00195372-0102_AI_Vakuumpumpe_D1D2_DE EN - 第43页
D1 / D2 2 Assembly instructions for vacuum pump 11/2006 Edition 43 : Carry out the function vacuum test. The holding circuit vacu um test with closed nozzles ca n identify - contrary to when open - a d evi - ating value,…
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)
2 Assembly instructions for vacuum pump D1 / D2
11/2006 Edition
44
2.9.2.2 Measure the vacuum with an external pressure measurement instrument:
– at the measuring connection of the vacuum distribution blocks entrance (see Fig. 2.9.4) and
afterwards
– at an open nozzle in the holding circuit of the placement head (see Fig. 2.9.5). All other
nozzles must be closed.
Pressure may amount to max. 20-30 mbar! Otherwise everything is not sealed. 2
Fig. 2.9.4 Measurement of the vacuum distribution block (machine entrance)
: Remove for the plugs from the measuring connection at the vacuum distribution block.
: Attach the external measuring instrument.
: Switch the vacuum pump on.
: Open if necessary the inserted vacuum shut-off valves
: Open the compressed air shut-off valves.
: Switch the main switch on.