00198168-02_Technical_Training_TX-Series_EN.pdf - 第67页
5 Placement Heads 5.1 CPP Head Technical Training SIPLACE TX-Series 10/2016 67 Pickup and Placement Circuit ● Before the star rotates into the pickup position, the relevant valve is switched on via the valve terminal. ● …
5 Placement Heads
5.1 CPP Head
66 Technical Training SIPLACE TX-Series 10/2016
5.1.4 Vacuum System Overview
5.1.4.1 Vacuum System Function Overview
The Vacuum consists of two main parts:
●
Pickup/placement circuit: supply vacuum to pickup component from feeder or air kiss to place
it onto PCB.
●
Holding circuit: holding the component on the nozzle when component is on nozzle but not in
pickup position.
1. Retract Unit Z Axis
2. PRV
3. Silencer
4. Holding Circuit
5. Star frame with DP drives
6. Valve board
7. Distributor disk
8. Rear cover Head
9. Holding Circuit Sensor
●
The pneumatic distributor supplies the PRV (2), the holding circuit (4) and the retract unit (1)
with 4.5bar compressed air.
●
The compressed air is fed directly through the holding circuit (4) to the valve terminal (6).
There it is distributed into 12 channels, each channel has it own pneumatic valve, which can
open and close this channel.
●
The compressed air is fed from the valve terminal to the holding circuit (4). The vacuum for
the holding circuit of all 12 segments is generated there via 12 venturi nozzles.
●
The vacuum is fed from the holding circuit via the star frame (5) to the nozzle.
5 Placement Heads
5.1 CPP Head
Technical Training SIPLACE TX-Series 10/2016 67
Pickup and Placement Circuit
●
Before the star rotates into the pickup position, the relevant valve is switched on via the valve
terminal.
●
Vacuum from the holding circuit is now present at the nozzle.
●
Once the star has reached the pickup position, the holding circuit vacuum is strengthened via
the PRV and the component can be picked up.
●
After the component has been picked up, the component is held on the nozzle with the
holding circuit.
●
Once in the placement position and the Z down sensor is enabled, the PRV will switch over to
air blast. This eliminates the holding circuit vacuum and an air blast of approx. 200mbar is
present at the nozzle.
5 Placement Heads
5.1 CPP Head
68 Technical Training SIPLACE TX-Series 10/2016
5.1.4.2 GUI – How to perform a vacuum check
In the case of vacuum errors the vacuum system can be tested using the station software.
For the pickup/placement circuit the differences between open and closed values are evaluated,
For the holding circuit the absolute value is measured.
1. Check Vacuum values tab
2. Nozzle vacuum detailed results
3. Nozzle vacuum check status
4. Head function menus
5. Click Measure vacuum values to start new check.
When vacuum results are bad the segment/segments affected are highlighted.
Example: Error occurs on segment 3.