HS50_advance_level 2.pdf - 第358页
S tudent Guide HS-50 Ad vanced II 12 S pecial handlin g for th e Z-axis Edition 0 7/2002 14 3LFNXSL QPRGH &RQW DFW OHVVD QG PRGH&DOLEUDWHSL FNXSKHLJKW 6LJQD OVIURPWRS WRERWWRP …
Student Guide HS-50 Advanced II
Edition 07/2002 12 Special handling for the Z-axis
13
3LFNXSLQPRGH&UHHSVWDUW
6LJQDOVIURPWRSWRERWWRP
Positional deviation: 200 mV 20 ms
Force signal: 5 V 20 ms
Iactual: 5 V 20 ms
Vtarget: 5 V 20 ms
"Standard" mode 1 was used for pick-up here (see the package form description).
Mode 4 "Creep start" was selected for the initial motion upwards in order to securely hold the
component on the nozzle,
recognizable by the long "start time" when the nozzle moves upwards.
Reduction of force after braking has begun in order to pick up the component from the feeder
without damaging it.
Mode 4 "Creep start" is selected in the package form description when the components cannot be
securely picked up from the feeder. This mode can be selected regardless of the nozzle size. As
already pointed out on the line computer user interface, the pick-up operation takes significantly
longer than mode 3 "Slow start".
Disadvantage: The pick-up operation takes about 120 ms longer.
Student Guide HS-50 Advanced II
12 Special handling for the Z-axis Edition 07/2002
14
3LFNXSLQPRGH&RQWDFWOHVVDQGPRGH&DOLEUDWHSLFNXSKHLJKW
6LJQDOVIURPWRSWRERWWRP
Positional deviation: 2 V 20 ms
Force signal: 5 V 20 ms
Iactual: 5 V 20 ms
Vtarget: 5 V 20 ms
Calibrate the end signal from the oscilloscope memory
"Contactless" mode 17 was used for pick-up here.
With the "Pick-up without contact" option activated, the height was calibrated during the first pick-
up operation
by pressing the component onto the PCB using force level 5 (end signal delayed).
The sleeve spring was complete compressed,
this results in a positional deviation of about 55 digits after the
bottom light barrier has responded.
"Contactless" mode 17 is selected for picking up 0201 package forms (0.5 x 0.25 mm) so that they
can be securely picked up from the feeder (you can try to place package forms up to 0603).
In this mode the Z-axis is positioned at the absolute pick-up height (= calibrated height - 55 digits).
After 4 pick-up errors the pick-up height is recalibrated just like during the first pick-up operation
with the "Pick-up without contact" option activated. Mode 18 "Calibrate pick-up height" cannot be
programmed on the LC.
Student Guide HS-50 Advanced II
Edition 07/2002 12 Special handling for the Z-axis
15
&RQWDFWOHVVSLFNXSLQPRGH
6LJQDOVIURPWRSWRERWWRP
Positional deviation: 2 V 20 ms
Force signal: 5 V 20 ms
Iactual: 5 V 20 ms
Vtarget: 5 V 20 ms
Calibrate the end signal from the oscilloscope memory.
With the "Pick-up without contact" option activated, the component was picked up at the calibrated
pick-up height.
Absolute positioning: The counting of the positional deviation below is not started.
The time spent over the component is the result of switching on the vacuum.
The force is only reduced during the braking phase.
The downward positioning operation takes about 25 ms
instead of 60 ms when calibrating.