HS50_advance_level 2 - 第367页
S tudent Guide HS-50 Adva nced II Editio n 07/200 2 12 S pecial handlin g for th e Z-axis 23 7 UDYHOS URILOHV LQGHW DL O 3ODFLQJ DFRPS RQHQWLQ6 W DQGD UGPRGH OLJ KWEDUU LHUPRGH 6LJ QD…
Student Guide HS-50 Advanced II
12 Special handling for the Z-axis Edition 07/2002
22
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On the line computers the travel profile for the up and down motion of the Z-axis can be specified
for the placement operation for each package form.
1RWH
The travel profile specification also includes the special handling for packs of 8 nozzles, i.e. there
is no differentiation between nozzle types anymore on the MC.
=D[LVWUDYHOSURILOHGRZQZDUGVRQSODFHPHQW
0RGHNormal downward motion with light barrier at bottom
0RGHCreep mode and light barrier at bottom.
The Z-axis moves about 1mm before reaching the target position with V
min
and the forced air is
activated when switching the light barrier at the bottom.
0RGHCurrent sensor
The Z-axis moves with the current sensor pointed down, i.e. the Z-axis presses the component
into the soldering paste with the placing force defined.
0RGHCurrent sensor with creep
The Z-axis moves with the current sensor pointed down, and the system switches to V
min
1 mm
before reaching the target position, and the component is pressed into the soldering paste with
the specified placement force.
=D[LVWUDYHOSURILOHXSZDUGVRQSODFHPHQW
0RGHStandard mode
0RGHCreep mode, i.e. the Z-axis moves up slowly the first few millimeters.
Student Guide HS-50 Advanced II
Edition 07/2002 12 Special handling for the Z-axis
23
7UDYHOSURILOHVLQGHWDLO
3ODFLQJDFRPSRQHQWLQ6WDQGDUGPRGHOLJKWEDUULHUPRGH
6LJQDOVIURPWRSWRERWWRP
Positional deviation: 200 mV 10 ms
Iactual: 5 V 10 ms
Vtarget: 5 V 10 ms
End signal: 5 V 10 ms
about 28 ms Position when moving down to place the component
on the 12th PCB.
about 12 ms Time on the component to switch on the forced air plus
the system’s reaction time
about 21 ms Position while moving down
Student Guide HS-50 Advanced II
12 Special handling for the Z-axis Edition 07/2002
24
7UDLQLQJWKHSODFHPHQWKHLJKW
6LJQDOVIURPWRSWRERWWRP
Positional deviation: 200 mV 10 ms
Iactual: 5 V 10 ms
Vtarget from the memory of the oscilloscope (long Vtarget signal)
Vtarget: 5 V 10 ms
End signal: 5 V 10 ms
The curve stored for Vtarget shows the first placement operation on the first circuit board. The
other 4 signals show the placement operation for the same component on the 12th circuit board.
This means that the placement operation on the 12th circuit board is about 18 ms faster.
The pick-up height is trained for every placement position on all circuit boards.