00195372-0102_AI_Vakuumpumpe_D1D2_DE EN - 第42页
2 Assembly instructi ons for vacuum pump D1 / D2 11/2006 Edition 42 : Carry out a vacuum me asurement in the hold ing circuit. Fig. 2.9.2 Example: Measurement holdin g ci rcuit (note: only with closed nozzles) 2 2 2 2 2 …
D1 / D2 2 Assembly instructions for vacuum pump
11/2006 Edition
41
2.9 Finishing Work
2.9.1 Conditions for the power-on procedure
2
Before the power-on procedure the following examinations must be carried out, in order to prevent
the risk of injury or a larger damage to the equipment: 2
Ensure before restarting the com
pressed air, that 2
– all hose connectors/ - connections ar
e correctly assigned (thus also no compressed air gets
into the pressure tubing)
– all of the conditions for the switching on
of the vacuum pump and the attached mounting ma-
chines are kept, as indicated in the manuals
– The vacuum pump should always be switched on before the placement machine.
2.9.2 Checking the system for pressure tightness
2.9.2.1 Measuring with SITEST
(Checking as an example one of the component heads)
This test checks whether everything is correctly mounted. 2
Fig. 2.9.1 SITEST Head Function
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2
2
2
2 Assembly instructions for vacuum pump D1 / D2
11/2006 Edition
42
: Carry out a vacuum measurement in the holding circuit.
Fig. 2.9.2 Example: Measurement holding circuit (note: only with closed nozzles)
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D1 / D2 2 Assembly instructions for vacuum pump
11/2006 Edition
43
: Carry out the function vacuum test.
The holding circuit vacuum test with closed nozzles can identify - contrary to when open - a devi-
ating value, if the vacuum plate exhibits an offset. Therefore, it is worthwhile carrying out the mea-
surement of the head and of the vacuum distribu
tor with the same measuring instrument. 2
The measured value must be nearly alike at all component heads and at the vacuum distribution
bloc
k. 2
Should more than a slight difference be given, then measure the vacuum with the
same portable
measuring instrument that you used for the vacuum distribution blocks also at all component
heads (to exclude possible offset fluctuations between the measuring plates). If a difference is
thereby identified, the leakage must be found and sealed. 2
Fig. 2.9.3 Example vacuum pickup circuit: listed measured values of all segments (closed with open and nozzles)