00197787-02_SI_SIPLACE_HeadVerification_EN - 第74页

6 Description of the test results 6.19 Segment offset up & down (fast) 74 Software Manual SIPLACE Head Verification 03/2018 13 Table showing an overview of the largest and smallest value determined: ● UpX = UpX max…

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6 Description of the test results
6.19 Segment offset up & down (fast)
Software Manual SIPLACE Head Verification 03/2018 73
6.19.2 Measurement result
Fig.53: Result view – Segment offset up and down (fast)
1 Measured Segment
2 Calculated Segmentoffsetup value "UpX":
UpX
Segment (1)
is used as the reference to calculate the other segment offsets.
UpX
Segment (n)
= UpX
Segment (1)
+ dxUp
Segment (n)
– dxUp
Segment (1)
3 Calculated Segmentoffsetup value "UpY":
The calculation follows the same principle as for UpX.
4 Calculated Segmentoffsetdown value "DownX":
DownX
Segment (1)
= 0 and is used as the reference to calculate the other segment offsets:
DownX
Segment (n)
= dxDown
Segment (n)
– dxDown
Segment (1)
5 Calculated Segmentoffsetdown value "DownY":
The calculation follows the same principle as for DownX.
6 Result view indicating if the values are within (green tick) or outside (red cross) the limits.
7 Measured Segmentoffsetup value “dxUp”.
8 Measured Segmentoffsetup value “dyUp”.
9 Measured Segmentoffsetdown value “dxDown”.
10 Measured Segmentoffsetdown value “dyDown”.
11 Graph showing the calculated Segmentoffsetup values "Up X" and "Up Y".
12 Graph showing the calculated Segmentoffsetdown values "DownX" and "DownY".
6 Description of the test results
6.19 Segment offset up & down (fast)
74 Software Manual SIPLACE Head Verification 03/2018
13 Table showing an overview of the largest and smallest value determined:
●
UpX = UpX
max
– UPX
min
●
UpY = UpY
max
– UPY
min
●
DownX = DownX
max
– DownX
min
●
DownY = DownY
max
– DownY
min
6.19.3 Interpretation of the results obtained
‘Up X’ and ‘Up Y’ error for all segments:
Cause Solution
Incorrect Zero point correction of the star. ► Check the zero point correction of the star.
‘Down X’ and ‘Down Y’ error for all segments:
Cause Solution
Linear bearing of the Z-axis loose or defective. ► Check / replace the Z-axis.
‘Up X’, ‘Up Y’, ‘Down X’ and ‘Down Y’ error for individual segments:
Cause Solution
Segment bent, possibly after crash. ► Replace the segment (DP).
Linear bearing of segment defective ► Replace the linear bearing (DP).
6 Description of the test results
6.20 Segment offset up & down
Software Manual SIPLACE Head Verification 03/2018 75
6.20 Segment offset up & down
6.20.1 Measurement principle
The Segment offset up & down measurement checks the degree to which a segment is outside
of its rotation axis. This eccentricity is also known as segment offset.
●
While "segment offset up" measures the rotation (offset) of the segment in the docked state
(Z-axis up), "segment offset down" measures the rotation of the segment in the bottom posi-
tion (Z-axis down).
●
The positions, therefore, illustrate the eccentricity of the segment axis in the pickup or place-
ment position, also referred to as offset between the component and PCB camera.
The measurement is performed for each segment in the top or bottom position at four angles (0°,
90°, 180° and 270°) to determine the exact rotation and to calculate the influence of the Z-axis lin-
ear guide between the segment top and segment bottom positions.
NOTICE
Segment no longer suitable for placement
The measurement is a prerequisite for the placement accuracy of the machine as the de-
termined values are used to calculate the actual placement position. The specified limits fol-
low the construction and production tolerances which can be compensated by the software.
If the segment offset exceeds the limits, the segment has most likely been deformed mech-
anically and is no longer suitable for accurate placement.
► Replace the segment before performing other measurements.
The measurement provides feedback about the following parts:
●
Deformed segments (DP / linear guide)
●
Defective Z-axis linear guides