00196044-05 - sg x und x4i fse_en.pdf - 第334页
Collect, Pick and Place Head (CPP) Pickup and Placement Cycle for CPP St andard Mode - Placement: Z Axis Down S tudent Guide (FSE) SI PL ACE X Series and X4I Collect, Pick and Place Head (CPP) Edition 01/2 009 EN 334 8.4…
Collect, Pick and Place Head (CPP)
Detailed Standard Pickup Procedure: Z Axis Up Pickup and Placement Cycle for CPP
Student Guide (FSE) SIPLACE X Series and X4I
Edition 01/2009 EN Collect, Pick and Place Head (CPP)
333
8.4.12 Detailed Standard Pickup Procedure: Z Axis Up
8-13: Detailed pickup procedure: Z Axis Up
LB down switches:
Vacuum Threshold comp. picked reached?
YES
Z axis starts:
Z axis starts positioning upwards
Component sensor switches due to Z axis
movement:
Z axis position value; nozzle length +
comp.height measurement threshold
reached? YES
Z axis position in safety area:
reset light barrier state,
X, Y gantry axes start
start component feeder (communication to
feeder table)
Vacuum query:
Vacuum threshold for holding circuit reached?
YES
Star axis starts.
NOTE:
Since the travel paths for each axis can be calculated and are therefore known, the next action
(e.g. starting the Z axis) is started via position flags. These are sent by the predecessor action
(e.g. star axis). This enables the Z axis to start moving 10 ms earlier (depending on the
definition). It no longer needs to wait for the end position signal from the star axis. The end
position signal is therefore no longer in use.
Collect, Pick and Place Head (CPP)
Pickup and Placement Cycle for CPP Standard Mode - Placement: Z Axis Down
Student Guide (FSE) SIPLACE X Series and X4I
Collect, Pick and Place Head (CPP) Edition 01/2009 EN
334
8.4.13 Standard Mode - Placement: Z Axis Down
Axis controller:
Enable signal for "light barrier down" function
LB down switches:
End signal Z axis positioning downwards;
Digital pressure control valve: switches "Air blast ON"
Pickup/placement position; air blast threshold "place component"reached? YES
8-14: Detailed component placement procedure: Z Axis Down
In this mode (light barrier down) the placement
force at the placement head is around 2N.
End position signal for X and Y axes--> Z axis
starts:
Positioning of Z axis downwards
Component sensor checks nozzle length with
component. Z axis measurement value -
nozzle length "with component" - threshold
reached? YES
End position signal for star axis:
Performs vacuum test "before placement".
"Vacuum closed" threshold reached? YES to
determine whether the component is held by
holding force on the nozzle.
Collect, Pick and Place Head (CPP)
Standard Mode - Placement: Z Axis Up Pickup and Placement Cycle for CPP
Student Guide (FSE) SIPLACE X Series and X4I
Edition 01/2009 EN Collect, Pick and Place Head (CPP)
335
8.4.14 Standard Mode - Placement: Z Axis Up
8.4.15 Optical Nozzle Query
After the reference run, the gantries move into the wait position and performs the first nozzle
scanning. During the production, a nozzle scanning run is performed after 350 head cycles (can be
set by Siemens service if required) and after the completion of the board currently processed. This
ensures that the nozzle quality is continually checked during the production process:
– All nozzles listed in the scan parameters of the station database will be measured by the
component camera.
– If there is any deviation from the defined size, shape or brightness, the machine will show the
message:
Nozzle worn down or contaminated
.
Tiny nozzles may touch the solder paste or the glue because of component shift and the minimum
component height.
The number of components per segment (number of head cycles), after the next nozzle query has
been performed, should be adjusted to the customer's process requirements. This check is always
performed after completing PCB processing.
8-15: Detailed component placement procedure: Z Axis Up
LB down switches:
...
Pickup/placement position; air blast threshold
"place component"reached? YES
Start signal for upwards movement
Z axis starts:
Z axis positioning upwards
Head firmware:
Digital pressure control valve: switches air
blast OFF
Reset "light barrier down" signal
Axis controller:
Z axis measurement value for nozzle "empty"
and
Z axis in safe area =
Enable X, Y gantry axes.
Vacuum query:
Vacuum threshold for holding circuit reached?
YES
Star axis starts.
NOTE:
The nozzle quality check can be configured in four different levels, via the station
interface.