00196101-04_Serviceanleitung Vakuumtest 08-2018_D-E.pdf - 第76页

Service manual vacuum check with closed nozzles Page 76 fr om 136 4.2.2 Venturi - / Vacuum pump – S y stem: Basicall y all m entioned C & P20x - head t ypes can be operated w ith Ventur i nozzle , as well as with vac…

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Service manual vacuum check with closed nozzles
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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).
Service manual vacuum check with closed nozzles
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4.2.2 Venturi- / Vacuum pump – System:
Basically all mentioned C & P20x - head types can be operated with Venturi nozzle, as well as
with vacuum pump. For each a corresponding conversion kit is offered.
For heads operated with a vacuum pump, the vacuum values for the values "open", "closed" and
"holding circuit" are expected to be around 30-70mbar lower.
C&P20 / C&P20a / C&P20m – heads are predominantly found with Venturi system,
C&P20p / C&P20m2 – heads are mostly available with a vacuum pump.
For C&P20 / C&P20a / C&P20m – heads, the vacuum for the holding circuit is measured at
position 12.
For C&P20p / C&P20m2 – heads the vacuum for the holding circuit is measured at position 11.
NOTE
Vacuum with Venturi nozzles in the holding circuit
In a venturi nozzle system, the vacuum in the holding circuit is generated separately for each
individual segment with venturi nozzles.
In case of use ot a vacuum pump, the vacuum is supplied jointly to all segments on the head
directly from the main connection.
Service manual vacuum check with closed nozzles
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4.2.3 Vacuum test with normal nozzles (calibration nozzle)
The vacuum tests in the station software for CP 20 heads check the following:
1. open / closed (Pos. B) - measurement is made from the nozzle tip to the pressure control valve.
Vacuum values = pressure control valve + holding circuit
2. holding circuit (Pos. C) - measurement is made from the nozzle tip to the holding circuit sensor.
Vacuum value = holding circuit
Figure 4-6
Figure 4-7
Schematic representation of the
Vacuum-/ air kiss principle, at the
example of a C&P20p - head with
vacuum pump operation. (pick up)
Schematic representation of the
vacuum-/ air kiss principle, at the
example of a C&P20a - head with
venturi-nozzle operation. (pick up)