side of rectangular nozzles in the X direction.)

X – The turning station is swiveled out again by a CAN bus command .

5.1.4.4 Nozzle Scanning

While the vacuum values are measured, the camera tests the empty nozzles for contaminants.

Sequence:

X The star axis rotates all segments through the working positions.

X The component camera illuminates the nozzle and measures its outer and inner contours.

X If the nominal dimensions are not met, a "nozzle dirty" error message is issued.

The vacuum reference run is now finished.

5.1.5 Height Reference Run

5.1.5.1 Head Height Check and Nozzle Length Measurement

This part of the reference run is performed in sequence at the gantries of the relevant processing area,

as the X/Y height measurement position needs to be the same for both gantries.

Sequence:

X The gantry axes move the placement head over the height measurement position on the fixed

conveyor side.

X The Z-axis moves segment 1 down, as far as the end stopper.

X The Z.axis "height position" is read out of the Z-axis position counter.

X The Z-axis is moved up again, to the 0 position.

X This process is repeated for all the segments of the relevant placement head and then for the 2nd

gantry.

X A nozzle length error is issued if the values deviate by more than+/- 0.4 mm from the nozzle 1

measurement. The nozzle causing this error must then be replaced before starting placement

operations.

NOTE:

All measurement values are accepted for special nozzles in the X9X series.

Reference Run

Reference Run (D-Series) Repeating Measurement of Values During Placement

Student Guide Advanced Level 1 SIPLACE D-Series

Reference Run EN 05/2007

5-8

5.1.5.2 Nozzle Length Measurement in the Component Sensor

If the component sensor option is installed and configured on the C&P12 placement head, the MC will

issue a CAN bus command for nozzle length measurement to be performed in the component sensor,

provided the nozzle to be set up is long enough (for nozzles longer than 12 mm, appropriately longer

than a 915 nozzle).

X The shadow cast by the component sensor IR laser beam is measured during star rotation.

X The programming system prescribes the nominal parameters for dynamics, length and vacuum

checks, for the nozzle type concerned.

X The measurement is saved as the reference length for the empty nozzle.

Empty nozzles are then compared to this reference value, before the component to be checked is

taken up. A "nozzle length error in component sensor" is issued if the value deviates by +0.15/

-0.1 mm.

The whole reference run is now finished. If no error messages have been issued, the station is now ready

for placement operations. The message "Waiting for PCB in input conveyor" will be shown.

5.1.6 Repeating Measurement of Values During Placement

The following reference value measurements are achieved by remeasuring the reference values after

350 components have been placed per segment, at the end of PCB placement.

X Vacuum "open" and "closed" measurements

X Nozzle scanning

X Reference nozzle length in component sensor option for C&P12 head

5-7: Nozzle length reference values for component recognition in the

component sensor option

Legend

1. IR receiver on C&P12 head back part

2. Nozzle

3. IR transmitter on C&P12 head front part