00195372-0102_AI_Vakuumpumpe_D1D2_DE EN - 第47页
D1 / D2 2 Assembly instructions for vacuum pump 11/2006 Edition 47 Fig. 2.9.7 4 gantr y with C&P12: compare the pressure drop at 1, 2, 3... open nozzles 2 Relative Vacuum [mbar] Number of open nozzles Vacuum curve fo…
2 Assembly instructions for vacuum pump D1 / D2
11/2006 Edition
46
2.9.2.3 Checking the holding circuit of the vacuum system
The flow can be controlled “indirectly “over the vacuum characteristic. 2
Proceed as follows: 2
: Re
move the nozzles from the placement head (in order to allow maximum flow.
: Ope
n sequentially in the SITEST the segment in fetching position and turn it by means of as-
terisking into the holding circuit.
The vacuum measurement in the holding circuit sh
ows
with every additionally opened nozzle a
vacuum waste of approx. 60-90 mbar. 2
2
With six opened nozzles the vacuum could for example drop from -880 mbar to -520 mbar.
With six C&P heads on two mounting machines with a common vacuum pump, the decrease of
pressu
re is larger; with only one placement machine smaller (four or two C&P heads). 2
2.9.2.4 Vacuum Characteristics
The following diagrams also apply to the D1 and D2 (provided with other mounting equipment) 2
Fig. 2.9.6 C&P6 (red) and C&P12 (blue): Pressure drop at 1, 2, 3... open nozzles
Vacuum [mbar]
Number of open nozzles
Gantry 1
Gantry 2
Vacuum curve for S27HM with ELMO 2BL 1 1000 vacuum pump and 720 nozzles
Gantry 1: 6-segment head / Gantry 2: 12-segment head
D1 / D2 2 Assembly instructions for vacuum pump
11/2006 Edition
47
Fig. 2.9.7 4 gantry with C&P12: compare the pressure drop at 1, 2, 3... open nozzles
2
Relative Vacuum [mbar]
Number of open nozzles
Vacuum curve for HS60 with ELMO 2BL 1 1000 vacuum pump and 914 nozzles
12-seg. head, gantry 1
12-seg. head, gantry 2
12-seg. head, gantry 3
12-seg. head, gantry 4
2 Assembly instructions for vacuum pump D1 / D2
11/2006 Edition
48