00196101-04_Serviceanleitung Vakuumtest 08-2018_D-E.pdf - 第74页

Service manual vacuum check with closed nozzles Page 74 fr om 136 Vacuum values and v alve plunger positions Figure 4-5 : shematic represent ation plunger function • If the valve plu nger is i n position " nozzle op…

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Service manual vacuum check with closed nozzles
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Scenario 1
Figure 4-3: measurement sample, open value incorrect
Example for faulty vacuum values, which can be caused by a damaged suction plate,
at segment 2.
Scenario 2
Figure 4-4: measurement with closed nozzles - nominal
Example for faulty vacuum values which indicate a damaged silicone hose at segment 1 and an
open nozzle at segment 3.
NOTE
Several damaged suction plate
If both measurement values for a segment are around 640 mbar the suction plate could be
destroyed.
NOTE
Faulty silicone hoses
Under certain conditions faulty silicone hoses can only be detected if the segments are extended.
In that case it is recommended to switch of the servo controller for the Z axis in order to perform
the vacuum check in lowest position by single measurement.
HINWEIS
Missing valve plunger
If both measurement values for a segment are around only 210mbar it indicates a missing valve
plunger.
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Vacuum values and valve plunger positions
Figure 4-5: shematic representation plunger function
• If the valve plunger is in position "nozzle open" the vacuum area is sealed by two seal
rings against the atmosphere.
• If the valve plunger is in position "nozzle closed" the vacuum area is sealed by only one
seal ring (at the rear next to the motor).
• If the vacuum value "closed" is too low these seal rings could be insufficiently greased or
damaged
Recommendations for maintenance:
• Use ONLY greased valve plungers. (Isoflex topas).
• Exchanging valve plungers means:
- Clean the body of the valve plunger! Otherwise the good plungers with new grease are
contaminated by the dirty housing.
- For greasing the valve plunger use maintenance tool item no. [03049689-01].
- Perform vacuum checks, using the closed (red) „Nozzle type 769 vacuum test DLM“
[03067029-01].
• Check regularly the suction plate "blue" (from 10/2008 "white") and replace it (with 1.5 mm
allen key).
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4.2 On C&P20x heads
Damage or soiling on the holding circuit, the silicone hoses, the filter disks or the nozzles can
lead to leaks or blockages, which can result in malfunctions in the placement process or reduce
the vacuum value in the holding circuit resp. placement circuit.
4.2.1 Different head types / generations
The vacuum tests described below are generally identical across the following types /
generations.
C&P20 / C&P20a / C&P20m / C&P20p / C&P20m2
For C&P20p and C&P20m2 heads, the holding circuit achieves approx. 20mbar higher vacuum
levels.
Table with reference values:
Vacuum value with
calibration nozzle
open
closed
Holding circuit
1235
ca. -600 mbar
ca. -850 mbar
-100 to -110 mbar
1235
ca. -600 mbar
ca. -850 mbar
-80 to -85 mbar
1235
ca. -600 mbar
ca. -850 mbar
-100 to -110 mbar
1235
ca. -600 mbar
ca. -850 mbar
-80 to -85 mbar
4235
ca. -600 mbar
ca. -850 mbar
-125 to -135 mbar
4235
ca. -580 mbar
ca. -780 mbar
-50 to -55 mbar
Table 4-1: Reference values C&P20 heads
(depending on the altitude, the higher the location the smaller the values).