0197787-01_UM_HeadVerification_708_EN.pdf - 第41页
SIPLACE Head V erification User Manual Edition 01/2015 41 problem is.T he dispersion should be as s mall as poss ible, as this shows a cons tant vacuum behavior across the 360°. Delta vac. 0-270 ° [mbar] = max. Vacuum 0°…
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Figure 26: Air & vacuum with head sensors 3 result
Legend:
1. Segment measured
2. Value determined Vacuum open [mbar]
This value is determined when the Z axis moves downwards with the travel profile TP5 and
while the vacuum is measured at the open nozzle. This value must be within a plausible
tolerance (in this case for the CPP head with nozzle 2057 -800…400mbar).
3. Value determined Vacuum closed [mbar]
This value is determined when the Z axis meets the component (in this measurement at the
height reference run position), the light barrier Z-down end position signal has been emitted
and the nozzle is understood to be closed. This is an absolute value and must not be within a
tolerance!
4. The Vacuum delta [mbar] value is calculated by finding the difference between the Vacuum
closed [mbar] (3) values and the Vacuum open [mbar] (2) value. Since the threshold value
for Vacuum open [mbar] is prescribed by the head and nozzle type parameters and the
Vacuum closed [mbar] value is an actual vacuum value at the closed nozzle during pickup,
the Vacuum delta [mbar] value is also within a defined tolerance.
(in this case for CPP head with nozzle 2057 230…450mbar).
Vacuum delta [mbar] = Vacuum closed [mbar] – Vacuum open [mbar]
5. The Open dev. [mbar] will not be explained further and is not currently used for the head
verification.
6. The Holding (nozzle open) [mbar] describes the value measured at the vacuum present at
an open nozzle during rotation of the complete holding circuit.
This value depends on the use of a vacuum pump and must also be within a plausible
tolerance.
(in this case for CPP head with nozzle 2057 -120..-40mbar)
7. This shows the vacuum values determined for the closed nozzle during simulated pickup
(either calibration component or height reference run plate) at the moment of light barrier Z-
down action (end position signal) in the pickup angles 0°, 90°, 180° and 270°. These "Vacuum
0°"-"Vacuum 270°" values provide an overview of the vacuum at different pickup and
placement angles.
8. The Delta vac. 0-270° [mbar] value is calculated by finding the difference between the lowest
and highest values from the "Vacuum 0°"-"Vacuum 270°" (7) measurement.
If this value is exceptionally high, compared to other segments, this indicates that the segment
has a problem at one of the angles. The angle overview (7) helps you to identify where the
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problem is.The dispersion should be as small as possible, as this shows a constant vacuum
behavior across the 360°.
Delta vac. 0-270° [mbar] = max. Vacuum 0°-270° [mbar] - min. Vacuum 0°-270° [mbar]
9. During calibration component pickup, the Vacuum calib part [mbar] value is used as a
reference value for the vacuum at closed nozzle pickup. The value must be within a tolerance
of -950..-770mbar.
10. The Delta calib-closed [mbar] is calculated by finding the difference between the Vacuum
Calib part [mbar] (9) and the Vacuum closed [mbar] (3) values. This value is used as a
comparative value to check whether the vacuum value during pickup is correct and whether
the system is working reliably.
Delta calib-closed [mbar] = Vacuum calib part [mbar] (9) – Vacuum closed [mbar] (3)
11. The Calib part dev. [mbar] value describes how reliably the vacuum is reduced at the nozzle.
12. The Air [mbar] measurement checks the air blast pressure which is actually at the open
nozzle when the gripper is switched on with 200 mbar blast pressure.
The value must be within a tolerance of 140..220mbar.
13. After switching off the air blast, the pressure is measured again at the nozzle tip. This value
Vacuum zero [mbar] shows how the air blast pressure has been reduced at the nozzle tip.
14. Results display (OK green tick / NOK red X)
15. This diagram illustrates the "Vacuum open [mbar]" values for the segments.
Blue line Vacuum open [mbar]
Red border Min and max tolerances (in our case -680..-400mbar)
Use the button to zoom in on the diagram.
16. This diagram illustrates the "Vacuum delta [mbar]" values for the segments.
Blue line Vacuum delta [mbar]
Red border Min and max tolerances (in our case 100..220mbar)
Use the button to zoom in on the diagram.
17. This diagram illustrates the "Holding open [mbar]" values for the segments.
Blue line Holding (open) [mbar]
Red border Min and max tolerances (in our case -180..-60mbar)
Use the button to zoom in on the diagram.
18. This diagram illustrates the "Vacuum calib part [mbar]" values for the segments.
Blue line Vacuum calib part [mbar]
Red border Min and max tolerances (in our case -900..-680mbar)
Use the button to zoom in on the diagram.
19. This diagram illustrates the "Air [mbar]" values for the segments.
Blue line Air [mbar]
Red border Min and max tolerances (in our case 190..250mbar)
Use the button to zoom in on the diagram.
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4.6.3 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 27: Results PDF for air & vacuum with head sensors
The "Vacuum delta [mbar]" (1) value is calculated by finding the difference between the "Vacuum
closed [mbar]" and "Vacuum open [mbar]" values.
In our example, we have the following calculation for segment 1:
Vacuum delta [mbar] = Vacuum open [mbar] – Vacuum closed [mbar]
Vacuum delta [mbar] = -518mbar – (-840mbar) = 322mbar
If the "Vacuum open [mbar]" is already under the tolerance threshold of -400mbar, this indicates that
the vacuum cycle for the segment is leaky. This means that, despite the nozzle opening - which
permits a certain drop in vacuum, the vacuum cycle for the segment after the nozzle must be
damaged as it is unable to form a reliable vacuum in accordance with system requirements.
If the "Vacuum open [mbar]" values is above the tolerance threshold of -800mbar, this would indicate
that the system is blocked. Either the nozzle is closed or a hose has been folded over or blocked.
The "Vacuum closed [mbar]" value describes the vacuum at a covered nozzle (simulated
component).If this value is under the upper tolerance threshold for the "Vacuum open [mbar]" value of
-800mbar, this indicates that the nozzle has not been reliably covered.
The "Delta vac. 0-270° [mbar]" (2) value is calculated from the maximum dispersion of vacuum values
at the segment angles "Vacuum 0°" - "Vacuum 270°".
In our example, segment 5 shows the greatest difference between
"Vacuum 0°" = -834mbar and "Vacuum 180°" =-866mbar.
We therefore have the following calculation for the "Delta vac. 0-270°" value:
Delta vac. 0-270° [mbar] = Min – Max = -834mbar – (-866mbar) = 32mbar
If the dispersion is too great, this indicates that the rotary axis of the segment is damaged and
therefore running eccentrically, so that the nozzle is therefore unable to make level contact with the
component.
In this case we need to look for a significant deviation in one of the values.
The "Delta calib-closed [mbar]" (3) value is calculated by finding the difference between the "Vacuum
closed [mbar]" and the "Vacuum calib part [mbar]" values.
In our example, we have the following calculation for segment 9:
Delta calib-closed [mbar] = Vacuum calib part [mbar] – Vacuum closed [mbar]
Delta calib-closed [mbar] = -845mbar – (-832mbar) = -13mbar
You can establish the degree to which there are differences between the reference run vacuum and
the vacuum on component pickup.