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6 Reference Run 6.1.4 Vacuum Reference Run 6.1 Reference Run (D/D i-Series) Student Guide SIPLACE D-Series (FSE) 101 ▪ The zero point correction is loaded in the position of the cor rect zero pulse. This ensures correct …
6 Reference Run
6.1 Reference Run (D/Di-Series) 6.1.3 Axis Reference Run
100 Student Guide SIPLACE D-Series (FSE)
▪ Search for the commutation point of the X/Y axes.
▪ Position at the hardware end stoppers.
The Y gantry axes are stepped to the outer end stoppers.
The target position is predefined. If this is not reached and if no counter pulses can be detected at
the incremental encoder, this means that the axis has reached the hardware end stopper.
▪ Reverse direction of axis movement and search for the zero pulse on the incremental scale.
– Load the X or Y axis zero point correction.
The axis reference run is now finished and the axes can be positioned for placement operation.
Searching for the X and Y Commutation Position (A364)
A commutation position search for the 3 phases AC-drives on the gantry starts right after the head axes
reference run is succesfully finished.
1. Commutation position search during initial reference run:
Preconditions and function:
▪ Axis reference run must be successfully completed at the relevant placement heads.
▪ 2 motor phases are switched to the power supply of the servo amplifier.
▪ The 3-phase AC motor moves to the next suitable magnetic position.
▪ 2 other motor phases are switched to the servo power supply and the axis moves further.
▪ These switching steps are repeated multiple times.
The axis reference run is continued with a reference position search for the position measuring system.
Initializing the Position Measuring System
Instead of using proximity switches for the switching points, the system now searches for the hardware
end stoppers of the respective gantry axes.
▪ Positioning with small steps in the mode Standstill search
▪ Target position:
– If the target position is reached, a further step is programmed and positioned in the direction of
the end stopper.
– If the target position is not reached, the system checks whether there are any further count puls-
es are received. If none arrive over a certain period of time, the axis will recognize the reversal
point for gantry positioning and will start to search for the zero pulse.
▪ The axis positions the Y axes towards the machine center and the X axes towards the X-axis deflec-
tion bearings.
▪ The zero pulse is searched for and checked over a short travel range.
Diagram of the incremental encoder with scale
Legend
1. Incremental encoder
2. Test plug for track signals (analog)
3. Incremental scale
4. Increments on the scale (1µm resolution)
5. Zero pulse
6. Connection cable to gantry distributor/gantry head
distributor
6 Reference Run
6.1.4 Vacuum Reference Run 6.1 Reference Run (D/Di-Series)
Student Guide SIPLACE D-Series (FSE) 101
▪ The zero point correction is loaded in the position of the correct zero pulse. This ensures correct po-
sitioning in the subsequent placement operations.
6.1.4
6.1.4 Vacuum Reference Run
Vacuum Reference Run
6.1.4.1
6.1.4.1 Nozzle Cleaning, Followed by Vacuum Measurement
Nozzle Cleaning, Followed by Vacuum Measurement
The vacuum values "open" and "closed" can only be measured if the nozzles have been cleaned by air
blast to remove any contaminants.
Sequence:
► The gantry axes move the placement head to the reject position.
► The star rotates in an anticlockwise direction to move all segments through the working positions.
► The electromagnetic valve is activated in a cycle for "reject component" and "clean nozzle".
► The vacuum "open" and "closed" placement values are measured for the nozzle types.
Should an error occur, this means that the nozzle opening is too small or that the vacuum duct is
blocked. --> exchange the nozzle.
Switching over the valve positioning drives for pickup/
place and reject positions
Legend
1. Starting position. Release star axis movement.
2. 2a: The mode "Valve positioning drive pick/place" is
switched to vacuum for "nozzle open".
2b: The mode "valve positioning drive pick/place" is
switched to vacuum for "nozzle closed". Parallel to
this (diagram 2b) the "valve positioning drive reject" is
switched back to air blast (and then back again).
3. Counter position to initial position. Release star axis
movement.
6 Reference Run
6.1 Reference Run (D/Di-Series) 6.1.4 Vacuum Reference Run
102 Student Guide SIPLACE D-Series (FSE)
6.1.4.2
6.1.4.2 Determining the Vacuum and Threshold Values
Determining the Vacuum and Threshold Values
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 "Vakuum-
differenz 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 per-
formed as follows:
Threshold = (900(closed) - 700(open))= x 0.2 + 700(open) = 200 x 0.2 + 700 = 740
6.1.4.3
6.1.4.3 Rotating the Nozzles into the 0 Degrees Starting Position
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:
► The star axis rotates all segments through the working positions.
► The turning station swivels in during vacuum measurement.
► 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.)
► – The turning station is swiveled out again by a CAN bus command .