D-serie LEVEL II.pdf - 第137页

C&P6/12 Placement Head Z-Axis Up Travel Profile - Pickup S tude nt Guide Advanced Level 2 SIPLACE D Series EN 05/2007 C&P6/12 Placement Head 8-1 1 Legend 1. End posit ion signal for X- axis 2. End posit ion signa…

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C&P6/12 Placement Head
Travel Profile - Pickup Z-Axis Up
Student Guide Advanced Level 2 SIPLACE D Series
C&P6/12 Placement Head EN 05/2007
8-10
8.3.2.2 Special Mode Pickup with "Reduced Speed" Z-axis Upwards
If the reduced Z-axis speed is set to 98.1 % for the nozzle, the SR/MC 40X/501/502 SW will position as
follows in this special mode. From LRU/LRL 503 and SIPLACE Pro 1.4/2.0, this can be selected as "slow
start upward" in the component shape programming of stations with SW version SR/MC 503 or higher.
8.3.2.3 Benefits of the Special Mode "Slow Speed Upwards" and "Creep Speed Start"
The function change "slow speed" (reduced speed SR/MC 407) offers the following benefits:
Increases the pickup reliability for all nozzle types and for heavy/exotic COs. During the slow start,
the vacuum has the chance to develop its full holding force. An exotic component and /or a heavy
component will therefore remain safely on the nozzle!
There is no danger of head contamination for nozzle types with large openings.
However, this option makes the pickup procedure around 20 ms longer than the standard pickup
procedure.
Irrespective of the special modes, the acceleration values in the nozzle handling from SW version
503 onwards can be reduced further if required.
You can also specify the Z-axis down waiting period if you are using special feeder constructions.
8-8: Detailed pickup procedure: Z-axis upwards with reduced speed
LB down switches:
End position signal for positioning Z-axis
down; Both actions completed? (switched to
vacuum and end position signal Z-axis)
Start signal for upwards movement
Z-axis starts:
Positioning of Z-axis upwards
Special procedure: with low starting speed for
the first mm (takes approx. 20 ms longer), so
that the vacuum in the nozzle has time to
develop completely (up to 502 / this is
activated with 98% of normal acceleration).
After this, the speed depends on the selected
reduced value.
LB up:
Reset the LB down signal
1. vacuum query "Component picked up?"
Start signal for gantry axes
Communication with the changeover table: all
feeders (in this special mode): "Close feeder
flap" and feeder lift
Z-axis end position signal (Z-axis at 0 position, DP
station swiveled out):
2. vacuum query "Component picked up?"
Start signal for star axis
ATTENTION:
The mode "creep speed start" does not usually provide any additional benefits (except in the
case of pickup from surftape) but does reduce the placement performance considerably.
C&P6/12 Placement Head
Z-Axis Up Travel Profile - Pickup
Student Guide Advanced Level 2 SIPLACE D Series
EN 05/2007 C&P6/12 Placement Head
8-11
Legend
1. End position signal for X-axis
2. End position signal for star axis
3. Uncommutated current for Z drive
4. End position signal for component pickup with
early vacuum and standard acceleration up
5. End position signal for component pickup with
early vacuum and slow start up
Legend
1. End position signal for X-axis
2. End position signal for star axis
3. Uncommutated current for Z drive
4. End position signal for component pickup with
early vacuum and creep start up
5. End position signal for component pickup with
early vacuum and standard acceleration up
C&P6/12 Placement Head
Travel Profiles - Placement Z-Axis Down
Student Guide Advanced Level 2 SIPLACE D Series
C&P6/12 Placement Head EN 05/2007
8-12
8.4 Travel Profiles - Placement
8.4.1 Z-Axis Down
8.4.1.1 Standard Mode - Placement: Z-Axis Down
8-9: Detailed component placement procedure: Z-axis down
The placement force is roughly 2.4 N in this
operating mode, with light barrier down on the
C&P12.
End position signal for X/Y and star axes:
All 3 end position signals available
Perform vacuum test "before placement". This
determines whether the component is at the
nozzle.
Z-axis starts:
Positioning of Z-axis downwards
LB up switches:
Electromagnetic valve for air blast ON
Release signal for function LB down
LB down switches:
End position signal for positioning Z-axis
down;
And valve positioning drive pickup/placement
position ON for air blast
Legend
1. End position signal for Y-axis (position to next
placement position)
2. End position signal for star axis
3. Uncommutated motor current for Z-axis
4. End position signal for Z-axis