00193794-11_VD_SSW 505.05_de en.pdf - 第59页
Software Version Description, Station Software 505.05 07/2008 Edition 5.35 Check of the holding-circuit vacuum If the holding-circuit vacuum is too low, the com ponents can slip out of position on the nozzle, thus reduci…
Software Version Description, Station Software 505.05 07/2008 Edition
5.34 Cage resetting for THK guide
High-Force TwinHeads are equipped with a THK ball spline. For this guide type a cage resetting is
necessary after a certain cycle number. This resetting is perfomed by applying a certain force. The
force required for resetting the cage is reached when a nozzle is returned. In other words, every
time a nozzle is returned, the ball cage is reset.
If there is no nozzle change (and thus no cage resetting perfomed) after a certain number of
placement cycles, there is an additional nozzle change during PCB change.
5.34.1 Requirements
- Cage resetting is only carried out for the Twin Head.
- The cage can be reset for each segment independently.
- The number of placement cycles after the cage is reset is variable and is stored in the machine
database. Default value: 1000 placement cycles.
- Cage resetting can be activated/deactivated via the database; by default, it is activated.
- The cage can only be reset at a PCB change.
Reason: The processing of the PCB must not be interrupted by cage resetting for performance
reasons.
- A nozzle change or the returning of a nozzle counts as cage resetting.
Reason: The force required to reset the cage is obtained when the nozzle is removed from the
segment.
- If cage resetting could not be performed, the warning "Placement force could not be calibrated"
is displayed on the GUI.
5.34.2 Restrictions
- The customer must ensure that a nozzle changer (Twin) is configured and completely
calibrated.
- A cage reset is not carried out before or during the following processes:
- Calibration and mapping processes (SITEST)
- In the component shape manipulator (component testing)
- The counter is not incremented during these processes.
- The software draws no distinction between standard nozzles, special nozzles and grippers. It is
assumed that all of them can be changed automatically.
- A manual nozzle change, in which the operator removes the nozzle from the segment by hand,
is not considered to be a cage reset.
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Software Version Description, Station Software 505.05 07/2008 Edition
5.35 Check of the holding-circuit vacuum
If the holding-circuit vacuum is too low, the components can slip out of position on the nozzle, thus
reducing placement accuracy and reliability.
The holding-circuit vacuum is essentially influenced by 2 factors.
- The height dependency of the vacuum values:
These can be adjusted by setting the vacuum parameters in the machine database.
- The distribution of the holding-circuit values when the valve tappets are open.
5.35.1 Requirements
The distribution of the holding-circuit vacuum is monitored automatically. If there are deviations, an
error message appears as a warning.
- The measurement results for the holding-circuit vacuum are evaluated after each placement
cycle.
- Only cycles in which no open segment has corrupted the measurement result are evaluated. All
cycles in which there are error messages are omitted from the evaluation:
- during optical centering (Vision)
- if vacuum problems occur (component not on nozzle before placement)
.
- If the evaluated vacuum is too low, the existing message "258 Holding circuit vacuum too low
(specified/actual)" is issued.
5.35.2 Restrictions
The error message "258 Holding circuit vacuum too low (specified/actual)" cannot be configured by
the operator as a fatal error.
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Software Version Description, Station Software 505.05 07/2008 Edition
5.36 Ball race monitoring
Ball race monitoring detects a false position of the z axis concerning the ball race during the star
rotation. Because of a false position the ball race can be damaged sooner.
At the user interface the following error message is displayed:
"3564 Ball race monitoring activated"
If the ball race monitoring is activated, the C&P head reference run is started automatically after
finishing the board. Thereby the false position of the z axis can be adjusted.
But if the ball race monitoring is activated permanently, this indicates a permanent false position of
the z axis. This can be due to the following errors:
1. Incorrect setting of the upper z-stop
2. Incorrect setting of the p-gain of the z-servo
3. To low belt voltage of the z-axis belt
4. Defect z-axis motor (transmitter unit loose)
5. Defect servo card
6. Already damaged ball race or z-axis sliding block
7. Defect z-axis guide
In this case inform your service technician.
You can deactivate the ball race monitoring and the automatic reference run by using the machine
database. For detailed information please contact the Technical Service Center Munich.
5.36.1 Restrictions
Ball race monitoring is not supported by the machines: HF and HF/3.
Ball race monitoring is activated for the following machines only for 12-seg. C&P head: HS-60, HS-
50, HS-50+, S-27 HM, S-25 HM.
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