D-serie LEVEL II - 第78页
Energy and Compressed Air Supply Pneumatic System Vacuum Generation at C&P Heads - General Information S tuden t Guide Advanced Level 2 SIPLACE D Series Energy and Compressed A ir Supply EN 05/2007 5-12 5.3 Pneumatic…
Energy and Compressed Air Supply
Power Supply for Axis Unit Power Supply Unit
Student Guide Advanced Level 2 SIPLACE D Series
EN 05/2007 Energy and Compressed Air Supply
5-11
5.2.10 Power Supply for Axis Unit
5-7: Power supply for axis unit (new version)
After activating the main switch, the axis unit is
supplied with power from the main power supply,
via X8 for axis unit 1 and X9 for axis unit 2. It is
supplied with 48 VDC and the following voltages
are generated:
+/-15 V and +/-15/5 V
This DC/DC converter generates the 5V and +/-
15V needed for the servo board and the axis
controller
5-8: Power supply for axis unit (old version)
Energy and Compressed Air Supply
Pneumatic System Vacuum Generation at C&P Heads - General Information
Student Guide Advanced Level 2 SIPLACE D Series
Energy and Compressed Air Supply EN 05/2007
5-12
5.3 Pneumatic System
5.3.1 Vacuum Generation at C&P Heads - General Information
The air is supplied to the vacuum generator, which produces a vacuum using the venturi principle.
The venturi block actually consists of 2 separate venturi nozzles which produce vacuum for 2 circuits,
the holding circuit and the pick up / placement circuit.
The level of vacuum produced is dependent on a number of factors. The greatest influence on vacuum
generation is from the Venturi unit. Any leakage from or blockage within the system will result in working
inefficiently and therefore a reduction in the vacuum levels created. The Venturi unit must be absolutely
airtight and the nozzles in very good condition and of high quality.
One factor which can impair vacuum generation is the altitude. The higher above sea level a machine is
located, the low the ambient pressure will be in the room surrounding it. Therefore at high altitude low
vacuum levels are created, A SIPLACE machine in Munich, at an altitude of 500 m above sea level, can
generate a closed vacuum of approx. 870 mbar, while a machine at sea level in England would be able
to produce approx. 920 mbar.
Another factor influencing the vacuum values is the weather. Stormy, rainy days occur in periods of low
pressure. Vacuum generation during this weather may produce 880 mbar, while the same procedure a
week later, on a sunny day in a high pressure period, could well produce closed vacuum results of 900
mbar.
These 2 cases are only examples and no specific case / figures are used, but this just illustrates what
can happen. In any case, it is important that you use an efficient, high quality vacuum system.
The vacuum measurement board is located directly above the vacuum generator and measures the
vacuum values in the hold and pickup/placement circuits. Small tubes are attached to the back of the
Collect & Place head that measure the circuit pressures at the vacuum distributor. These tubes are
connected to pressure sensors. The analogue outputs of these sensors are supplied to A/D converters.
The resulting signals are then sent via the CAN-Bus to the machine controller.
Energy and Compressed Air Supply
Overview Pneumatic System Pneumatic System
Student Guide Advanced Level 2 SIPLACE D Series
EN 05/2007 Energy and Compressed Air Supply
5-13
5.3.2 Overview Pneumatic System
5-9: Overview of pneumatic system/compressed air supply (D4)