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Services to the machine Pneumatic System Vacuum Generation at C&P Heads - General Information S tudent Guide SIPLACE D4 (FSE) Services to t he machine EN 09/2006 136 6.3 Pneumatic System 6.3.1 V acuum Generation at C…
Services to the machine
Various Signals Power Supply Unit
Student Guide SIPLACE D4 (FSE)
EN 09/2006 Services to the machine
135
6.2.16 Various Signals
6.2.16.1 Software Release (Software Enabled)
6.2 - 12: Software release signal
The software release signal is emitted by the CAN I/O card, as soon as the MC has finished booting and
the start button has been pressed. Communication also needs to be established to the Vision system,
the axis controllers, the CAN bus and the stations/line computers (except in stand-alone mode). Once
the start button is pressed, the 24 V output signal is sent via the CAN I/O module to SZ24, contact A1.
If the emergency stop circuit is broken, the software release will not be given.
6.2.16.2 Safety Loop OK signal
The message
Safety loop OK
will be emitted by
the CAN I/O module, if the following conditions
have been fulfilled:
All covers closed
All component tables connected
All emergency stop buttons released
The emergency stop circuit is closed
Services to the machine
Pneumatic System Vacuum Generation at C&P Heads - General Information
Student Guide SIPLACE D4 (FSE)
Services to the machine EN 09/2006
136
6.3 Pneumatic System
6.3.1 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 illustrateswhat
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.
Services to the machine
Overview Pneumatic System Pneumatic System
Student Guide SIPLACE D4 (FSE)
EN 09/2006 Services to the machine
137
6.3.2 Overview Pneumatic System
6.3 - 1: Pneumatic overview