00195440-05-SG_D-Series_FSE-EN.pdf - 第166页

9 C&P Placement Heads 9.3 Travel Profile - Pickup 9.3.2 Z Axis Up 166 Student Guide SIPLACE D-Series (FSE) 9.3.2 9 . 3 . 2 Z A x is U p Z Axis Up 9.3.2.1 9 . 3 . 2 . 1 D e t a ile d S t a n d a r d P ic k u p P r o c…

9 C&P Placement Heads

9.3.1 Z Axis Down 9.3 Travel Profile - Pickup

Student Guide SIPLACE D-Series (FSE) 165

Benefit of standard mode for small components "early vacuum"

The function change "early vacuum" offers the following benefits:

▪ Increases the pickup reliability for small nozzle types 901/904. The vacuum begins to build up during

the downwards movement. This ensures, that when the upwards movement begins, an exotic com-

ponent and /or a heavy component will remain safely on the nozzle.

▪ No time loss during pickup (compared to standard pickup).

CAUTION

Cause of Hazard

The risk of head contamination is higher (without additional vacuum formation) when using noz-

zle types with large openings, generally for components larger than 6 mm!

NOTICE

Cause of Hazard

From SIPLACE PRO 3.0 onwards, early vacuum has been replaced by the component shape

library, for components smaller than 6x6 mm.

The time between "end position signal down" and "start

upwards" is shown below in the difference between the

"standard" and "early vacuum" modes.

▪ Standard vacuum 9.4 ms.

▪ Early vacuum 1.2 ms

Downwards positioning takes 3 ms longer for contactless

pickup.

Legend

1. End position signal for Y-axis

2. End position signal for star axis

3. Uncommutated motor currents for Z-axis (2 modes)

4. End position signal for pickup procedure with vacuum

switched on at bottom (standard)

5. End position signal for pickup procedure with early

vacuum

9 C&P Placement Heads

9.3 Travel Profile - Pickup 9.3.2 Z Axis Up

166 Student Guide SIPLACE D-Series (FSE)

9.3.2

9.3.2 Z Axis Up

Z Axis Up

9.3.2.1

9.3.2.1 Detailed Standard Pickup Procedure: Z-Axis Up

Detailed Standard Pickup Procedure: Z-Axis Up

9.3.2.2

9.3.2.2 Special Mode Pickup with "Reduced Speed" Z-axis Upwards

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.

Detailed pickup procedure: Z-axis up

LB down switches:

▪ End position signal for Z-axis down and valve drive

"ON" for vacuum

▪ Both actions completed?

▪ Start signal for upwards movement

Z-axis starts:

▪ Positioning of Z-axis upwards

LB up switches:

▪ Reset the LB down signal

▪ 1. vacuum query "Component picked up?"

▪ (reply OK) start release for gantry axes

Communication with the changeover table:

▪ "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 release for star axis

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 po-

sition 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 accelera-

tion). 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 feed-

ers (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

9 C&P Placement Heads

9.3.2 Z Axis Up 9.3 Travel Profile - Pickup

Student Guide SIPLACE D-Series (FSE) 167

9.3.2.3

9.3.2.3 Benefits of the Special Mode "Slow Speed Upwards" and "Creep Speed Start"

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 pro-

cedure.

▪ 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.

CAUTION

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.

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