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1 - 10 S tudent Guide SIPLACE X 8 Collect&Place-Head 20 Edition 09/2005 10 Pickup Process: – When the Z-axis moves d ownwards, the nozzle interru pts the Lase r beam.At this exact mo- ment, the Z-axis position is rec…

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Student Guide SIPLACE X
Edition 09/2005 8 Collect&Place-Head 20
9
8.1.3.3 Retract unit
Retract Unit Functions
– At zero current, the bearing friction of the Z-axis is not sufficient to protect the axis from falling
down. A pneumatic retract system has been installed to protect the Z-axis should the gantry
be moved when the machine is switched off. This retract unit keeps the Z-axis in the safe, up-
per position during zero current.
Please Note: 8
The Z-axis control system is designed to ensure that, should the machine power supply fail (or be
switched off), there is always enough power temporarily stored by the Z-motor servo unit and axis
card to move the Z-axis to the upper position.
Power failure is recognized by the issuance of a „Power fail“ signal. This „Power fail“ signal
enables the relevant function (upwards movement and activation of the retract unit) on the axis
controller.
8.1.3.4 Component Sensor
The component sensor is no longer a option like the 6/12 C&P head. Also the function and position
of the component sensor is different. The component sensor is mounted directly in the placement
and pick up position, so that we recognize the component after pick up and before placement. The
Z-Axis moves downwards and upwards trough the Laser beam.
When the Laser beam is interrupted or relaesed the exactly Z-position is recording by the axis
card. So we determined in each situation if a component on the nozzle or not.
(Before Pick up: No Component on the nozzle, After Pick up: Component on the nozzle; Before
Placement: Component still on the nozzle, After placement: No Component on the nozzle)
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Retract unit
The retract unit is installed on the Z-axis and is respon-
sible for protecting the Z-axis from damage, by moving
it into a safe area in the case of unexpected events e.g.
power cuts or machine shutdown.
The retract unit is fixed with two screws and can be eas-
ily replaced during service work.
Retract unit Details
Pneumatic cylinder (1)
Solenoid valve (2)
Compressed air connection (3)
Mounting of retract unit (4)
Z-axis driver (5)
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Student Guide SIPLACE X
8 Collect&Place-Head 20 Edition 09/2005
10
Pickup Process:
– When the Z-axis moves downwards, the nozzle interrupts the Laser beam.At this exact mo-
ment, the Z-axis position is recorded and compared to the reference value, to see whether
there is still a component on the nozzle. If the Z-axis position indicates that there is a compo-
nent on the nozzle, the Z-axis will be immediately stopped. An error message will be issued
or the component will be rejected.
– When the Z-axis moves upwards again, the Laser beam is released and the Z-position re-
corded. Based on the Z-position during downwards movement, the system can now determine
the presence and height of a component.
Placement Process:
– During the placement process, the system checks whether the component is at the nozzle/
whether placement has been performed on the component.
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Component Sensor
– In its standard state, the component sensor is
installed in the pickup-placement position on
the C&P20 head.
– The sensor is fixed to the head with two
screws and can be replaced as a complete
unit during service work.
Component Sensor Details
– Power/data supply cable (1)
– Transmitter and receiver unit (2)
– LASER beam
(3)
– Mounting (4) to housing
Component
Nozzle
Recording of Z-
position when the
LASER beam is
interrupted
Downwards movement
Component
Nozzle
Upwards movement
Recording of Z-position
when the LASER beam is
free again
Component Sensor Functions
– The component sensor determines the com-
ponent and nozzle height during the place-
ment process.
– The component sensor signal is directly
linked to the measurement signal of the Z-
axis incremental encoder.
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Student Guide SIPLACE X
Edition 09/2005 8 Collect&Place-Head 20
11
8.1.3.5 Star
The mechanical collector ring consists of a stationary and a rotary part. The 6 sliding contacts
transmit direct voltage (24V/4A), ground and the CAN bus signals (CAN high, CAN low).This E/D
transmitter (Energy/Data Transmitter) can be replaced during service work.
Star carrier 03005117-0x / collector ring (E/D transmitter) 03007834-0x
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3
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4
Star axis
The star consists of the star assembly, on which all
20 DP drives are mounted, the motherboard and the
collector ring.
This complete unit is fixed to the motor shaft with
three screws and can be removed for service work
after the raceway has been dismounted.
Star Details
Motor shaft (1)
Star assembly (2)
Screws (3) mounting the star unit to the motor shaft
Smoothed distributor disc
(4)
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Star assembly
The collector ring (1) is located above the star and
supplies the DP drives
(3) with power and data.
The motherboard is located behind the control
boards
(2) of the DP drives and is responsible for
controlling and positioning the DP drives.
The control board is plugged into the mother-
board and is fixed via the two brackets
(4).
Two screws fix the complete DP drive unit from
inside, to the star frame.
An index screw
(5) ensures that the ED trans-
former is correctly positioned during assembly.