0197787-01_UM_HeadVerification_708_EN.pdf - 第52页

SIPLACE Head V erification User Manual Edition 01/2015 52 Point 4: W e can see here how the "Z down de lta place [m s]" value is calculated us ing the two thresh old values "Z min place [m s]" and &qu…

SIPLACE Head Verification

User Manual Edition 01/2015

4.8.3 Explanation of Measurement Results Using Results PDF

These results can be seen if you scroll down the "Summary" menu or generate a results PDF!

Figure 34: Results PDF for head endurance run LS_1

Figure 35: Results PDF for head endurance run LS_2

Point 1:

The "Z down pick min/max" and "Z down place min/max" diagrams, plus the corresponding

measurements in the table, indicate that segment 6 deviates from all other segments both during

pickup and during placement! During both movements, this segment was not able to move as far

downwards as the other segments.

This might be due to difficulty moving the segment linear guide, to a defective cover switching ring

causing the light barrier to switch earlier or to the light barrier window in the CPP segment being dirty.

Point 2:

The "Z down pick min/max" and "Z down place min/max" diagrams, plus the corresponding

measurements in the table, indicate that segments 1 and 2 deviate significantly between pickup and

placement. The Z axis does not move as far downwards during pickup as it does during placement.

One possible cause could be that the DP linear guide have difficulty moving and that the segment or

DP linear guide may soon need replacing.

Point 3:

We can see here how the "Z down delta pick [ms]" value is calculated using the two threshold values

"Z min pick [ms]" and "Z max pick [max]". A value which is leaning towards the upper threshold (in this

example 150µm), indicates a problem with the linear guide for that segment.

SIPLACE Head Verification

User Manual Edition 01/2015

Point 4:

We can see here how the "Z down delta place [ms]" value is calculated using the two threshold values

"Z min place [ms]" and "Z max place [max]". A value which is leaning towards the upper threshold (in

this example 150µm), indicates a problem with the linear guide for that segment.

4.8.4 Meaning of the Results

"Z down delta pick [µm]" and "Z down delta place [µm]" errors at all segments:

1. Z motor defective  Replace Z motor

2. Z motor linear guide has difficulty moving  Replace Z motor

3. Read unit of Z motor is dirty  Clean the read unit

4. Light barrier Z down dirty/defective  Clean/replace the light barrier

"Z down delta pick [µm]" and "Z down delta place [µm]" errors at individual segments:

1. DP linear guide has difficulty moving  Replace DP

2. Linear guide for segment has difficulty moving  Replace linear guide for segment

3. Cover switching ring defective or incorrectly fitted  Replace cover switching ring

4. Light barrier in segment dirty  Clean light barrier through window

"Min DP time [ms]" or "Max DP time [ms]" errors at individual segments:

1. Internal DP/segment problem  Replace DP/segment

4.9 "Segment Offset Up & Down (Fast)" Measurement

The following tools are required for these measurements:

CPP: 12x nozzle type 2057 03070280-01 (calibration nozzle)

CP20P: 20x nozzle type 4235 03098748-01 (calibration nozzle)

CP20A: 20x nozzle type 1235 03015222-01 (calibration nozzle)

1x calibration component CPP 03010565-01

1x calibration component C&P20A/P 03034148-01

4.9.1 Explanation of Measurement – Procedure

The "Segment offset up & down (fast)" measurement is a quick test to determined how far outside its

rotation axis a segment is. If this measurement shows that a segment is outside the tolerance

threshold, meaning that it is badly deformed, all subsequent measurements will be terminated, as the

head is no longer able to produce (due to this segment.)The segment must be immediately replaced,

before other measurements can be performed.

This eccentricity of the segment center to the middle of the camera is known as the segment

offset.The "segment offset up" describes the rotation (offset) of the segment in docked state to the

component camera. The "segment offset down" describes the rotation of the segment in the bottom

position. This position then illustrates the eccentricity of the segment axis in the pickup or placement

position, meaning the offset between the component and PCB camera. This measurement is important

and enables the machine to calculate this displacement into the target positions during pickup and

placement, thereby increasing the pickup or placement accuracy.The "Segment offset up & down

(fast)" measurement is performed for each segment at an angle of 0°, in the top or bottom position and

provides a quick idea of the rough segment offset, so that additional measurements to establish a

defective segment are not always needed.

The results of these measurements provide feedback about the following sources of errors:

1. Deformed segments

2. Defective Z linear guides for DP / segments (worn out / loose)

SIPLACE Head Verification

User Manual Edition 01/2015

Measurement steps:

1. Firstly, the exact position of the calibration component in the calibration bag is determined with

the PCB camera, as the actual position (the exact center and position), and is then adopted as

the pickup position. This center is determined using 4 points at the corners of the calibration

component.

2. Segment 1 now moves downwards at an angle of 0° and picks the calibration component up

from the pickup position determined (calibration component center).

3. Segment 1 is moved upwards again.

4. Segment 1 is rotated by the star over the component camera.

5. The component camera measures the four calibration component structure fiducials to

determine the exact position of the calibration component to the camera center, thereby

optically centering the calibration component.The offset values determined here are saved as

Up X [µm] and Up Y [µm]. This value now describes the eccentricity of the calibration

component to the camera center.This value provides the "Segment offset up" for segment 1 at

0°, as we can assume that segment 1 picked up the calibration component exactly in the

center. The offset values determined are calculated into the following placement (putdown) of

the calibration component (calibration bag) as correction values.

6. The star now rotates the segment with the calibration component back into the placement

position.

7. Segment 1 and the Z axis are moved downwards and the calibration component is placed in

the calibration bag at an angle of 0° (DP/segment angle) and with the corrected offset values

Up X [µm] and Up Y [µm], as a placement position.

8. The PCB camera now moves over the calibration component and once more determines the

four points in the calibration component corners, to find the exact position of the calibration

component in the bag. This provides the offset values Down X [µm] and Down Y [µm], which

describe the eccentricity of the calibration component to the PCB camera center. This value

describes exactly the offset of the segment 1 center at a placement angle of 0°, when

segment 1 is in the placement position. This provides the exact displacement of segment 1 at

a placement angle of 0°, describing how much the Z linear guide has changed the segment

position at the top to the segment position at the bottom.This deviation also describes the

offset of the component camera to the PCB camera for this segment.

9. The values determined for segment 1 Down X [µm] and Down Y [µm] are taken as an

absolute 0 for all other calculations of all segment offsets. The "Segment offset down" for

segment 1 is the reference value as all other offsets for all other segments refer to this initial

value.

10. The calibration component position determined is now used again as actual pickup position for

the following measurement.

11. Segment 2 now picks up at 0°.

12. Steps 2-10 are performed for all segments.

13. The calibration component stays in its position at 0° for the entire measurement and does not

change its angle!